2020Ⓒ 2021 The Institute for Solid State Physics, The University of Tokyo

Activity Report
2020

Preface					

1Research Highlights		

2 - 39

Joint Research Highlights

40 - 55

Progress of Facilities		

56 - 63

Conferences and Workshops

64 - 67

Subjects of Joint Research

68 - 155

Publications

156 - 194

Preface

We would like to offer the readers the scientific activity report of theInstitute for Solid State Physics (ISSP) for the Japanese FY 2020.
ISSP was established in 1957 as a joint usage/research institute attachedto the University of Tokyo. In every era, we aim to lead the frontier of“condensed matter physics and materials science” and contribute to scienceand technology from the view of basic research. We have promoted activities
focused on research, education, and joint usage/research.
The first and second parts of the report, Research Highlights/Joint
Research Highlights, exhibit experimental and theoretical achievements incondensed matter physics and materials science. In 2020, the number ofadapted joint usage/research is 1,042 and the total number of researchers is931, which was reduced by the COVID-19 pandemic.
The third part includes the reports on progress of facilities in 2020 as follows. (1) In International MegaGauss
Science Laboratory, the pulse magnets can generate up to 87 Tesla (T) by non-destructive manner, and from 100 T up
to 1200 T, the world strongest as an in-door record, by destructive methods to promote materials science under highmagnetic field. (2) In the Supercomputer Center (SCC), the System B was replaced in October 2020, which has larger
total computational power. In Center of Computational Materials Science, the website "MateriApps" for information on application software in computational science has been constructed to support community members. (3) In
Neutron Science Laboratory, it is really good news that JRR-3 has restarted in February 2021 after long shutdown andthe normal General User Program is scheduled to come back from July 2021. The technical progress of High Resolution Chopper (HRC) spectrometer has been proceeded under high pressure and low temperature environment incooperation with KEK. (4) The Laser and Synchrotron Research (LASOR) center has 10 groups in 2020 where ISSP
has integrated the two streams, namely the extreme lasers and synchrotron radiations, into the common platform. In
Synchrotron Radiation Laboratory, operand spectroscopy is available by using lasers at Harima branch.
In the following parts, seven reports of international and domestic online conferences and workshops owing to
COVID-19 pandemic, subjects of joint research, and list of publications have been presented.
The fourth international external evaluation was held by hybrid-style from December 7 to 10, 2020 for the
proposal of the next Joint Usage/Research Center during FY2022~2027. The activities toward the current five
missions, the activities of two cross-sectional groups established after the last evaluation, and the establishment of amaterials data commons (materials data science research) and a quantum materials nanostructure laboratory as futureplans were proposed and evaluated by the international evaluation committee with important and useful comments.
All these facts confirm that ISSP continues to develop successfully and dynamically as the global center of excellence of condensed matter physics and materials science. We appreciate continuous support and cooperation ofcommunities for our activities.

July, 2021
MORI Hatsumi
Director of the Institute for Solid State Physics
The University of Tokyo

ISSP Activity Report 20201

Research Highlights
Vapochromism Induced byIntermolecular Electron Transfer Coupledwith Hydrogen-Bond Formationin Zinc Dithiolene Complex
Mori and Ozaki Groups
Reversible control of electronic functionalities ofmolecular materials using external stimuli and perturbations
is important not only for applications to next-generation
switching devices and sensors but also from the viewpointof basic science to elucidate the mechanism and to establish
the material design criteria. Recently we have demonstrated
a proton-electron coupled phenomenon in H (hydrogen)bonded π-conjugated molecular crystals [1-3], in whichmagnetism and electrical conductivity were switched byproton (deuteron) dynamics in an intermolecular H-bond.
If control of the functionalities, such as optical properties, other than magnetism and electrical conductivity bymodulating the electronic states through H-bonding is wellestablished, it will impact various research fields and greatly
expand the design criteria of functional materials. As one of
the functional molecular materials with optical properties
responsive to external stimuli, vapochromic materials, which
respond with color changes when exposed to solvent vapors,have been actively studied as good candidates for their use as
chemical sensors because they can directly visualize external
environmental changes. In this study, we focused on a novel
Zn complex, (Ph4P)2[Zn(4-mxbdt)2] (1 in Fig. 1; 4-mxbdt= 4-methoxybenzene-1,2-dithiolate) to realize the controlof vapochromic behavior by direct modulation of electronic
states through H-bonding. Based on the detailed singlecrystal structure analyses and first-principles calculations
considering intermolecular interactions using the periodic
structure model of the crystal, we disclosed a new mecha-

Fig. 1. A novel vapochromic mechanism by intermolecular electrontransfer coupled with hydrogen-bond formation was realized in azinc dithiolene complex crystals, (Ph4P)2[Zn(4-mxbdt)2] (1, left) and
1·2CH3OH (right).

2

ISSP Activity Report 2020

nism of vapochromism in 1, that is, not molecular structure
and arrangement changes but electron transfer via H-bondformation for the first time [2].
The Zn complex 1 was synthesized by complexation of zinc(II) chloride and the ligand precursor inmethanol. Yellow block-like crystals were obtained by
the slow evaporation of the crude mixture. From the
X-ray structural analysis, the yellow crystal was determined as (Ph4P)2[Zn(4-mxbdt)2]·2CH3OH (= 1·2MeOH)(Fig. 1). In this crystal, the [Zn(4-mxbdt)2] complex
showed tetrahedral coordination without a π-stacking structure because of the presence of bulky Ph4P+ cations, andthus there were no significant intermolecular interactions
between the complexes. The spaces in the loosely packed
structure were filled with two methanol molecules per
formula. These methanol molecules formed [S···H–O]
H-bonds with S atoms on the [Zn(4-mxbdt)2]2-. Interestingly,
drying the crystals overnight under vacuum induced the color
change from yellow to orange, maintaining its high crystallinity (Fig. 1).
We quantitatively evaluated the color change of eachcrystal by UV-vis absorption spectra. Visible-light absorption
edges of the orange crystal 1 and yellow crystals, 1·H2O and
1·2MeOH, were estimated to be 2.29 eV (541 nm), 2.41 eV(514 nm), and 2.45 eV (506 nm), respectively. A blue shift of
the absorption edge (0.12–0.16 eV) upon methanol or water
vapor absorption was observed, which is consistent withthe visually observed color changes. We also evaluated thephotoluminescence properties of these crystals. Significantly,
a blue shift was observed in the photoluminescence spectra(0.10–0.14 eV) for both 1·H2O and 1·2MeOH, similar to theFig. 2. (a) Crystal orbital energies of 1 and 1·2MeOH (major) and (b)corresponding crystal orbitals in 1·2MeOH (major). Crystal orbitals
from -3.2 eV to -1.3 eV (left; gray lines) are mostly on Ph4P+ cation
molecules.

UV-vis absorption spectra. The apparent color changed from
red to yellowish-orange. These experimental data demonstrate that crystal 1 is a novel vapochromic material having
both visible-light absorption and photoluminescence changes
when exposed to methanol or water sorption with reversible SCSC (single crystal-single crystal) transformations.
Remarkably, this is the first report of metal-dithiolene-based
vapochromic materials with SCSC transformations.
Then, we focused on the mechanism of vapochromismin this crystal, 1·2MeOH. DFT calculations based on theexperimentally observed crystal structures using OpenMX
software revealed the mechanism of the Fig. 2(b) H-bonding
structures in 1·2MeOH. In 1·2MeOH (major), energy gaps
for both α to γ and β to δ transitions increased (α to γ:
2.85 eV to 3.02 eV, β to δ: 2.97 eV to 2.99 eV), where the αand β orbitals were more stabilized than γ and δ (Fig. 2 (a)).
This is because of the fact that the occupied orbital groups(α and β) have a large weight on the H-bonding S atoms,
on which the largest changes in the number of electrons
were estimated by Mulliken population analysis, comparedwith the unoccupied orbital groups (γ and δ). Considering the orbital shape around the H-bond, these crystal
orbitals are derived from the hybridization of the frontier
orbitals (HOMO-1, HOMO, LUMO, and LUMO+1) of the[Zn(4-mxbdt)2]2- complex with the LUMO of the absorbed
vapor molecules at higher energies. This hybridization leads
to the above-mentioned electron transfer to stabilize both theα/β and γ/δ orbitals.
In conclusion, a novel mechanism of vapochromism
based on the intermolecular electron transfer coupled with
H-bond formation was realized in the newly obtainedzinc dithiolene complex crystal, (Ph4P)2[Zn(4-mxbdt)2]
2CH3OH. According to the mechanism proposed in thisstudy, molecules in which molecular orbitals for visible-lightabsorption are significantly distributed to H-bonding parts
can be promising candidates for a new class of vapochromic
materials. The findings here provide important insights to
expand the scope of molecular designs for vapochromic aswell as other stimuli-responsive materials.
References[1] S. Yokomori, A. Ueda, T. Higashino, R. Kumai, Y. Murakami, and
H. Mori, Cryst Eng Commun. 21, 2940 (2019).
[2] S. Yokomori, S. Dekura, T. Fujino, M. Kawamura, T. Ozaki, and
H. Mori, J. Mater. Chem. C. 8, 14939 (2020).
[3] S. Yokomori, S. Dekura, A. Ueda, R. Kumai, Y. Murakami, and
H. Mori, J. Mater. Chem. (to be published).

as a nonlinear transport phenomenon in the non-equilibrium
state carrying finite electric current.
In this study, we predicted the nonlinear AHE in alayered organic conductor α-(BEDT-TTF)2I3, and confirmed
it experimentally. This is the first example of topologicaltransport phenomena in organic conductors. We focusedon the "weak" charge ordering (CO) state in α-(BEDTTTF)2I3, where the inversion symmetry is broken. This
compound exhibits a phase transition to a CO insulator at
135 K at ambient pressure. This CO transition is suppressedby pressure, and a two-dimensional (2D) massless Diracfermion (DF) state appears above the critical pressure Pc ~1.3 GPa. The CO state just below Pc is called the weak CO
state.
First, we experimentally established the fact that the
weak CO state is a 2D massive DF state with a pair of tilted
gapped Dirac cones [1]. We used the temperature-dependent
peak structure of the interlayer magnetoresistance, which ispeculiar to the layered DF system. The magnetic field dependence of the peak temperature observed in the weak CO stateis explained only by the massive DF with a finite gap. Therefore, a finite Berry curvature appears in the weak CO state.
Next, we investigated the nonlinear AHE in the currentcarrying state in the 2D massive DF system [2]. Under thetime reversal symmetry, the sum of Berry curvature over
occupied states is canceled out between the Kramers pair of
Dirac cones, resulting in no AHE in the equilibrium state.
However, if the Dirac cones are tilting, this Berry curvature balance is broken between the Dirac cone pair in thecurrent-carrying state with non-equilibrium distribution. It
revives finite AHE as the current-induced nonlinear AHE.
The efficiency for the appearance of this current-induced
phenomenon is represented by the Berry curvature dipole(BCD) of the system. We demonstrated the anisotropy andrectification characteristics (non-reciprocity) of the nonlinear
AHE in the 2D tilted massive DF system. The generated Hall
current exhibits unidirectionality even under an external AC
field. Furthermore, we quantitatively estimated the nonlinear
AHE expected in the weak CO state in α-(BEDT-TTF)2I3,
and concluded that it is within the measurable range.
In real α-(BEDT-TTF)2I3, there may exist two types of

Authors
S. Yokomori, S. Dekura, T. Fujino, M. Kawamura, T. Ozaki, and H.
MoriNonlinear Anomalous Hall Effect inOrganic Massive Dirac Fermion System
Osada Group
When an electron system has a conduction band with afinite Berry curvature and no time reversal symmetry, it may
exhibit the intrinsic anomalous Hall effect (AHE) even atzero magnetic field. This topologically nontrivial transportphenomena disappears in equilibrium state of the systemwith time reversal symmetry. However, the AHE may revive

Fig. 1. Current-carrying state in the 2D massive DF system with tilted
Dirac cones around (a) k0 and (b) -k0. Lower panels depict the band
dispersion and upper panels illustrate the Berry curvature (contours)
and the Fermi surface of the conduction band. The hatched region
indicates occupied states in the current-carrying state. (c) Schematicof the nonlinear AHE. The balance of average anomalous velocity ofelectrons around k0 and -k0 is broken (dashed arrows) in the currentcarrying state.

ISSP Activity Report 20203

Fig. 2. (a) Dependence of anomalous Hall current j(2) on the electricfield direction θ in the current-carrying state. (b) Nonlinear AHE
observed in the weak CO state in α-(BEDT-TTF)2I3. It shows the rectifying characteristics, that is, the same Hall voltage against reversed
current.

CO domains, which cancel the nonlinear AHE under current.
So, we proposed the "current-field-cooling" technique, formacroscopic emergence of nonlinear AHE [2]. It utilizes
the current-induced orbital magnetization (orbital Edelsteineffect) to enhance the formation of single type of CO
domains.
Finally, we attempted an experimental confirmationof the nonlinear AHE in the weak CO state in α-(BEDTTTF)2I3. We performed transport measurements in the weak
CO state at 1.25 GPa and 4.2 K, and extracted the nonlinear
signal from current-reversed data. We successfully observed
nonlinear AHE with estimated order and rectifying characteristics only below the CO transition temperature [3].

kagomé structure suppresses the magnetic order down to
TN = 4 K, realizing a spin liquid state in a wide temperature
range TN < T < J ⁄ kB.
We find clear thermal Hall signals in the spin liquid
phase in all samples. The thermal Hall conductivity (κxy)
is larger in a higher-quality sample with a larger longitudinal thermal conductivity (κxx), whereas the temperature dependence of κxy is similar (Fig. 1(a)). At 15 T,κxy and κxx are found to show a peak at almost the same
temperature, a telltale sign of a phonon contribution κ phxy
in κxy at high fields. In addition, we find that the fielddependence of κxy turns to be nonlinear at low temperatures and at low fields (Fig. 1(b)), concomitantly withthe appearance of the field suppression of κxx, indicatingsp
the presence of a spin contribution κ xyin κ xy at low
spfields. This is the first observation of both κ phxy and κ xy in thesame magnetic insulator.
sp
Remarkably, by assembling the κxx dependence of κ xy
data of other kagome antiferromagnets, we find that, whereasspκ xy
stays a constant in the low-κxx region (the “intrinsic” linespin Fig. 2), κ xy
starts to increase as κxx does in the high-κxx
region (the “extrinsic” line in Fig. 2). This κxx dependence
bears similarity to that of the anomalous Hall effect inferromagnetic metals; the intrinsic mechanism by the Berrycurvature is dominant in a moderate dirty metal, whereas theextrinsic mechanism by skew scatterings is dominant for a
superclean metal. This good analogy indicates the presence

References[1] K. Yoshimura, M. Sato, and T. Osada, J. Phys. Soc. Jpn. 90, 033701(2021).
[2] T. Osada and A. Kiswandhi, J. Phys. Soc. Jpn. 89, 103701 (2020);
ibid. 128002 (2020).
[3] A. Kiswandhi and T. Osada, arXiv: 2103.00300.
Authors
T. Osada, A. Kiswandhi, K. Yoshimura, M. Sato, K. Uchida, andT. Taen

Thermal Hall Effects of Spins andPhonons in Kagome Antiferromagnet
Cd-Kapellasite
Yamashita, Hiroi, Kawashima,and Sakakibara Groups
The trajectory of an electron bends as it moves througha magnetic field. This Hall effect has been thought to notappear in insulators because of the apparent absence ofmobile electrons. But recent reports of a thermal version ofthis effect, known as the thermal Hall effect, in numerous
insulators has led to broad attention from researchers tounderstand its origin as well as potential applications forthermal current control.
Thermal current in an insulator is carried by spins
and phonons. This leads us to ask how these charge
neutral carriers can be bent by magnetic fields and how
one can separate these two effects. To clarify the issue,
we investigate the magnetic insulator Cd-kapellasite
CdCu 3(OH) 6(NO 3) 2, a kagomé antiferromagnet [1]. In
Cd-kapellasite, Cu2+ ions form a kagomé structure with adominant nearest-neighbor antiferromagnetic interaction
J ⁄ kB = 45 K. The geometrical frustration effect of the

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ISSP Activity Report 2020

Fig. 1. (a) The temperature dependence of the thermal Hall conductivityof Cd-kapellasite of different samples at 15 T [1]. All the samples show
a peak at the same temperature, but with different magnitudes. (b) The
field dependence of κxy at different temperatures. The non-linear part(colored region) shows the spin contribution.

Fig. 2. The dependence of the spin thermal Hall conductivity per the 2D
sp,2D
kagomé layer (κ xy) on the longitudinal thermal conductivity (κxx) of
Cd-kapellasite [1], Volborthite [2], and Ca-kapellasite [3]. The blue andpink dashed lines are guides to the eye for the intrinsic and extrinsic
contributions, respectively.

of a similar duality of intrinsic-extrinsic mechanisms for the
spin thermal Hall effect of an insulator.
sp
Furthermore, we find that both κ phxy and κ xy disappear in
the antiferromagnetic ordered phase at low fields, showingthat phonons alone do not exhibit the thermal Hall effect. A
high field above approximately 7 T induces κ phxy, concomitantly with a field-induced increase of κxx and the specificheat, suggesting a coupling of the phonons to the fieldinduced spin excitations as the origin of κ phxy.

point fluctuation not to allow the spins to order. While thepresence of a finite linear residual thermal conductivity,
κ0 ∕ T ≡ κ ∕ T (T → 0) has been shown [2], recent experiments [3, 4, 5] have reported the absence of κ0 ∕ T in somesamples. (Fig. 1). However, in the experiments reporting theabsence of κ0 ∕ T, the phonon thermal conductivity is strongly
suppressed [3]. In sharp contrast, a large phonon thermal
conductivity with a phonon mean free path reaching almost
the boundary limit is observed in the experiments showing
the presence of the κ0 ∕ T. Therefore, it is not clear if theabsence of κ0 ∕ T shows absence of the gapless spin excitations or if the gapless spin excitations are simply suppressed
when the phonons are strongly scattered.
Here we show that both the magnitude of the phonon
thermal conductivity and the presence/absence of κ0 ∕ Tstrongly depend on the cooling process of the sample. Whencooling down very slowly, a sizable κ0 ∕ T is observed. In
contrast, when cooling down rapidly, κ0 ∕ T vanishes and,in addition, the phonon thermal conductivity is strongly
suppressed. These results suggest that possible random
scatterers introduced during the cooling process are responsible for the apparent discrepancy of the thermal conductivity data in this organic system. The present results provide
evidence that the true ground state of EtMe3Sb[Pd(dmit)2]2
is likely to be a quantum spin liquid with itinerant gaplessexcitations.

References[1] M. Akazawa et al., Phys. Rev. X 10, 041059 (2020).
[2] D. Watanabe et al., Proc. Natl. Acad. Sci. USA 113, 8653 (2016).
[3] H. Doki, M. Akazawa, H.-Y. Lee et al., Phys. Rev. Lett. 121,
097203 (2018).
Authors
M. Akazawa, M. Shimozawaa, S. Kittakab, T. Sakakibara, R. Okuma,
Z. Hiroi, H.-Y. Leec, N. Kawashima, J. H. Hand, M. Yamashita
aOsaka University
bChuo University
cKorea University
dSungkyunkwan University

Presence and Absence of Itinerant Gapless
Excitations in the Quantum Spin Liquid
Candidate EtMe3Sb[Pd(dmit)2]2
Yamashita GroupThe presence or absence of itinerant gapless excitations in the organic quantum spin liquid (QSL) candidate
EtMe3Sb[Pd(dmit)2]2, probed by a finite residual linear
term in the thermal conductivity κ0 ∕ T ≡ κ ∕ T (T → 0), hasbeen controversial hot topic. We find that κ0 ∕ T strongly
depends on the cooling process. A finite κ0 ∕ T is observed ina slow-cooled sample, but not in a rapid-cooled sample [1].
These results provide evidence that the true ground state of
EtMe3Sb[Pd(dmit)2]2 is a QSL with itinerant gapless excitations.
The organic Mott insulator EtMe 3 Sb[Pd(dmit) 2 ] 2
possesses a nearly isotropic triangular lattice of localized
spin-1/2 on the Pd(dmit)2 dimers. This geometrical frustration effect caused by the triangular lattice and a proximity
effect of the Mott transition are believed to enhance the zero-Fig. 1. Temperature dependence of the thermal conductivity divided
by the temperature of EtMe3Sb[Pd(dmit)2]2. The data of the previous
reports [2, 3] are also plotted.

Fig. 2. Low-temperature data of κ ⁄ T plotted as a function of T. The
dashed lines show an extrapolation of the data.

ISSP Activity Report 20205

References[1] M. Yamashita et al., Phys. Rev. B 101, 140407(R) (2020) * Editor’ssuggestion.
[2] M. Yamashita et al., Science 328, 1246 (2010).
[3] M. Yamashita, J. Phys. Soc. Jpn. 88, 083702 (2019).
[4] P. Bourgeois-Hope et al., Phys. Rev. X 9, 041051 (2019)[5] J. M. Ni et al., Phys. Rev. Lett. 123, 247204 (2019).
Authors
M. Yamashita, Y. Satoa, T. Tominagaa, Y. Kasaharaa, S. Kasaharaa,
H. Cuib, R. Katob, T. Shibauchic, and Y. Matsudaa
aKyoto University
bRIKENcThe University of Tokyo

Sample Dependence of the Half-Integer
Quantized thermal Hall Effectin a Kitaev Candidate α-RuCl3
Yamashita and Uwatoko Groups
Non-trivial topology in a condensed-matter state realizes
a quantization of a physical quantity. One of the most fundamental examples is the quantized Hall conductivity in aquantum Hall system, where the quantized Hall conductivity
is given by the Chern number determined by the topology ofthe system.
A new intriguing case of this topological quantization
is now found in a magnetic insulator, a Kitaev magnet.
In the Kitaev model, localized spin-1/2 moments on a
two-dimensional (2D) honeycomb structure are coupled eachother by bond-dependent Ising interactions. The frustration

Fig. 1. (a) A setup picture of the thermal conductivity (κxx) and thethermal Hall (κxy) of α-RuCl3 (sample A). The sample was tilted to thebase plate so that the magnetic field oriented to 45 degree to the c axis.
(b) The temperature dependence of κxx of different samples (A, B, andC) at zero field.

6

ISSP Activity Report 2020

Fig. 2. The in-plane field dependence of κxy ⁄ T of all the samples. The
dotted lines show the value corresponding to the half-integer quantized2
thermal Hall effect κ2D
xy / T = qt C / 2, where qt = (π ⁄ 6) k B / ħ . The sign ofκxy of sample A is inverted for a clarity.

effect of this Kitaev Hamiltonian prevents the spins fromordering even at the zero temperature, realizing a quantum
spin liquid state. Remarkably, this ground state of the Kitaev
Hamiltonian is exactly solvable. The ground state has beenshown to be characterized by the two kinds of elementary
excitations; itinerant Majorana fermions and localized Z2
fluxes. In a magnetic field, this itinerant Majorana fermions
have topologically non-trivial gapped bands with the Chern
number C = ±1, giving rise to a quantized chiral edge current
protected by the field-induced gap. In contrast to a quantizedchiral edge current of electrons in a quantum Hall system,
this chiral edge current is carried by the charge neutral
Majorana fermions. Therefore, this quantized chiral edge
current has been predicted to appear in the 2D thermal Hall
2
conductivity as κ2D
xy / T = qt C / 2, where qt = (π ⁄ 6) k B / ħ .
In this work [1], we reveal that it is necessary to protect
the chiral edge current from severe scattering effects onphonons to stabilize the quantized thermal current. We investigate the sample dependence of the longitudinal (κxx) andtransverse (κxy) thermal conductivity of three single crystalsof α-RuCl3 – a promising candidate realizing the Kitaev spin
liquid [2]. We find the half-integer quantized thermal Hall
effect in a sample showing the largest κxx among the three
crystals (sample A in Fig. 1). On the other hand, the othersamples with smaller κxx show κxy much smaller than thevalue expected for the quantization (Fig. 2). Given that κxx ismostly given by phonons, the different magnitudes of κxx indifferent samples reflect the different scattering strengths onphonons; phonons in a sample with smaller κxx are exposedin stronger scattering effects. Therefore, the dependence ofκxy on κxx shows that the chiral edge current in the Kitaev
magnet is sensitive to scattering effects on phonons.
Further, we find that a sample with a larger κxx showsa larger decrease of the magnetic susceptibility below the
Néel temperature, in addition to a larger field-increase effectof κxx, showing that magnetic scattering effects are morestrongly suppressed by magnetic fields in a sample with abetter quality. These results suggest that suppressing thismagnetic scattering effect plays an important role to realize
the quantized thermal Hall effect.
References[1] M. Yamashita et al., Phys. Rev. B 102, 220404(R) (2020).
[2] Y. Kasahara et al., Nature 559, 227 (2018).

Authors
M. Yamashita, J. Gouchi, Y. Uwatoko, N. Kuritaa, and H. Tanakaa
aTokyo Institute of Technology

Ultralow Temperature NMR of CeCoIn5
Yamashita and Takigawa Groups
We have established the experimental procedures tomeasure high-field spin-echo NMR signals down to ultralow
temperatures (~1 mK) with ensuring the thermal equilibrium
between the sample and the cryostat [1]. This techniqueallows us to observe a peak in 1 ∕ T1T of 59Co NMR signals
at ~20 mK, showing a magnetic transition in CeCoIn5.
Understanding the role of enhanced quantum fluctuations near a magnetic quantum critical point (QCP) has
been a central issue in condensed-matter physics, becausesuch quantum fluctuations are believed to mediate various
exotic phenomena, such as non-Fermi liquid behaviors,
enhancements of effective mass, and unconventional Cooper
pairings. Many studies of unconventional superconductivity
near a magnetic QCP have been performed in heavy-fermion
materials. Among the various heavy-fermion materials,
CeCoIn5 has been attracting broad attention because ofits d-wave superconducting state with the high transition temperature of 2.3 K and the proximity to a putative
magnetic QCP. However, no antiferromagnetic (AFM) statecorresponding to the QCP has been observed, shrouding theorigin of the QCP in mystery.
Recently, we have reported anomalous decrease in thede Haas–van Alphen (dHvA) amplitudes of CeCoIn5 below
20 mK for 6–10 T [2]. An appearance of a field-induced
AFM phase has been put forward to explain the decreaseof the dHvA amplitude, because additional dissipation by

Fig. 2. The temperature dependence of 1 ∕ T1T at 5 T. The data of theprevious report [3] is also plotted. The dashed line shows a guide to theeyes.

magnetic breakdowns in the AFM phase can provide themost plausible explanation for the decrease of the dHvA
amplitude. However, direct evidence of magnetic order has
yet to be observed.
In this work, we performed spin-echo NMR measurements down to 5 mK to find the magnetic order. It is a very
challenging issue to observe NMR signals down to ultralow
temperatures without heating the sample. First, we madea strong thermal connection between the sample and thecryostat by indium soldering a silver wire to the sample(Fig. 1). Second, we find that the temperature dependence ofthe spin-echo intensity ISE ( T ) provides a good measure of
the sample temperature. By taking into account the population difference of the nuclear spins in different energy levels
which have the Boltzmann distribution, one can find thetemperature dependence of ISE ( T ) as shown by the solidline in Fig. 1d. We confirm that the NMR signal follows
the Boltzmann curve when the heating caused by the NMR
pulses is negligible (Fig. 1d), allowing us to find a pulse
condition without heating the sample.
Having established the NMR pulse conditions without
heating of the sample, we investigate the temperature dependence of the longitudinal relaxation time (T1). We find apronounced peak in 1 ∕ T1T at 5 T, implying an appearance ofmagnetic order as suggested by our previous dHvA measurements [2]. On the other hand, the NMR spectrum shows nochange below 20 mK. Moreover, the peak in 1 ∕ T1T disappears at 6 and 8 T in contrast to the results of the quantum
oscillation. We discuss that an antiferromagnetic state witha moment lying in the a–b plane can be a possible origin forthe peak in 1 ∕ T1T at 5 T.
References[1] M. Yamashita et al., Phys. Rev. B 102, 165154 (2020).
[2] H. Shishido et al., Phys. Rev. Lett. 120, 177201 (2018).
[3] T. Taniguchi et al., JPS Conf. Proc. 30, 011107 (2020).

Fig. 1. (a) A picture of the sample with a silver wire (100 μm diameter)soldered by indium. (b) Cu wires were wound around the sample for
NMR measurements. The silver wire was thermally anchored to thecryostat. (c) Crystal structure of CeCoIn5. NMR measurements were
performed at 59Co (I = 7 ∕ 2) nuclei. (d) The temperature dependence ofthe spin-echo intensity at 8 T. The solid line shows the calculation fromthe Boltzmann distribution of the nuclear spins.

Authors
M. Yamashita, M. Tashiro, K. Saiki, S. Yamada, M. Akazawa,
M. Shimozawaa, T. Taniguchib, H. Takeda, M. Takigawa, and H.
Shishidoc
aOsaka University
bIMR, Tohoku University
cOsaka Prefecture University

ISSP Activity Report 20207

Dynamics of Composite Domain Walls
in Multiferroics FeGdO3
Tsunetsugu Group
Domain Walls (DW) are topological defects withmesoscopic size and understanding their dynamics is important for both experimental and theoretical interests. We havetheoretically studied the steady state dynamics of DW driven
by magnetic field in a system with multiple orders coexist[1].
Our target system is the multiferroic compound FeGdO3
and its low-temperature phase is characterized by three orderparameters: antiferromagnetic moments of Fe spins N withbiaxial anisotropy and isotropic Gd spins n and one component of electric polarization P. Their coupling cN∙nP leads
to composite DWs, i.e. two order parameters need to flip
together in each DW, and therefore there exist 3 different
types of composite DWs: N-n, N-P, and n-P.
We have studied the dynamics of these composite DWs
driven by magnetic field based on the phenomenologicaltime-dependent Ginzburg-Landau theory. Neglecting fluctuations inside the DW, we have investigated by numericalcalculations the time evolution of their one-dimensionalmotion. With the help of anisotropic exchange couplings,
the applied magnetic field couples to N and thus drives
N-P and N-n DWs. One important finding is the difference between these two types in the scaling of DW
steady state velocity υ(c,H). In its weak field expansion
υ(c,H) = α(c2)H+β(c2)H3+…, the coefficients exhibit a
singularity at c = 0 for N-n DW, and this is related to n’s
internal isotropy.
As a big surprise, it turns out that a composite DW

Fig. 1. Velocity of composite DWs driven by magnetic field expandedin H. α is the linear mobility. c is the interaction strength.

Fig. 2. Stability phase diagram of composite DWs driven by magnetic
field H. B: N-n DW is unstable, C: N-P DW is unstable, A: both DWs
are stable.

8

ISSP Activity Report 2020

becomes unstable in strong magnetic field and splits into apair of different types: N-P → N-n + n-P and N-n → N-P+ n-P. In both cases, n-P DW is immobile but its partner
succeeds to the moving part after splitting. The possibilityof this type of splitting was pointed out as an impurity
effect [2], but we have found that it may occur in a purebulk as a dynamical instability. An important point is thatthe non-flipping component is also dragged by the flipping
ones due to the coupling c-term. With increasing the driving
field, its modulation grows and finally creates a pair of kink
and anti-kink, which is DW splitting. This type of dynamical
instability may appear, in principle, in any systems withmore than two types of order parameters. It is an interesting challenge to observe in experiments this splitting ofcomposite DW.
References[1] K. Kawahara and H. Tsunetsugu, J. Phys. Soc. Jpn. 90, 014703(2021).
[2] Y. Tokunaga et al., Nat. Mater. 8, 558 (2009).
Authors
H. Tsunetsugu, K. Kawahara

Fermi-Liquid Correction in Current Noisethrough a Correlated Quantum Dot
Kato Group
Artificially generating, controlling, and measuring
quantum states on semiconductor substrates is the key torealizing quantum information technology, such as quantum
computers and quantum communications. On the other hand,the development of technologies to generate and control
artificial quantum states has brought about a paradigm shift
in material science. As a result, it has become possible tothoroughly explore the physical phenomena that give rise to
nontrivial features of matter by artificially reproducing thequantum states in matter, rather than simply investigating
the properties of natural matter as has been done in the past.
Furthermore, through advanced control technology, it has
become possible to precisely investigate the behavior ofquantum many-body states in complex environments, suchas nonequilibrium states, which were previously not easy toaccess.
Along with superconductivity and the quantum Hall
effect, the Kondo effect is one of the fundamental manybody effects of electrons. The primary mechanism of
the Kondo effect was elucidated in 1964 and has beenthoroughly investigated since then. The Kondo effect occurs
not only in dilute magnetic materials, where the phenomenon
was originally discovered, but also in a variety of physicalsystems. Recently, many studies on the Kondo effect havebeen carried out in various physical fields, such as condensed
states of light-trapped cooled atoms and quarks. However,
the actual state of these systems often deviates from the ideal
state assumed in the mathematical analysis. In other words,
it is known that the symmetries possessed by physical states(time-reversal symmetry and particle-hole symmetry) arebroken and play a significant role in the low energy states.
However, the correction on the local-Fermi-liquid statebeyond the linear response had remained a difficult problem
until recently [1].
Consider a situation in which electrons are confinedin a quantum dot, which is a device of several tens ofRecently, our collaborators have succeeded in an experiment to verify the local-Fermi-liquid correction effect using
current measurement on a carbon nanotube-based quantum
dot [3].
As described so far, the results of this research are fundamental to the physics of condensed matter. However, it isexpected that they will lead to the development of materials
science and quantum information technology.
References[1] C. Mora, C. P. Moca, J. von Delft, and G. Zarand, Phys. Rev. B 92,
075120 (2015).
[2] Y. Teratani, R. Sakano, and A. Oguri, Phys. Rev. Lett. 125, 216801(2020).
[3] T. Hata, Y. Teratani, T. Arakawa, S. Lee, M. Ferrier, R. Deblock, R.
Sakano, A. Oguri, and K. Kobayashi, Nat. Commun. 12, 3233 (2021).
Fig. 1. Bias-voltage nonlinear coefficient of current noise
as afunction of magnetic field B normalized by the Kondo energy scale(Kondo temperature) TK for several choices of the Coulomb interaction U ∕ (πΔ) is plotted. Here the current noise is given in the form

Authors
R. Sakano, Y. Teratania, and A. Oguria

aOsaka city university. It is found that all the data
points are on a universal curve.

nanometers in size made of a semiconductor or othermaterial. In a quantum dot made of carbon nanotubes, forexample, the shape of the electron confinement region ishighly symmetric. As a result, in addition to the spin of theelectrons, a magnetic moment is generated in the quantum
dot due to the orbit of the electron motion. By attaching
electrodes to this quantum dot, the number of confinedelectrons can be tuned, and the local-Fermi-liquid state canbe controlled in a state of broken electron-hole symmetry.
Using quantum field theory and mathematical methods, wehave clarified that the local-Fermi-liquid corrections, which
are caused by the three-electron correlation, play an essential
role in the correlated quantum dot beyond the conventional
theory on the local Fermi liquid. This three-electron correlation is particularly pronounced in quantum dots with multiple
orbitals. For example, in the Kondo effect caused by electron
spin alone, it is difficult to observe the local-Fermi-liquid
corrections because the Kondo effect itself disappears when
the number of electrons is changed.
Exploiting numerical simulations and field theory
techniques, we have clarified that the local-Fermi-liquid
corrections can be observed in actual experiments based on
the transport quantities such as nonlinear current, current
noise, and thermal conductivity [2]. We have also found that
there is a scaling universality in the nonlinear current noise
behavior when a magnetic field is applied to a quantum
dot. Application of magnetic field breaks the time-reversal
symmetry of the quantum dot and gives rise to the localFermi-liquid corrections in nonlinear transport quantities. It
is also found that the local-Fermi-liquid corrections have auniversal scaling property independent of the details of thenanoscale materials, similar to the conventional local-Fermiliquid (see Figure).
This research has significantly advanced our understanding of the physical mechanisms that give materials
their nontrivial features through the interaction of electrons.
The Kondo effect is the most fundamental quantum manybody effect, and it appears in the properties of various
materials. Therefore, it is expected to be helpful in designing
new materials and exploring new materials in the future. In
addition, the study of artificially controlled quantum manybody states in nanoscale materials requires highly sensitive
observation techniques, which will contribute to the development of technologies to generate and control quantum states.

Sub-Atomic Lattice Distortionof an Atomic Layer Compound
Visualized by Moiré Pattern
Komori Group
Chemical and physical properties are greatly affectedby lattice distortion through the change of the electronic
structures. At solid surfaces, the local distortion induced by
the adsorbates, subsurface impurities and hetero-interface
modify reactivity, growth and other atomic processes. By
mapping the amplitude and direction of the local distortion,
we can elucidate the details of the atom processes including
surface reactivity. However, it has been technically difficult
to observe the local distortion directly using microscopy
methods. While scanning tunneling microscopy (STM) withatomic resolution is one of the ideal tools for studying the
local structure, its lateral resolution is still insufficient tomeasure the distortion of the order of a few % of the lattice
constant [1]. One of the ways to improve the lateral resolution is a use of the moiré pattern in the STM images [2]. In
the present study, we demonstrate that the local lattice distortion of a hexagonal iron-nitride monatomic film grown overa flat and wide Cu terrace can be visualized by analyzing the
moiré pattern. [3]Fig. 1. (a,b) Topographic STM images of the hexagonal iron-nitride
monolayer on Cu(111). Cyan line in (a) is drawn along the moiré
pattern. The lattice orientation of the iron-nitride monolayer is indicatedby green circles in (a). The red circle in (a) indicates the point protrusion. (c) Schematic model of the hexagonal iron-nitride monolayer on
Cu(111). Green, blue and orange balls indicate Fe, N and Cu atoms,
respectively. The Cu(111) lattice is rotated by 0.28° from the ironnitride lattice. (d) Moiré pattern between the hexagonal iron-nitride
monolayer and Cu(111) obtained by the schematic model in (c). Cyan
rhombuses in (b), (c) and (d) show the unit cell of the moiré pattern [3].

ISSP Activity Report 20209

protrusions are preferentially formed in the regions withlarge lattice distortion of the iron nitride monolayer.
References[1] S. Ohno et al., Surf. Sci. 554, 183 (2004).
[2] M. Ritter et al., Phys. Rev. B 57, 7240 (1998).
[3] T. Hattori et al., Nano Lett. 21, 2406 (2021).
Authors
T. Hattori, N. Kawamura,T. Miyamachi, and F. Komori

Steps as a Disorder on
Atomic-Layer Superconductors
Hasegawa Group

Fig. 2 (a) Two-dimensional histogram of the displacement of the moiré
pattern center and the distance from the center to the nearest point
protrusion. (b) Proposed schematic model of the point protrusion. (c−e)
Histograms of the distance from the centers to the nearest point protrusions for three regions of the displacement 0- 25 pm in (c), 25−50 pmin (d), and 50−75 pm in (e). The counts are normalized by the total
counts in each region [3].

Observed topographic STM images of the surface areshown in Fig. 1(a. b). A uniform iron-nitride film grows
over the Cu(111) terrace larger than 100 × 100 nm2, and ahexagonal moiré pattern with the periodicity of ~ 1.3 nm canbe seen in the images. The green circles in Fig. 1(a) show
the positions of the surface atoms along the [101] direction,and the cyan line is plotted along the moiré pattern. The
latter is tilted from the lattice orientation of the hexagonaliron nitride monolayer by 1.1 ± 0.1°. A schematic modelof the iron nitride monolayer on Cu(111) is displayed inFig. 1(c). We assume that Fe atoms are observed as protrusions by STM. This model can reproduce the overall characteristics of the moiré pattern in the image including the 1.1°
tilt as in Fig. 1(d). In the STM images, we notice larger andhigher protrusions, which randomly distribute on the surface,than the atomic protrusions as indicated by the red circle inFig. 1(a). We call them point protrusions.
A detailed analysis of the moiré pattern reveals that thecenter of the moiré pattern does not form a regular periodic
lattice. The center positions randomly fluctuate from ahypothetical regular lattice points. Figure 2(a) shows a twodimensional histogram of the displacement of the moiré
pattern center from the lattice point and the distance fromthe center of the moiré pattern to the nearest point protrusion. Our structural model of the point protrusion is given
in Fig. 2(b). The histograms of the distance from the centersto the nearest point protrusions are made depending on
the displacement to see the correlation more clearly as inFig. 4(c−e). For the centers with a large displacement, thedistance to the nearest point protrusion is relatively shortcompared to those with a small displacement. The point

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ISSP Activity Report 2020

Two-dimensional (2D) superconductors, whose thickness is thinner than the coherence length, exhibit peculiar
properties. Compared with bulk superconductors, 2D superconductors are susceptible to disorder since induced electron
localization enhances repulsive electron-electron interaction, which suppresses the Cooper pairing. As demonstrated
with thickness-dependent critical temperature of amorphous
superconducting thin films, changing parameters such as
disorder, thickness, and perpendicular magnetic field lead toa superconductor-insulator transition (SIT). The zero-temperature transition is one of the typical examples of quantum
phase transitions, and has been investigated extensively toelucidate its universal properties.
Recent technical advancements have allowed us to fabricate highly crystalline 2D superconductors, some of which
has only mono-atomic layer thickness. In the case of suchhighly-ordered 2D superconductors it has been reported thatduring the SIT induced by the magnetic field application
metallic phase appears in between. So far, the properties ofthis peculiar quantum metallic phase have been investigatedmainly by transport measurements but the mechanism is still
controversial. In order to understand its details atomistic
real-space measurements are crucial. In the present study,
we studied superconducting properties of striped-incommensurate (SIC) phase of the Pb/Si(111) system; one of themonoatomic-layer superconductors, formed on vicinal Si
substrates. Since the substrate is tilted, uniformly distributed
steps, whose spacing is equivalent or even smaller than thecoherence length, should behave as a dispersed disorder on
the ultimately thin superconductor. We investigated how thesteps affect the superconducting properties and the magnetically induced SIT by using low-temperature scanningtunneling microscopy (STM).

Fig. 1. (left) 3D-rendered STM image of striped incommensurate (SIC)
phase of Pb/Si(111) system formed on a 1.1°-tilted vicinal substrate.
(right) tunneling spectrum taken on a terrace of vicinal SIC phase taken
at 0.36 K showing a superconducting gap of 0.30 meV.

Carrier Density Control
in Oxide Quantum Wells
Lippmaa group
Fig. 2. STM image of the vicinal SIC superconducting phase andzero-bias-voltage maps, which correspond to the spatial distribution of
the density of states (DOS) at the Fermi level, taken under the perpendicular magnetic field of 120, 210, 300, and 400 mT.

Figure 1 shows a 3D-rendered STM image of the SIC
phase formed on a 1.1°-tilted vicinal Si(111) substrate taken
at 0.36 K. A characteristic SIC stripe pattern can be seemon the terraces. In the image, the vertical scale is severely
exaggerated; the step height corresponds to 0.31 nm whereas
the averaged terrace width is 16 nm. A tunneling spectrum
taken on a terrace shows a superconducting gap that canbe well fitted with the Dynes function. The fitted superconducting gap, 0.30 meV, is almost same as that taken on
SIC phase formed on a flat substrate, indicating the Cooper
pairing is not affected by the presence of the steps.
In our previous studies on the role of steps on superconductivity, we found that the steps basically behave asa Josephson junction connecting the neighboring terraces,
and the strength of the decoupling strongly depends on thephases [1, 2]. Among the Pb monolayer phases, the steps of− −the √ 3 × √ 43 phase decouple terraces significantly to makethe terraces superconducting nano stripes [2]. On the other
hand, the decoupling of the SIC phase is rather weak sothat vortices are just pinned at step edges. In the case of thevicinal one, as the terrace width (16 nm) is much shorter thanthe coherence length of the flat one (38 nm), more than one
steps are involved on the formation of a vortex.
Figure 2 shows an STM image and zero-bias-voltage
maps, which correspond to the spatial distribution of thedensity of states (DOS) at the Fermi level, taken undervarious magnetic fields. At 120 mT, the vortices are observed
elongated along the step direction. The DOS at the coreof the vortices is not fully recovered to that of the normal
metal. These are the characteristic features of an AbrikosovJosephson vortex. The oval shape of the vortices is due to the
reduced coherence length along the step-crossing direction
caused by the limited mean free path due to the presenceof the steps. Because of the reduced coherence length, thecritical magnetic field, which is inversely proportional to thecoherence length, is enhanced on the vicinal superconductor.
At the magnetic field of 210 mT, the number of vortices
increases as well as the background DOS. The vortices are
no longer distinct, and significant corrugation in DOS isdiscernible. By further increasing the magnetic field, DOS
gradually increases and its distribution becomes homogeneous. Around 330 mT, DOS exhibits saturation, indicating
the breaking of superconductivity. According to the transportmeasurement performed on the same phase the vortex liquid
phase and quantum metallic phase are observed at thesemagnetic fields. The observed blur vortices and inhomogeneous DOS contrast presumably corresponds to thermally
activated or quantum diffusing vortex liquid phase.

Two-dimensional carrier confinement in a quantum
well at an oxide heterointerface offers new ways of controlling the transport behavior of oxide materials by appliedexternal fields. Magnetic tunability has been attributed to
Rashba-type spin-orbit coupling in an asymmetric electron
distribution, the enhancement of spin-orbit coupling close
to a filling-dependent Lifshitz transition, or a change in theeffective disorder experienced by carriers when the quantum
well width changes. Electric fields, on the other hand, can beused to change the quantum well filling, by accumulating or
depleting carriers at an interface, or to modify the width ofthe electron distribution in the depth direction.
Oxide quantum wells are usually formed by growing athin epitaxial LaAlO3 layer on SrTiO3, in which case thequantum well forms at the surface of the SrTiO3 substrate
due to, at least in part, the change of lattice polarity at theinterface. Instead of using the polar LaAlO3 layer, it is also
possible to form quantum wells by depleting oxygen fromthe surface or by delta-doping SrTiO3 with a (La,Sr)Ox
monolayer. All these techniques produce a metallic quantum
well with qualitatively similar properties, but the LaOx deltadoping technique has several advantages in allowing a broad
range of carrier densities to be explored. In contrast, thecarrier number is essentially fixed by the polarity discontinuity at LaAlO3/SrTiO3 interfaces, while oxygen-deficientsurfaces can only be maintained in ultra-high vacuum conditions.
In our recent work [1], we have studied the possibilities
of constructing oxide quantum wells based on embedded(La,Sr)Ox layers in SrTiO3. The heterostructures were grownby Pulsed Laser Deposition on SrTiO3 single crystals as
illustrated in Fig. 1. The carrier number in these heterostructures is controlled by two parameters: the number of
La atoms in the delta-doping layer, and the thickness of a
SrTiO3 capping layer. Since SrTiO3 surfaces exposed toair are strongly depleted, a space-charge layer forms in thecap layer and the thickness of the capping layer can be used
to partially deplete the carriers in from the quantum well.
Almost complete carrier depletion occurs when the capping

References[1] S. Yoshizawa et al., Phys. Rev. Lett. 113, 247004 (2014).
[2] F. Oguro et al., Phys. Rev B 103, 085416 (2021).
Authors
Y. Sato, M. Haze, S. Yoshizawaa, T. Uchihashia, and Y.Hasegawa
aNational Institute for Materials ScienceFig. 1. Formation of a quantum well in SrTiO3 around a LaTiO3 delta
doping layer. Due to surface depletion, carriers are depleted from thequantum well if the distance is small (c). Saturated metallic behavior is
obtained only for capping layers thicker than 10 nm (a).

ISSP Activity Report 202011

Sandwich Structure Formation of
BN-Covered Silicene on ZrB2/Si(111) by
Adsorption of NO and Thermal Processes
Yoshinobu Group

Fig. 2. Variation of the sheet resistance of SrTiO3/LaTiO3/SrTiO3 heterostructures with the LaTiO3 delta-doping layer thickness (a) and SrTiO3
capping layer thickness (b). Layer thicknesses are given in unit cells(4Å).

layer thickness drops below 4 nm (10 unit cells). Above 10
nm capping thickness, surface depletion no longer affects thecarrier density in the quantum well and the carrier density
is set by the number of La atoms in the delta-doping layer.
The built-in carrier density in the quantum well is thus set by
two layer thickness parameters that are easy to control with
precision in the growth process. When the heterostructures
are formed into gated field-effect transistors, additional finetuning of the carrier density over a narrow range is possible
by applying a suitable gate voltage. The electrostaticallygated heterostructure devices are thus particularly well
suited for studying filling-dependent Lifshitz transitions, i.e.
varying the Fermi energy in the quantum well across the Ti
3d conduction band dxz,yz - dxy level crossing.
The effects of the doping and capping layer thicknesseson the transport behavior of the heterostructures are shownin Fig. 2. When a thick capping layer is used and the surface
depletion effect can be ignored, metallic conductivity is
obtained from the LaOx layer coverage exceeds about 0.3
monolayers and a gradual reduction of the sheet resistanceis observed as the La coverage is increased. For a single unit
cell of LaTiO3, the quantum well carrier density was on theorder of 1013 cm-2. In all cases, however, the Hall resistance
was nonlinear, indicating that a significant depth distribution of carriers exists. Approximately 1/4 of the carriers are
distributed to a distance of 10 nm or more from the interface.
These ‘deep’ carriers do not suffer from interfacial scatteringand reach a mobility of over 104 cm2/Vs at 4K.
The built-in carrier concentration can be further adjusted
by changing the cap layer thickness, as shown in Fig. 2b.
As the cap layer thickness is reduced to 10 unit cells or less,the heterostructures become semiconducting and finallyinsulating. These experiments show that it is possible to tune
the carrier density continuously close to the lowest densities
where metallic conductivity can be sustained.

Atomic layer materials have attracted much attention inphysics, chemistry and materials science. Silicene is a siliconanalogue of graphene. A honeycomb silicene layer has been
prepared on suitable substrates such as Ag, ZrB2, Ir, ZrC
surfaces. It has been reported that a silicene layer grownon these metallic surfaces has relatively strong interaction
with the substrate because of the orbital mixing between
metal bands and Si sp-bands. Towards the functionalizationof silicene for device applications, several theoretical andexperimental investigations have been carried out concerning
the interaction between the silicene and other atoms/
molecules. Here, we investigated the adsorption and thermal
reaction processes of NO with the a silicene monolayer on
the ZrB2/Si(111) substrate using synchrotron radiation X-ray
photoelectron spectroscopy (SR-XPS) and density-functional
theory (DFT) calculations. SR-XPS experiments werecarried out at BL13 of KEK-PF.
Figure 1 shows a series of O 1s, N 1s, Si 2p and B 1s
XPS spectra of these processes. The initial surface is a clean
silicene monolayer on ZrB2/Si(111) (see each XPS for theclean surface). NO is dissociatively adsorbed on the silicene
surface at 300 K. At an early stage of NO exposure, an
atomic nitrogen is bonded to three Si atoms most probably
by a substitutional adsorption with a Si atom of silicene(N≡Si3). An atomic oxygen is inserted between two Si
atoms of the silicene (Si-O-Si). After a large amount of NO
exposure (1500 L), the two-dimensional honeycomb silicene
structure becomes destroyed judging from the decay oftypical Si 2p spectra for silicene (see Fig. 1c). The oxidation
state of Si becomes Si4+ predominantly and the XPS peaks

Reference[1] J. N. Lee, X. Hou, R. Takahashi, and M. Lippmaa, Appl. Phys.
Lett. 116, 171601 (2020).
Authors
J. Lee, X. Hou, R. Takahashia, and M. Lippmaa
aNihon University

Fig. 1. A series of XPS spectra of the 1500 L NO/silicene/ZrB2/Si(111)
surface as a function of heating temperature. (a) O 1s spectra (hn =700 eV), (b) N 1s spectra (hn = 560 eV), (c) Si 2p spectra (hn = 260eV), and (d) B 1s spectra (hn = 700 eV). After quick heating to eachtemperature, the sample was cooled down to room temperature, and
XPS measurements were carried out. Note that at 1053 K, the heating
duration time was 5 min and 25 min.

12

ISSP Activity Report 2020

Functional Characterization andStudy on the Molecular Mechanismof Ion-transporting Rhodopsins
Inoue Group

Fig. 2. (a) top view and (b) side view of the optimized structure ofa sandwich structure of a hexagonal BN sheet on the silicene/ZrB2
substrateof ZrB2 substrate are decreased in intensity, indicating thatcomplicated silicon oxinitride species have developed threedimensionally on the ZrB2/Si(111) substrate at 300 K. By
heating above 900 K, the oxide species start to desorb fromthe surface probably as SiO, but nitrogen-bonded species
still exist (Figs. 1a and 1b). After heating at 1053 K for 5
min., no oxygen species is observed on the surface (Fig. 1a);
SiN species are temporally formed as a metastable species
and BN species also start to develop (Fig.1b). In addition,
the silicene structure is partly restored on the ZrB2/Si(111)substrate (Fig. 1c).
After the prolonged annealing at 1053 K for 25 min.,the XPS spectra show a single peak at 397.5 eV for N 1s
(Fig. 1b) and an emerging peak at 190.1 eV for B 1s state(Fig. 1d). Since the B 1s peak at 190.1 eV can be ascribed to
the B atom in the hexagonal BN structure according to thereference XPS spectra of BN, we conclude that the hexagonal BN structure has developed on the silicene on ZrB2.
By DFT calculations, the geometrical structure has been
optimized as shown in Fig. 2; a hexagonal BN sheet weaklyinteracts with the silicene layer on the ZrB2 substrate. The
calculated binding energy of the N 1s state in the hexagonal
BN is 397. 61 eV on average, while there is a variation of
the binding energies depending on the relative position of
N atoms with respect to the Si atoms of silicene, and theminimum and maximum binding energies are 397.41 and
397.81 eV, respectively. The good agreement between theexperimental and calculated binding energies supports theformation of the hexagonal BN structure after the prolonged
annealing at 1053 K. Thus, the sandwich structure of
BN-covered silicene on the ZrB2/Si(111) substrate is formedby adsorption of NO at 300 K and prolonged heating at
1053 K.

Rhodopsin is photo-receptive heptahelical transmembrane protein in which a retinal chromophore is covalently
bound to a conserved lysine residue in the seventh transmembrane helix (TM7), and animal and microbial rhodopsin
families are known so far. Animal rhodopsins are present
in animal retina to transfer visual signals to brain and arealso related to non-visual light sensing in various tissues.
Microbial rhodopsins show diverse functions: light-driven
ion pump, light-gated ion channel, phototactic sensor, lightdependent regulation of gene expression and enzyme, andso on. Both types of rhodopsins are being widely used in
optogenetics to control various cellular events, such as neuralactivity, gene expression, dynamic protein localization, andso on, by light.
In 2020, we reported the functional characterization ofschizorhodopsin (SzR) which was found in metagenome
assembled genomes of Asgard archaea which is thought tobe the closest living prokaryote to the last common ancestorof eukaryotes [1]. The ion-transport activity assays revealed
that SzRs function as light-driven inward proton (H+) pumps[2]. The inward H+ transport of SzRs are significantly
higher than that of another inward H+ pumping rhodopsin,
xenorhodopsins (Fig. 1). The high-speed atomic force
microscopy revealed the trimeric structure of SzR in lipid
bilayer. The photocycle of SzR in which K, L, L/M and M
intermediates are included was determined by the laser flash
photolysis spectroscopy. The transient absorption change
of a pH indicator (cresol red) indicated that the substrate
H+ is released to the cytoplasmic milieu and taken up fromthe extracellular side on the M-accumulation and decay,
respectively. This suggests that no metastable trapping of
H+ released from retinal Schiff base (RSB) occurs on any
amino acid residues, and it was supported by the low-temperature Fourier transform infrared spectroscopy. This is quite

Reference[1] J. Yoshinobu et al., J. Chem. Phys. 153, 064702 (2020). doi:
10.1063/5.0011175
Authors
J. Yoshinobu, K. Mukai, T. Ozaki, Y. Yamada-Takamuraa et al.
aJapan Advanced Institute of Science and Technology

Fig. 1. Inward H+ transport activity of six SzRs (top and middle)
compared with outward H+ pumping GPR and inward H+ pumping
XeR (PoXeR) (bottom).

ISSP Activity Report 202013

Omnidirectional Controlof Large Electrical Output
in a Topological Antiferromagnet
Nakatsuji Group

Fig. 2. Trp163 of C1C2 plays a role regulating the branching ratio of H+
transfers between RSB and counterions, Glu162 and Asp292.

different from XeR, in which protonation of the proton
accepting aspartate on the cytoplasmic side is involvedin H+ transfer from the RSB to the cytoplasmic milieu. A
comprehensive amino-acid mutation experiment suggested
that Cys75 and Glu81 in the transmembrane helix (TM) 3
and Asp184 in TM7 is critical for the inward H+ transport ofSzR.
Channelrhodopsins (ChRs) are light-gated cation
channels which nonspecifically transports various cations
according to the electrochemical potentials of cells. In orderto reveal the cation transport function of ChR, we investigated a mutant of a member of ChR, C1C2, in which a
tryptophane residue in TM3 was substituted with phenylalanine (C1C2 W163F). Trp163 of C1C2 is highly conservedin most microbial rhodopsins, but its relationship to thechannel function is not known. C1C2 W163F showed greatly
attenuated channel activity, while outward proton pumping
activity became more prominent. This result indicates that
Trp163 plays a critical role in suppressing the outward
proton pumping function and increasing channel activity by
regulating the branching ratio of proton transfer to the twocounterions Glu162 and Asp292 respectively (Fig. 2) [3].

The net magnetization defines the signal size of memory
devices and sensors, and thus the manipulation of magnetization is essential for the broad application of ferromagnets.
However, the magnetization itself causes a dilemma. Whileits size matters to obtain strong responses upon its reversal,
the large magnetization simultaneously suppresses the rangeof its directional control due to the demagnetizing field. To
overcome the demagnetization/shape barrier, one needs tocarefully tune the crystalline and interfacial effects [1]. Thus,
it would be ideal to find alternative magnets that carry nomagnetization but strong responses.
The antiferromagnet Mn­3Sn hosts a large Berry curvature in momentum space owing to the topological metallic
state. The Berry curvature can be manipulated by the ferroicordering of the cluster magnetic octupole and remains large
even with negligible magnetization. This feature enables
disproportionately large transverse responses such as anomalous Hall effect (AHE)[2] and anomalous Nernst effectWe also reported the theoretical and experimental studies on
the Cotton effect observed in the visible CD spectrum of sodium
pump rhodopsin (KR2) [4]. KR2 shows a visible CD spectrum
whose peak is significantly red-shifted from that of its absorption spectrum. The transition density fragment interaction (TDFI)
method quantitatively revealed that this shift is caused by the
excitonic coupling between retinal chromophores in pentamer of
KR2 [4].
References[1] P.-A. Bulzu, A.- . Andrei, M. M. Salcher, M. Mehrshad, K. Inoue,
H. Kandori, O. Béjà, R. Ghai, and H. L. Banciu. Nat. Microbiol. 4,1129 (2019)[2] K. Inoue, S. P. Tsunoda, M. Singh, S. Tomida, S. Hososhima,
M. Konno, R. Nakamura, H. Watanabe, P.-A. Bulzu, H. L. Banciu,
A.- . Andrei, T. Uchihashi, R. Ghai, O. Béjà, and H. Kandori, Sci.
Adv. 6, eaaz2441 (2020)[3] Y. Nagasaka, S. Hososhima, N. Kubo, T. Nagata, H. Kandori, K.
Inoue, and H. Yawo. Biophys. Physicobiol. 17, 59 (2020)[4] K. J. Fujimoto and K. Inoue, J. Chem. Phys. 153, 045101(2020).
Authors
K. Inoue, T. Nagata, H. Yawo

14

ISSP Activity Report 2020

Fig. 1. (a) Schematic illustration of the rotation planes. θ and φ are theangles from the normal direction within the planes parallel and perpendicular to the electric current direction, respectively. The orange arrow
represents the direction of the external magnetic ﬁeld. (b) Field dependence of the Hall resistivity obtained for the Mn3Sn ﬁlm with various
angles θ at 300 K. The black arrows indicate the ﬁeld sweep direction. (c) Schematic illustrations ofthe 3D omnidirectional property for
randomly oriented multi-grains and the 2D omnidirectional property
for a single crystal/grain. The red arrow represents the direction of themagnetic order parameter. (d) Field dependence of the Hall resistivity
obtained for the Mn3Sn single crystal with various angles θ at 300
K. Inset: Schematic illustrations of the rotation planes for the single
crystal. (e) Schematic illustration of heat flux sensor. (f) Field dependence of the Nernst voltage VANE for the Mn3Sn thermopile made of
120 pairs of Mn3Sn/Au wires under several values of the heat ﬂux
qheater at 300 K.

(ANE)[3], opening up the possibilities for replacing ferromagnets with antiferromagnets in magnetic devices. As thefirst step for spintronics applications, we fabricated Mn3Sn
thin films [4]. And more recently, we demonstrated electricalmanipulation of the magnetic ordering in the Mn3Sn /heavy
metal bilayer devices [5], which has triggered extensive
research activities into the interface properties of Mn3Sn thin
film.
In this study [6], we report the omnidirectional behavior
in Mn3Sn due to negligible shape anisotropy. Moreover, wedemonstrate a new method for multi-level data recording anda magnetically robust ANE-type heat flux sensor.
We have fabricated the polycrystalline Mn3Sn thin films
on the thermally oxidized Si substrate by dc magnetron
sputtering methods [4]. With these thin films, we measured
the anomalous Hall effect as a function of magnetic ﬁeld
angles, θ and ϕ (Fig. 1(a)). As shown in Fig. 1(b), the ﬁeld
dependence of AHE obtained for various θ exhibits a multistable signal. Namely, the spontaneous Hall signal gradually
decreases with increasing θ, indicating that the polarization direction of the magnetic octupole essentially follows
the ﬁeld direction rather than being restricted within the xy
plane. Notably, the rotation for both θ and ϕ angles shows
the same angular dependence, indicating that the magnetic
octupole can be freely (omnidirectionally) orientated in all
directions (Fig. 1(c)) as a result of the negligibly small shapeanisotropy and polycrystalline arrangement.
Interestingly, single-crystal/grain samples also show themulti-stable signals as a function of the ﬁeld angle, but only
for field rotations within the kagome layer (Fig. 1(d)). Ferromagnets with magneto-crystalline anisotropy sufficiently
larger than the shape anisotropy can show similar multistable behavior in their polycrystalline form. However, inthe single crystal samples, the magnetization is restricted
to one direction due to the substantial magneto-crystalline
anisotropy, and therefore only a binary signal can occur.
The new multi-level recording method found in Mn3Sn may
allow writing and reading beyond two units of information(0 and 1), namely, a device comprising a single grain of
nanometer scale can hold three or more units of information.
Taking advantage of the small shape anisotropy and theomnidirectional property, we developed a ANE heat ﬂux
sensor consisting of micro-fabricated Mn3Sn wires (Fig.
1(e)). This sensor exhibits the heat ﬂux sensitivity comparable to that made of ferromagnetic materials while being
resistant to magnetic ﬁeld disturbances (Fig. 1(f)).
References[1] R. Skomski and J. M. D. Coey, Scr. Mater. 3, 112 (2016).
[2] S. Nakatsuji et al., Nature 527, 212 (2015).
[3] M. Ikhlas, T. Tomita et al., Nat. Phys. 13, 1085 (2017).
[4] T. Higo et al., Appl. Phys. Lett. 113, 202402 (2018).
[5] H. Tsai, T. Higo et al., Nature 608, 580 (2020).
[6] T. Higo et al., Adv. Funct. Mater. 31, 2008971 (2021).
Authors
T. Higo, Y. Lia, K. Kondoub, D. Qu, M. Ikhlas, R. Uesugi, D. NishioHamane, C. L. Chiena, Y. Otani, and S. Nakatsuji
aJohns Hopkins University
bRIKEN-CEMS

Large Hall Signal due to Electrical
Switching of an Antiferromagnetic
Weyl Semimetal State
Nakatsuji, Otani, and Miwa Groups
The topologically protected properties in Weyl
semimetals have been extensively studied in recent years.
The Weyl points act as sources and drains of Berry curvature, leading to significant responses such as anomalous Hall
effect (AHE) and anomalous Nernst effect (ANE) [1-3].
In nano-scale technology, such large topological responses
may play a significant role in developing next-generationelectronic devices.
Recently, the electrical manipulation of the topologicalstate has been demonstrated in antiferromagnetic Weyl
semimetal Mn3Sn [4]. Mn3Sn is a metallic antiferromagnet
with the hexagonal D019 structure and ABAB-stacking of
Mn kagome lattice along [0001]. The geometrical frustration leads to a 120-degree structure made of Mn magnetic
moments with a negative vector chirality (Fig 1(a)). This
non-collinear structure can be viewed as a ferroic order ofa cluster magnetic octupole made of six neighboring Mn
moments. The polarization of the magnetic octupole determines the distribution of Weyl points in momentum space
and thus the polarity of AHE (Fig 1(b)). Figure. 1(c) shows
the schematic image of the current switching in Mn3Sn/
heavy metal heterostructures. Taking Mn 3Sn/W as an
example, with an applied electrical current in the multilayer,
a spin current generated by the spin Hall effect in the W

Fig. 1. (a) Crystal and spin structures of Mn3Sn. Blue and light blue
spheres represent Mn atoms on the kagome bilayers, forming anoctahedron. Black and gray spheres represent Sn atoms. The noncollinear spin structure consisting six Mn magnetic moments (yellow
and green arrows) can be viewed as a ferroic ordering of an magnetic
octupole (purple arrow). (b) Hall voltage measured in Mn3Sn/W
devices. The sign of readout voltage is determined by the out-of-planecomponent in the polarization direction of the magnetic octupole of
Mn3Sn (purple and blue arrows), namely, “0” or “1” state. (c) Bottom:
Schematic image of Mn3Sn/heavy metal devices and the setup ofelectrodes. The samples are fabricated in 16 μm × 96 μm Hall bar
structure with Au/Ti electrodes. Top: Schematic image of the current
switching in Mn3Sn/W bilayer. An electrical current flowing in the W
layer generates a spin current by the spin Hall effect of W. This spincurrent induces a spin-orbit torque in the Mn3Sn layer and switch thepolarization direction of the magnetic octupole. Here, red and blue thinarrows represent the spin moments of the spin current. Purple and light
purple thick arrows represent the polarization direction of the magnetic
octupole.

ISSP Activity Report 202015

layer exerts the spin-orbit torque on the Mn3Sn spin texture,causing the switching of the polarization direction of themagnetic octupole. This manipulation of AHE enables us tostore the information from the electrical signal, “0 ” or “1 ”
state, into the magnetic octupole of Mn3Sn. Thus, Mn3Sn
can work as a non-volatile memory, in which the information
can be written and read by current. Moreover, the antiferromagnetic structure of Mn3Sn allows electronic devices
with higher density and computing speed than those made of
conventional ferromagnets [5]. For applications, it is essential to enhance the readout signal of the switching. This study
demonstrates that the switching signal of Mn3Sn can growdramatically by adjusting the crystal orientation and interface
condition of the Mn3Sn/heavy metal structures. Moreover, byincreasing the read current, the readout voltage may go wellbeyond 1 mV, a milestone for future memory technology.
To find the largest readout signal, we prepared four
different multilayer stacks: (i) Ru(2)/Mn3Sn(40)/Pt(5), (ii)
Mn3Sn(40)/Pt(5), (iii) Ru(2)/Mn3Sn(40)/W(5), and (iv)
Mn3Sn(40)/W(5), all units in nm, deposited on a Si/SiO2
substrate. For the sample (i)-(iii), the stacks are annealed
at 450 °C for 0.5 h after the fabrication of the Mn 3Snlayer. The samples (iv) Mn3Sn(40)/W(5) is annealed at
450 °C for 0.5 h after the fabrication of the W layer. Using
these thin films, a Hall bar structure (16 μm × 96 μm)
is fabricated, with Ti/Au electrodes attached (Fig 1(c)).
Figure. 2(a) shows the AHE signal in W devices with andwithout the Ru layer. By removing the Ru layer, the AHE
becomes 1.6 times larger than that observed in devices with
the Ru layer. Similar enhancement of the AHE also occurs in
Pt devices. This enhancement comes from the crystal orientation change of Mn3Sn. The X-ray diffraction analysis showsthat the kagome plane of Mn3Sn tends to align in-plane in
the presence of the Ru underlayer. After removing the Ru
layer, Mn3Sn layer becomes completely polycrystalline. The
out-of-plane component of the magnetic octupole is morethan one with the Ru layer, resulting in a larger AHE. Next,
we investigated the electrical switching in W devices. In
these experiments, both electrical current and bias field areapplied along the longitudinal direction (x-direction) andthe transverse Hall voltage VH is detected in the y-direction,
as shown in Fig. 1(c). A strikingly large switching Hall
voltage, ΔVHcurrent ~70 μV, is observed in Mn3Sn/W devices(Fig. 2(b)). This Hall signal is 3 times larger than thatobserved in the Ru/Mn3Sn/W devices, more pronounced than
the 1.6 times difference of the AHE caused by removing the
Ru layer. We attribute this enhancement in current switching
to the different annealing process because only the Mn3Sn/
W samples is once annealed after the W deposition. Thisadditional annealing process may affect the interface condition. Finally, since the Hall voltage is proportional to theFig. 2. (a) Hall voltage VH as a function of a perpendicular magnetic
field Hz for Ru/Mn3Sn/W and Mn3Sn/W devices, respectively. (b) VH
as a function of the write-current Iwrite under a bias field μ0Hx = 0.1
T applied along the electrical current direction for Ru/Mn3Sn/W and
Mn3Sn/W devices, respectively. (c) Switching Hall voltage ΔVH as afunction of the read current Iread in the Mn3Sn(40)/W(5) sample. Inset:
Hall resistance ΔRH as a function of the read current Iread.

16

ISSP Activity Report 2020

read current within a suitable temperature range, we tried toenhance the read current to maximize the readout signal (Fig.
2(c)). We found that the readout switching Hall voltage ΔVH
can exceed 1 mV when applying 3 mA read current. Thisobserved mV order Hall voltage is a significant advance inthe electrical switching technology, and our results may pave
the path for designing a new type of memory device using
the robust topological properties of Weyl antiferromagnets.
References[1] H. B. Nielsen and M. Ninomiya, Phys. Lett. B, 130, 389 (1983).
[2] S. Nakatsuji, N. Kiyohara, and T. Higo, Nature, 527, 212 (2015).
[3] M. Ikhlas, T. Tomita, T. Koretsune, M. Suzuki, D. Nishio-Hamane,
R. Arita, Y. Otani, and S. Nakatsuji, Nat. Phys. 13, 1085 (2017).
[4] H. Tsai, T. Higo, K. Kondou, T. Nomoto, A. Sakai, A. Kobayashi,
T. Nakano, K. Yakushiji, R. Arita, S. Miwa, Y. Otani, and S. Nakatsuji,
Nature 580, 608 (2020).
[5] T. Jungwirth et al., Nat. Nanotechnol. 11, 231 (2016).
Authors
H. Tsai, T. Higo, K. Kondoua, S. Sakamoto, A. Kobayashi, T. Matsuo,
S. Miwa, Y. Otani, and S. Nakatsuji
aRIKEN, Center for Emergent Matter Science (CEMS)

A Tunable Stress Dilatometer and
Measurement of the Thermal Expansion
under Uniaxial Stress of Mn3Sn
Nakatsuji GroupThe hexagonal antiferromagnet Mn3Sn with triangularspin structure exhibits large spontaneous electronic responses
associated with Weyl fermions [1], which has attracted
tremendous attention due to its potential for spintronic
applications [2]. The single crystals of this compound are
known to be stable in their off-stoichiometric compositions. Depending on the composition, three distinct kinds ofmagnetic phases can emerge as a function of temperature,
namely the high-temperature triangular spin structure phase(q = 0) [3], the intermediate-temperature incommensurate
spin spiral phase (q ≠ 0) [4], and the low-temperature cluster
spin glass phase [5]. The topological transport properties
vanish in the incommensurate phase, whose origin remains
elusive. A theoretical study suggests that out-of-plane antiferromagnetic exchange interaction may destabilize the triangular spin structure [6].

Fig. 1. Uniaxial stress dilatometeris consistent with that estimated from heat capacity data.
Above -σz ~ 0.5 GPa, ∂TH/∂σz does not deviate appreciably
from its ambient pressure value; this information cannot
be extrapolated solely based on the zero pressure ∂TH/∂σz.
Overall, we found that the transition is insensitive to stresscompared with its response to chemical doping, suggestingthat the lattice is not the primary driver of the transition. This
device is compatible with other probes, such as transportand spectroscopy, opening a new avenue to study phases ofmatter under extreme conditions [9].
References[1] T. Chen, T. Tomita, S. Minami, M. Fu et al., Nat. Comm. 12, 572(2021).
[2] H. Tsai, T. Higo et. al., Nature 580 (2020).
[3] T. Nagamiya, S. Tomiyoshi, and Y. Yamaguchi, Solid State
Commun. 42 (1982).
[4] J.W. Cable et. al., Solid State Commun. 88 (1983).
[5] W. J Feng, D. Li et. al., Phys. Rev. B 73 (2006).
[6] S. Dasgupta and O. Tchernyshyov, Phy. Rev. B 102 (2020).
[7] M. E. Fischer and W. Selke, Phys. Rev. Lett. 44 (1980).
[8] A. Andrianov et. al., Phys. Rev. B 62 (2000).

[9] M. Ikhlas, K. Shirer et. al., Appl. Phys. Lett. 117 (2020).

Fig. 2. Thermal expansion of Mn3Sn under uniaxial pressure. (a)Sample’s c-axis length change L-L0 vs. temperature under various
applied uniaxial forces. Inset shows the sample used for the measurements. (b) Derivative of c-axis length change -d(L-L0)/dT vs. temperature (bottom panel) under various applied uniaxial forces.

A long-wavelength incommensurate spin structure canoriginate from various mechanisms, such as competition
between short-range and long-range exchanges in CeSb [7],and Fermi surface nesting in hexagonal rare-earth elemental
metals [8]. In the latter case, Fermi surface nesting is largely
determined by the lattice constant ratio c/a, which is tunable
by alloying or uniaxial pressure. Uniaxial pressure is a clean
tuning parameter compared to chemical doping. Here, we
explore the evolution of the magnetic phase diagram of
Mn3Sn under c-axis uniaxial pressure.
In collaboration with Dr. Clifford Hicks and Dr. Kent
Shirer from Max Planck Institute for Chemical Physics ofSolids (MPI CPfS), Dresden, Germany, we developed apiezoelectric-based uniaxial stress dilatometer that provides
in-situ stress tunability, as shown in Fig 1. This device allows
high-sensitivity thermal expansion measurements, offering acompelling route to thermodynamic information on magnetic
phase evolution under large and homogenous applied stress.
The sample is sculpted into a paddle using a focused ion
beam and then epoxied across the central gap of the sample
carrier, as seen in the inset of Fig 1a. Applying voltage to thepiezo stacks displaces a spring and delivers uniaxial stress tothe sample, while the sample’s length change was estimatedfrom the displacement of the parallel plate capacitor attachedto the carrier.
Figure 2a shows the temperature dependence of c-axis
length change L-L0 of Mn3Sn at various applied uniaxial
forces. At zero force, the sample exhibits a first-order transition from triangular to spiral spin structure on cooling below
TH = 267 K, accompanied by a discontinuity in L-L0. Underuniaxial force, the transition splits into two, as shown in
Fig. 2b. The peak in –dΔL/dT that shifts to lower temperatures with an increasing uniaxial force corresponds to the
response of the central narrow portion of the sample. Withan elastic compressive stress of σz ~-1.5 GPa, the transitionis suppressed by ∆T ~ -50 K. Below -σz ~ 0.5 GPa, TH hasa linear dependence on σz, with ∂TH/∂σz = 33.3 K at zerostress. We estimate an entropy change of ΔS ~ 0.1 mJ mol-1
K-1 from Clausius-Clapeyron relation, using the magnitudeof the discontinuity in ΔL and ∂TH/∂σz. This value of ΔS

Authors
M. Ikhlas, K. Shirera, P.-Y. Yanga, A. P. Mackenziea, C.W. Hicksa, and
S. Nakatsuji
aMax Planck Institute for Chemical Physics of Solids

Large Transverse Thermoelectric Effectin Iron-Based Binary Ferromagnets
Nakatsuji and Miwa Groups
Thermoelectricity provides vital technology for versatileenergy harvesting and heat current sensors. So far, thermoelectric technologies are focused on the longitudinal Seebeck
effect. Its transverse counterpart, the anomalous Nernst effect(ANE), has recently gained significant attention, owing
to several potential benefits [1,2]. Namely, the transverse
geometry of the Nernst effect enables simplified structuresof thermoelectric generators with enhanced conversion
efficiency once the suitable materials become readily available. Moreover, the transverse geometry is hypothetically
better suited for thermoelectric conversion, as the Ettingshausen heat current should support the Nernst voltage while
the Peltier heat current may suppress the Seebeck voltage[3]. A server obstacle here is that the anomalous Nernst
effect is too small compared to the Seebeck effect for reallife thermoelectric applications. Thus, it is essential to design
a new class of materials that exhibit a large ANE without anexternal magnetic field.
To find candidate compounds efficiently, we carried out
a high-throughput calculation to screen materials and found
two candidate iron-based cubic compounds, Fe3X (X = Ga,

Fig. 1. (a) Crystal structures of Fe3X (X = Ga, Al) (b) Temperaturedependence of the Nernst signal −Syx in Fe3X (X = Ga, Al) under a[100] magnetic field of 2T. (c) The nodal web in momentum space
formed by nodal lines (yellow) of nearly flat energy dispersion aroundthe L point.

ISSP Activity Report 202017

Al) (Fig. 1a). We discovered record high spontaneous transverse thermoelectric effects at room temperature in thesematerials, reaching about 6 μVK-1 in Fe3Ga and 4 μVK-1 in
Fe3Al (Fig. 1b). We then succeeded in fabricating Fe3Ga andFe3Al thin films that display an ANE of about 4 μVK-1 and
2 μVK-1 at room temperature with an applied in-planetemperature gradient. For an out-of-plane temperature
gradient, these thin films exhibit a zero-field ANE, with acoercivity BC of the in-plane magnetization being about 40
Oe in Fe3Ga and 20 Oe in Fe3Al, respectively. These featuresare suitable for designing low-cost, flexible thermoelectric
generators.
The comparison between experiment and theory indicatesthat the Fermi energy tuning to the nodal web is the key tothe substantial enhancement in the transverse thermoelectriccoefficient. Figure 1(c) shows a schematic of the nodal web,a flat band structure made of interconnected nodal lines. The
Berry curvature is particularly enhanced at the momenta
connecting the edge of the nodal web around the L point at
the Brillouin zone boundary, extending over a quasi-2D areaspanned by the web. The strongly enhanced Berry curvature
occurs near the momenta originally belonging to the flat
nodal web, such as the one around the L point.
Our innovative iron-based thermoelectric material represents a significant step toward commercializing thermoelectric generators that can power small devices such as
remote sensors or wearable devices. It is vital to enhance thecoercivity further to achieve stable performance in daily use.
Finally, it would be an interesting future direction to look
for an enhanced output by combining the ANE with the spin
Seebeck effect, both of which occur in the same transverse
geometry. [4]References[1] A. Sakai et al., Nat. Phys. 14, 1119 (2018).
[2] M. Ikhlas, T. Tomita et al., Nat. Phys. 13, 1085 (2017).
[3] M. Mizuguchi, and S. Nakatsuji, Sci. Technol. Adv. Mater. 20, 262(2019).

state using Mn3Sn/nonmagnetic metals (NM = Pt, W, Cu)bilayer devices and the spin-orbit torque (SOT) switching
method [5]. The inverse triangular spin structure of Mn3Sn
can be viewed as a ferroic ordering of cluster magnetic
octupoles. The magnetic octupole’s polarization direction
determines the location of Weyl nodes and the associateddistribution of the Berry curvature in the momentum space(Fig. 1(b) right) [2]. With an electrical current applied to
the Pt layer, a spin polarized current generated by the spin
Hall effect of Pt induces the SOT on the Mn3Sn layer andcauses the switching of the polarization direction of themagnetic octupole (Fig. 2a). The measurement configuration and optical micrograph of the fabricated bilayer Hallbar devices are shown in Fig. 2(b). We first perform themagnetic field switching of the Hall voltage VH by using
an out-of-plane magnetic field Hz and a read current ofFig. 1. (a) Mn3Sn crystal structure and inverse triangular spin (ITS)
structure. The Mn magnetic moments (light blue and pink cylindricalarrows) lie within the kagome layer with the ABAB stacking sequenceand form the ITS structure at room temperature. This spin structure
can be viewed as a ferroic ordering of cluster magnetic octupoles.
(b) Bottom-left: cluster magnetic octupole (orange cylindrical arrow)consisting of the six spins on the kagome bilayer. Right: schematic of
the Weyl point distribution near the Fermi energy in momentum space(kx-ky plane at kz = 0); the corresponding magnetic structure is shownin the left-side figure. The red and blue spheres correspond to Weylnodes acting as sources (+) and drains (-) of the Berry curvature (green
arrows). Inset: three-dimensional schematic of a pair of Weyl nodes.

[4] A. Sakai, S. Minami, T. Koretsune, T. Chen, T. Higo et al.,Nature 581, 53 (2020).
Authors
A. Sakai, S. Minamia, T. Koretsuneb, T. Chen, T. Higo, Y. Wang,
T. Nomotoc, M. Hirayamad, S. Miwa, D. Nishio-Hamane, F. Ishiia,
R. Aritac,d, and S. Nakatsuji
aKanazawa University
bTohoku University
cUniversity of Tokyo
dRIKEN CEMS

Electrical Manipulation of a Topological
Antiferromagnetic State
Nakatsuji, Otani, and Miwa Groups
The Weyl semimetal features nodal points formedby two linearly dispersive non-degenerate bands. These
touching points or Weyl nodes act as topologically protectedmonopoles or antimonopoles of underlying Berry curvature, resulting in large anomalous Hall effect (AHE) andchiral anomaly. The electrical manipulation of Weyl nodes isamong the key topics of technological innovation utilizing anovel topological state. Moreover, electrical manipulation ofan antiferromagnetic Weyl metal is considered a significant
advancement, given the prospects of antiferromagnetic (AF)spintronics for realizing high-density, ultrafast devices [1].
We demonstrate the electrical switching of the AF Weyl

18

ISSP Activity Report 2020

Fig. 2. (a) Schematic image for the spin-orbit torque switching. Undera write current and a bias field along the x-direction, the spin-polarized
current in Pt (green cylindrical arrows on yellow spheres) exerts aspin-orbit torque, causing the polarization axis of the cluster magnetic
octupole to switch (orange cylindrical arrow) in the polycrystalline
Mn3Sn (b) Measurement configuration and optical micrograph of
the Mn3Sn-nonmagnet bilayer Hall bar devices. (c) Hall voltage VH
vs. magnetic field along the z-direction Hz obtained for the Mn3Sn/
Pt 7.2 nm device at room temperature. (d) Hall voltage VH vs. write
current Iwrite for the Pt 7.2 nm, Cu 5 nm, and W 7.2 nm devices atroom temperature. The Hall voltage is normalized by the zero-field
Hall voltage |ΔVHfield| obtained from the magnetic field dependence
measurements for each sample.

0.2 mA, and a clear hysteresis of VH with the zero-fieldchange of ΔVHfield (= VH(+Hz→0) − VH(−Hz→0)) is observed(Fig. 2(c)). To examine the possible SOT switching of
Mn3Sn, we pass a 100 ms write-pulse current Iwrite along thex-direction; then, we wait for 600 ms after the pulse current
and measure VH with a 0.2 mA read current. Figure 2(d)shows VH as a function of Iwrite in Pt, W, and Cu devices. For
the NM = Pt (spin Hall angle θSH > 0) and a bias field Hx
parallel to the current direction, a clear negative (positive)
jump appeared in the Hall voltage for a positive (negative)
current larger than a critical threshold write-current Ic. The
magnitude of the jump reaches ~30 % of the total Hall
voltage change |ΔVHfield | in the field sweep measurements.
To confirm that the observed switching of VH is related to the
SOT due to the spin Hall effect in the NM layer, we prepared
NM = W (θSH < 0) and Cu (θSH ~ 0). For NM = W, theswitching polarity is opposite to the Pt case, while for NM =Cu, hysteresis is absent with the electrical current cycle. The
difference in switching polarity between Pt and W devices
and the absences of switching in Cu devices cannot be
explained by the current-induced Oersted field but agree wellwith the sign of θSH of the NM layer. These results demonstrate that SOT from the NM layer induces the perpendicularswitching of the AF domain and thus manipulates the direction of the Weyl nodes.
In recent years, utilizing antiferromagnets in spintronics
devices have attracted significant attention as its vanishingsmall stray fields and much faster spin dynamics than ferromagnets [1]. We achieved the electrical switching of the AF
Weyl metal using the same protocol as the one used for ferromagnetic metals [3, 4]. The critical write current density in
the NM layer is considerably smaller than that in the NM/FM
devices. These results indicate that topological antiferromagnets offer the unmatched potential for spintronic applications
that may surpass today’s ferromagnetic counterparts [5].
References[1] T. Jungwirth et al., Nat. Nanotechnol. 11, 231 (2016).
[2] S. Nakatsuji, N. Kiyohara, and T. Higo. Nature 527, 212 (2015).
[3] I. M. Miron et al., Nature 476, 189 (2011).
[4] L. Liu et al. Science 336, 555 (2012).

[5] H. Tsai, T. Higo, K. Kondou, T. Nomoto, A. Sakai, A.
Kobayashi, T. Nakano, K. Yakushiji, R. Arita, S. Miwa, Y. Otani,and S. Nakatsuji, Nature 580, 608 (2020).
Authors
H. Tsai, T. Higo, K. Kondou a , Takuya Nomoto b , A. Sakai,
A. Kobayashi, T. Nakanoc, K. Yakushijic, R. Aritaa, S. Miwa, Y. Otani,and S. Nakatsuji
aRIKEN CEMS
bThe University of Tokyo
cAIST

bringing the study on strongly correlated topological phasesto the main stage of basic science and technological innovation. These anomalous transport properties are consideredfingerprints of Weyl fermions in the momentum-space band
structure [4]. Therefore, understanding the role of magnetic
Weyl fermions in driving the transport properties of chiralantiferromagnets is all the more important for making reallife applications with topological states of matter.
In this work, we establish Weyl fermions as the origin of
the large anomalous Hall and Nernst effects in Mn3X systems
by combining our previous reports with a new, comprehensive set of transport measurements and theoretical analysis
of high-quality Mn3Sn and Mn3Ge single crystals [5]. In
particular, Mn3Ge provide an ideal experimental platform
for identifying transport signatures stemming from Weyl
fermions; in this compound, the inverse triangular covers
a wide temperature range down to at least 0.3 K, approximately one-thousandth of the Néel temperature. This featureallows a clear-cut detection of the Weyl-fermion-induced
transport anomalies at sufficiently low temperatures, where
spin fluctuations are essentially suppressed.
The fingerprint of Weyl points in magnetotransport is
known as the chiral anomaly. With a magnetic field, the Weyl
crossings are quantized into Landau levels (LLs), and thelowest LL are divided into left- and right-movers of opposite
chirality. These two groups do not mix, leading to separate
number conservation of the three-dimensional left- and righthanded Weyl fermions. Once an electric field parallel to themagnetic field is applied, the conservation of chirality nolonger holds due to mixing the left-and-right movers. In sucha case, charge pumping between the Weyl nodes of opposite
chirality generates the positive longitudinal magnetoconductivity (LMC) or the negative magnetoresistivity (LMR)
only when the electric current and magnetic field are parallel
to each other. This strongly anisotropic behavior of LMC
provides transport evidence for Weyl fermions.
Our findings of magnetotransport signatures specific tochiral anomalies in Mn3Ge and planar Hall effect in Mn3Sn
provide concrete evidence for the presence of Weyl fermionsin both materials. Figure 1a shows the field dependence ofthe magnetoconductivity observed in Mn3Ge at 0.3 K. For
applied fields B > 2T, the magnetoconductivity becomes
positive for the parallel configuration and is nearly quadratic
in magnetic field. The B2 dependence of the positive LMC
is likely a result of strongly titled type-II Weyl cones withthe applied magnetic field perpendicular to the tilt axis. We

Weyl-Fermion-Induced Anomalous
Transport in the Chiral Antiferromagnets
Mn3X, (X = Sn, Ge)
Nakatsuji GroupThe blooming field of spintronics has bridged astonishingly complex antiferromagnetic structures to the realm ofenergy-efficient memory technologies. However, a significant obstacle to overcome is the tiny response of the antiferromagnetic structure to external magnetic fields [1]. The
recent discoveries of large room-temperature anomaloustransport effects in antiferromagnets Mn3X (X = Sn, Ge)[2,3] signifies an experimental breakthrough in this direction,

Fig. 1. (a) The magnetoconductivity as a function of the magnetic field
B for the parallel and perpendicular configurations with the current
I || [0001] measured at 0.3 K in Mn3Ge. The dashed line is a fit to thequadratic magnetic field dependence. (b) Angle dependence of thelongitudinal magnetoconductivity (top) and the planar Hall effect(PHE) (bottom) in Mn3.06Sn0.94 obtained at 300 and 100 K underB = 3 T. (c, d) Contour plots of the calculated Berry-curvature spectrum|Ωz| in the kx–ky-plane under B || [01-10] at kz = 0 (Å−1) (c) and at
kz = 0.137 (Å−1) (d). The arrows indicate the Berry curvature inducedby the pairs of Weyl points WP1 and WP3 (WP'3) near the Fermi level.

ISSP Activity Report 202019

further verified that the angular dependence of the magnetoconductivity and the planar Hall signal observed in Mn3Sn
agree well with the theoretical forms for the chiral anomaly(Fig. 1b), another transport evidence for magnetic Weyl
fermions.
Moreover, we compare our results on the anomalous
Hall and Nernst effects with the first-principles calculations
that consider the substantial bandwidth renormalization andquasiparticle damping due to the strong electronic correlation in Mn3X systems (Fig. 1c, d). The calculated transverse thermoelectric coefficients well reproduce the overalltemperature dependence of the experimental data, suggestingthat the large Berry curvature stemming from the Weyl nodes
leads to significantly enhanced AHE and ANE in the absenceof net magnetization.
Strongly correlated topological states have become acentral focus for quantum materials research, and Mn3X
(X = Sn, Ge) is widely considered a textbook example ofthis kind. Our findings provide concrete evidence for thepresence of Weyl fermions in both materials, which may
trigger further exploration of their rich physics and usefulproperties emerging from the interplay between magnetismand band topology.
References[1] T. Jungwirth et al., Nat. Nanotechnol. 11, 231 (2016).
[2] S. Nakatsuji et al., Nature 527, 212 (2015).
[3] M. Ikhlas, T. Tomita et al., Nat. Phys. 13, 1085 (2017).
[4] K. Kuroda et al., Nat. Mater. 16, 1090 (2017).
[5] T. Chen, T. Tomita, S. Minami, M. Fu et al., Nat. Comm. 12, 572(2021).
Authors
T. Chen, T. Tomita, S. Minami, M. Fu, T. Koretsunea, M. Kitatani,
I. Muhammad, D. Nishio-Hamane, R. Ishii, F. Ishiib, R. Aritac,d, and
S. Nakatsuji
aTohoku University
bKanazawa University
cRIKEN CEMS
dThe University of Tokyo

Giant Effective Damping ofOctupole Oscillation in a Chiral
Antiferromagnet Mn3Sn

Fig. 1. (a) Spin and crystal structures of Mn3Sn. Different colors areused to denote Mn and Sn atoms in the z = 0 and z = 1/2 planes. The
inverse triangular spin-structure can be viewed as a ferroic ordering ofcluster magnetic octupole, which possesses the same symmetry as the
spin-magnetization (e.g. as indicated by a mirror plane (orange line)).

Mn atoms along the [0001] axis. Red (blue) circles inFig. 1 indicate Mn atoms in A- (B-) plane of the kagome
lattice. An inverse triangular spin structure is stabilized byexchange and Dzyaloshinskii-Moriya interactions [1,2]. The
inverse triangular spin structure is made of a ferroic orderingof cluster magnetic octupoles [3].
Figure 2(a) shows typical TR-MOKE results, where amagnetic field of 2 T was applied normal to the surface.
First, a pump light induces rapid decrease in the polar
MOKE intensity of a probe light, similar to ultrafast demagnetization observed in ferromagnetic metals [4]. Consecutively, the MOKE intensity start to recover with delay time
more than 0.3 ps, exhibiting a small but clear oscillation
during the recovery. To further characterize the oscillating
component, a non-oscillating component was estimated asa background (black solid curve) and subtracted from theraw data. The lower panel of Fig. 1(b) shows the TR-MOKE
signals after subtracting the background. Figure 1(c) also
shows typical TR-MOKE results (upper panel) and theanalysis for the oscillating component (lower panel) in a
relatively long-time range. From the fits in the lower panelof Figs. 1(b) (orange curve) and 1(c) (blue curve), oscillation frequencies (ωI, ωII) are determined as a function of an
external magnetic field, namely, ωI = 0.86 THz and ωII =18 GHz. The oscillating behaviour is most significant whenthe magnetic field is normal to the Mn3Sn surface. Because

Miwa, Nakatsuji, and Otani Groups
Understanding of spin dynamics forms the basis of
spintronic application. For the ultrafast THz control ofstaggered moments in antiferromagnets, the time-resolved
observation of spin dynamics is essential for developing theassociated technology. However, such observation has been
limited to insulators to date. Recently, the metallic anttiferromagnets Mn3X have attracted significant attention for its
strong response (e.g. anomalous Hall effect) comparable
to ferromagnets owing to the hidden ferroic order, which
configures large Berry curvature originated from Weyl points
in a momentum space. Such ferroic order can be characterized by cluster magnetic octupoles based on neighbouring
magnetic moments, and thus it is highly important to clarify
the dynamics of cluster octupole for designing the spintronic
application. In this research, we conduct time-resolved
observation of spin-dynamics in a chiral antiferromagnet
Mn3Sn.
Bulk single-crystal D019-Mn3Sn has been employed.
Mn3Sn has the hexagonal Ni 3Sn-type crystal structure
consisting of an ABAB stacking of the kagome lattice of

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ISSP Activity Report 2020

Fig. 2. (a) Schematic diagram of the time-resolved polar MOKE
measurements (TR-MOKE). (b), (c) TR-MOKE signals of Mn3Sn
under a magnetic field of 2 T in the [2-1-10] direction. Backgrounds,
indicated by black curves in upper panels, were subtracted from the raw
data and plotted in the lower panels.

TR-MOKE signal is proportional to the surface normal
polarization of the cluster magnetic octupoles, the oscillating
Kerr signal should come from a change of size of the cluster
magntic octupole order.
Two oscillation modes I and II are found through theanalyses shown in Figs. 1(b) and 1(c), which should comefrom the dynamics of the cluster magnetic octupoles. The
mode I and II are assigned to the optical and collectiveprecession-like modes. From Fig. 1(c), we find that the
dynamics of the cluster octupole in Mn3Sn is enhanced byexchange interaction, and it is feasible to conduct an ultrafast
switching at < 10 ps, a hundred times faster than the case ofspin-magnetization in a ferromagnet. Moreover, our theoretical analysis with the aforementioned experimental resultsshows that the Néel type domain wall velocity in Mn3Sn canbe estimated as > 10 km/s, which is greater than the recently
reported value (~2 km/s) for the ferrimagnetic systems in thevicinity of the angular momentum compensation temperature[5]. Significantly, our study provides the first demonstrationof the time-resolved observation of the spin-wave oscillationin an antiferromagnetic metal.
References[1] S. Nakatsuji, N. Kiyohara, and T. Higo, Nature 527, 212 (2015).
[2] S. Tomiyoshi and Y. Yamaguchi, J. Phys. Soc. Jpn. 51, 2478 (1982).
[3] M.-T. Suzuki, T. Koretsune, and M. Ochi, Phys. Rev. B 95, 094406(2017).
[4] E. Beauprepaire et al., Phys. Rev. Lett. 76, 4250 (1996).
[5] K.-J. Kim et al., Nat. Mater. 16, 1187 (2017).
Authors
S. Miwa, S. Iihamaa, T. Nomotob, T. Tomita, T. Higo, M. Ikhlas, S.
Sakamoto, Y. Otani, S. Mizukamia, R. Aritab, and S. Nakatsuji
aTohoku University
bThe University of Tokyo

Low Gilbert Damping in Epitaxial
Thin Films of the Nodal-Line
Semimetal D03-Fe3Ga
Miwa and Nakatsuji Groups
D03-ordered Fe3Ga [Fig. 1(a)] is a nodal-line semimetaland shows a giant anomalous Nernst effect (ANE). The
origin of the ANE was attributed to the large density ofstates (DOS) and the large Berry curvature near the Fermi
level. The large Berry curvature emerges as a result of
spin-orbit-coupling-induced gap opening along the nodal
lines consisting of nearly flat valence and conduction bands
touching each other. This peculiar band structure may be
useful for spintronics device application because a gate
voltage may effectively modulate Berry-curvature-associatedresponses as well as magnetic anisotropy. In this regard, it
is important to characterize the magnetization dynamics of
D03-Fe3Ga. For such a purpose, we fabricated epitaxial thinfilms of D03-Fe3Ga and bcc-Fe and performed ferromagnetic
resonance (FMR) measurements to evaluate their Gilbert
damping constants.
50-nm-thick D03-Fe3Ga and Fe thin films were grown by
dc magnetron sputtering and molecular beam epitaxy, respectively. We confirmed that the D03-Fe3Ga layer was grown
epitaxially by performing high-energy electron diffraction and x-ray diffraction measurements. We conducted
FMR measurements using a vector network analyzer anda coplanar waveguide. We employed a field-modulation
technique [2], which measures the magnetic-field (H) deriva-

tive of the transmission coefficient ΔS21, to minimize fieldindependent background signals.
Figure 1(b) shows typical FMR spectra of the Fe3Ga
thin film taken with magnetic fields applied along the [001]direction. Here, a FMR spectrum refers to ΔS21 as a functionof magnetic field at a fixed frequency. From the FMR
spectra, we deduced the peak positions and peak widths,
which are shown in Figs. 1(c) and 1(d), respectively. We
fitted the Kittel formula to the FMR peak positions, and thefits are shown by solid curves in Fig. 1(c). We found that thein-plane cubic anisotropy H4// of Fe3Ga favors the magnetization along the [110] direction (H4// ~ −15 mT), while thoseof Fe and disordered Fe-Ga alloys favor the [100] direction(H4// ~ + 60 mT for Fe and H4// ~ + 75-100 mT for the Fe-Ga
alloys [3]). This magnetic-anisotropy change indicates thatthe D03 atomic ordering significantly alters the electronic
band structure of Fe-Ga alloys and induces the giant ANE asa result.
The FMR peak widths of the Fe and Fe3Ga thin films[Fig. 1(d)] showed linear behavior, the slope of whichcorresponds to the Gilbert damping constant. The linear
fits yielded the Gilbert damping constants of α = 0.0023 ±0.0002 for Fe and α = 0.0060 ± 0.0002 for D03-Fe3Ga. These
values are somewhat consistent with what is expected fromthe theoretical DOSs, indicating that Ga atoms do not significantly increase the spin-orbit coupling strength. Although theGilbert damping constant of D03-Fe3Ga is larger than that of
bcc-Fe, it is still low compared to typical ferromagnets suchas CoFeB (α ~ 0.004-0.006) [4] and Permalloy (α ~ 0.007)[5]. In other words, the nodal lines near the Fermi level
do not hinder the magnetization dynamics much. The low
Gilbert damping may be useful for spintronics device applications because one may be able to efficiently manipulate
the magnetization direction by exploiting the peculiar band
structure of D03-Fe3Ga.
In summary, we have investigated the magnetization dynamics of the epitaxial thin films of the nodal-line
semimetal D03-Fe3Ga by ferromagnetic resonance measurements. We have deduced the intrinsic Gilbert damping
constant of D03-Fe3Ga to be (6.0 ± 0.2) × 10−3, which isFig. 1. (a) Crystal structure of D03-Fe3Ga. (b) Typical Ferromagnetic
resonance (FMR) spectra of D03-Fe3Ga. (c) Resonance frequency
plotted against resonance magnetic fields. The solid curves are thefits using the Kittel formula. (d) FMR peak widths of D03-Fe3Ga andbcc-Fe. The solid lines represent the linear fits, the slope of which
represents the intrinsic Gilbert damping constant.

ISSP Activity Report 202021

larger than the Fe Gilbert damping constant of (2.3 ± 0.2)
× 10−3 but as low as other typical ferromagnets. The low
Gilbert damping and the peculiar band structure with a large
Berry curvature make D03-Fe3Ga attractive as a building
block of spintronics devices.
References[1] A. Sakai, S. Minami, T. Koretsune, T. Chen, T. Higo, Y. Wang,
T. Nomoto, M. Hirayama, S.Miwa, D. Nishio-Hamane, F. Ishii,
R. Arita, and S. Nakatsuji, Nature 581, 53 (2020).
[2] S. Tamaru, S. Tsunegi, H. Kubota, and S. Yuasa, Rev. Sci. Instrum.
89, 053901 (2018).
[3] S. Budhathoki, A. Sapkota, K. M. Law, B. Nepal, S. Ranjit,
S. KC, T. Mewes, and A. J. Hauser, J. Magn. Magn. Mater. 496,
165906 (2020).
[4] A. Conca, J. Greser, T. Sebastian, S. Klingler, B. Obry, B. Leven,and B. Hillebrands, J. Appl. Phys. 113, 213909 (2013).
[5] Y. Zhao, Q. Song, S.-H. Yang, T. Su, W. Yuan, S. S. P. Parkin, J.
Shi, and W. Han, Sci. Rep. 6, 22890 (2016).
Authors
S. Sakamoto, T. Higo, S. Tamarua, H. Kubotaa, K. Yakushijia, S.
Nakatsuji, and S. Miwa
aNational Institute of Advanced Industrial Science (AIST)

Textbook Renormalization Group
Prescription in Tensor-Network Language
Kawashima Group
Kadanoff’s block-spin method gives a simple physicalpicture for the general RG transformations. Combined with
Migdal’s bond-moving trick, it serves as the first approximation that allows us direct estimation of the critical exponents,
though the accuracy may not be satisfactory in many cases.
However, it is not obvious how we can systematically
improve on it so that eventually we can obtain, at least in
principle, estimates as accurate as we like. Modern tensornetwork (TN)-based methods, such as tensor renormalization group (TRG), tensor network renormalization (TNR),
loop-TNR, high-order TRG (HOTRG), etc, opened up new
possibilities for the RG transformations. Generalizing theconventional real-space RG (RSRG) transformations, they
are more versatile and, more importantly, systematically
improvable. The free energy, the energy, the magnetization, or any other locally defined order parameters can becomputed by one of those methods. As for the estimationof the scaling dimensions, the CFT-based transfer-matrix
method based on the conformal-field theory has been widelyused for two-dimensional classical systems. For higher
dimensions, however, the only method generally applicable

Fig. 2. The scaling dimensions of the 2D Ising model obtained directlyfrom the linearized RG plotted against the number of RG steps appliedat the critical point. The flat region represents the fixed point values.

was to esimate the correlation functions and apply the finitesize scaling to them. This indirect method may be good for
obtaining one or two scaling dimensions, but it is obviously
not a systematic way for obtaining a series of scaling dimensions.
Conceptually, it is straight-forward to construct a method
for obtaining the series of scaling dimensions from any
RSRG method. Simply we can expand the renormalized
tensor with respect to the preceding tensor, i.e., the tensor
at one RG step before the current one (Fig. 1). At the fixed
point, the linear term would produce the scaling dimensions as its eigenvalues. This is exactly what we learn fromtextbooks for obtaining the scaling dimensions, in manycases with the Migdal-Kadanoff (MK) approximation as
an example. In the MK approximation for the Ising model,
we have only two independent fields, and it is impossible
to obtain more than two scaling dimensions, whereas in
the general TN-based method, we have as many fields as
we like and, accordingly, we can in principle obtain manyscaling dimensions systematically from the same calculation.
However, it has been hard to carry out this straight-forward
textbook program in practice because of the influence of theshort-range entanglement.
In the paper [1], we adopted the graph-independent
local truncation (GILT) method to eliminate the short-range
entanglement. This made it possible to fully exploit the RG
interpretation of various tensor-network-based methods
and show a way to carry out the above-mentioned textbook
RG prescription in the TN language: identify a fixed point,
linearize the RG equation around this fixed point, anddiagonalize it to obtain scaling dimensions. For the RSRG,
we used HOTRG though it is not the only possible choice.
As shown in Fig. 2, our benchmark calculation on the 2Dclassical Ising model shows that the proposed method works
equally well compared with the above-mentioned CFT-basedtransfer matrix. The advantage of the present scheme is its
potential applications to 3D systems, where the CFT-based
method is inapplicable.
Reference[1] X. Lyu, R. G. Xu, and N. Kawashima, Phys. Rev. Research 3,023048 (2021)

Fig. 1. Schematic diagram of the linearized tensor RG equation "R". In
the proposed method, it can be generated using automatic differentiation once the coarse graining is implemented.

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ISSP Activity Report 2020

Authors
X. Lyu, R. G. Xua, and N. KawashimaaThe University of Tokyo

Weak Ferromagnetism and Possible
Non-Fermi Liquid Behavior in Itinerant
Electronic Material Co3SnC
Uwatoko GroupIn Fermi-liquid (FL) theory, the quasiparticle (QP)
approximation and the generalized Boltzmann equation
can describe the collective behaviors of strongly correlated
multi-electron systems. For magnetic materials, strong
magnetic correlations usually induce large changes in the
QP-QP interactions, which make the QPs behave abnormally. Especially, when approaching the magnetic quantum
critical point (QCP), various pronounced deviations from theLandau FL behaviors appear, e.g., non-Fermi liquid (NFL)and strong enhancement of the QP effective mass. On theseissues, many correlated electronic materials including theheavy fermion (HF) systems have been studied throughtuning the magnetic orders by strengthening the hybridizations between the 4f and conduction electrons and/or
enhancing the magnetic correlations via external parameters.
These studies are helpful to reveal the intrinsic characteristics of the competing electronic orders near QCPs.
Cobalt-contained materials are such alternatives to
explore exotic QCPs owing to the various spin statesof cobalt ions and their strong response to the external
stimuli. Especially for those materials with both localized
and itinerant electrons, the varieties of magnetic transition and phase diagram are more interesting. Metallic
perovskite M3M’X (M is transition metals; M’ is the maingroup elements; X is C, N) is such an example with diversified crystal structures and magnetic phase transitions. But
the intrinsic magnetic interaction in M3M’X is controversial although various classical models were proposed. One
possible reason for the absence of the universal theoreticalmodel is that the system is not limited to the simple localized
and/or itinerant interactions. Some reports have argued thatthese materials are close to the boundary of the localized anditinerant ferromagnetism and thus can be taken as an excellent platform to study the crossover between them. Amongthem, Co3M’X could be a good example to clarify theseissues considering its unstable magnetic ground state andFig. 2. Phase diagram and field-dependence of characteristic parameters for Co3SnC: (a) TFL; (b) the color shows its change tendency ofd(M2)/d(H/M) vs. H which is proportional to the magnitude of magnetic
fluctuations.

the abnormal quantum behaviors are expected by applying
non-thermodynamic parameters.
In this study, weak ferromagnetism and NFL behaviors
were observed in Co3SnC via measurements of magnetic
properties, electrical transport and specific heat undermagnetic fields. Magnetic measurements suggest that it
undergoes a paramagnetic to itinerant ferromagnetic phasetransition with NFL behaviors including the power-law
temperature dependence of resistivity, the -T logT-dependent
upturn in specific heat, and the T 4/3-dependence of inverse
susceptibility. With increasing the magnetic fields, thetemperature coefficient of T 2-term in resistivity follows a(H-Hc)-0.5-divergence upon approaching the critical field Hc,
apart from the 1/(H-Hc)-dependence with the whole Fermi
surface under the singular scattering. The exponent n in thetemperature dependence of resistivity shows an increase
from n = 1.0 to 2.0 with increasing the field above Hc as
the evidence for the field-induced crossover from NFL to
FL behavior; the relative mass enhancement factor λ(H)/λ(0) reduce to nearly 60% at 9.0 T, indicating the gradualsuppression of magnetic fluctuations and electron-electron
scattering. The results indicate that Co3SnC is a good candidate for exploring itinerant quantum magnetic QCP.
Reference[1] B. S.Wang, Y. Uwatoko, J. -G. Cheng, and Y. P. Sun, Phys. Rev. B.
102, 085153 (2020)
Authors
B. S. Wanga, Y. Uwatoko, J.-G. Chenga and Y. P. Sunb,caInstitute of Physics, CAS
bHigh Magnetic Field Laboratory, CAS
cInstitute of Solid State Physics, CAS

Pattern Formation Induced by
Mechanochemical Coupling of ReactionDiffusion and Membrane Deformation
Noguchi Group

Fig. 1. (a) Δρ(T) vs. T 2 in a log-log scale; the arrow shows the crossover from T- to T 2-dependence. (b) Field-dependence of TFL; thearrow shows the critical field; field dependence of the parameters: (c)ρ0; (d) A and the exponential fitting results by the (H-Hc)-0.5 (the redsolid line); (e) n; the arrows in (c)-(e) indicate the change tendency andguides to the eye.

Shapes of biological membranes are dynamicallyregulated in living cells. Although membrane shape deformation by proteins at thermal equilibrium has been extensively studied, nonequilibrium dynamics have been muchless explored. Recently, chemical reaction propagation has
been experimentally observed in plasma membranes. Thus,
it is important to understand how the reaction-diffusion
dynamics are modified on deformable curved membranes.

ISSP Activity Report 202023

Structures and Dynamics of Hydrogen
Cluster Materials Li5MoH11 andLi6NbH11
Yamamuro Group

Fig. 1. Snapshots of vesicles with Turing patterns. Top panel: multispindle shapes. Bottom panel: budded vesicles. Color indicates theconcentration of the curvature-inducing protein.

Fig. 2. Sequential snapshots of a shape-oscillation vesicle. Budding
repeatedly occurs, accompanied by the propagation wave. Color
indicates the concentration of the curvature-inducing protein.

In this study, we present nonequilibrium pattern formation
on vesicles induced by mechanochemical feedback between
membrane deformation and chemical reactions, using
dynamically triangulated membrane simulations combinedwith a modified Brusselator model that is one of the simplest
reaction-diffusion models. Two proteins (curvature-inducing
and regulatory proteins) bind to the membrane. We foundthat membrane deformation changes stable patterns relative
to those that occur on a non-deformable curved surface, as
determined by linear stability analysis [1]. Temporal oscillation of the protein concentration can be changed into Turing
pattern (stable spatial patterns). Budding and multi-spindle
shapes are also induced by Turing patterns as shown in Fig. 1.
We also found that the propagating wave patterns change
into non-propagating patterns and spiral wave patterns dueto the mechanochemical effects [2]. Moreover, the wave
speed is positively or negatively correlated with the local
membrane curvature depending on the spontaneous curvature and bending rigidity. In addition, self-oscillation of thevesicle shape occurs, associated with the reaction-diffusion
waves of curvature-inducing proteins as shown in Fig. 2.
This agrees with the experimental observation of GUVs witha reconstituted Min system, which plays a key role in thecell division of Escherichia coli. Our results demonstrate theimportance of mechanochemical feedback in pattern formation on deforming membranes.

In the current research field of batteries, there are strong
demands for high-performance hydrogen storage materials
and ionic (H+, Li+, etc.) conductors. Recently, a series ofnovel materials Li5MoH11, Li5WH11, Li6NbH11, Li6TaH11
which contain unusual ninefold hydrogen-coordinatedclusters MH9 (M= Mo, W, Nb, Ta), whose structure is shownin the inset of Fig. 1, were synthesized by Orimo group in
Tohoku University [1]. These are of interest since they havehigh hydrogen density and possible high Li ionic conductivity. The dynamics of MH9 cluster may play importantroles in determining the physical properties of the materials.
We have performed the neutron powder diffraction (NPD)
and quasielastic neutron scattering (QENS) experiments of
Li5MoH11 and Li6NbH11.
Both samples were synthesized from solid-state reactions
under high pressure (ca. 5 GPa) and high temperature (ca.
700 K). Owing to these difficulties, the sample amounts of
Li5MoH11 and Li6NbH11 were 33 mg and 20 mg, respectively. The NPD and QENS measurements were conductedusing high intensity total diffractometer NOVA (BL21) andbiomolecular dynamic spectrometer DNA (BL02) in MLF,
J-PARC, respectively. The DNA data were collected withboth high and low energy resolution modes.
From the Rietveld analyses for the NPD data at room
temperature, we have checked the purity of the samples(Li5MoH11: 75 %, Li6NbH11: 57 %) and confirmed that theMH9 clusters are orientationally disordered. Figure 1 shows
the intermediate scattering functions of Li5MoH11. Similar
data were obtained also in Li6NbH11. Relaxation phenomena
were observed in a wide temperatures range between 150 K
and 300 K. It is quite unusual that the relaxation occurs ina wide time range over 3 orders of magnitude as shown inthe data at 300 K. Therefore, the data were fitted with not an
exponential but Kohlraush-Williams-Watts (KWW) function
I(Q,t) = a(Q) + b(Q)exp[–(t/τKWW)β],where Q is magnitude of a scattering vector, t is a time,
τKWW is a relaxation time, β is a non-exponential parameter,
and a(Q) and b(Q) are elastic and relaxation components,
respectively. The β parameter (0 < β < 1) reflects the width

References[1] N. Tamemoto and H. Noguchi, Sci. Rep. 10, 19582 (2020).
[2] N. Tamemoto and H. Noguchi, Soft Matter 17, 6589 (2021).
Authors
N. Tamemoto and H. Noguchi
Fig. 1. Intermediate scattering functions (Q = 1.53 Å-1) of Li5MoH11
measured at several temperatures between 150 K and 300 K. The solid
curves are fitting curves to the KWW functions with β = 0.38. The inset
shows the structure of the MH9 cluster.

24

ISSP Activity Report 2020

Fig. 2. Elastic Incoherent Structure Factor (EISF) obtained at 300 K for
Li5MoH11 and Li6NbH11. The solid curves are the fitting curves to theequation in the figure.

of the relaxation time distribution; no distribution at β = 1.
The fittings were satisfactory as shown by solid curves inFig. 1. The determined β were 0.38 for Li5MoH11 and 0.33
for Li6NbH11, indicating that the distribution of the relaxation time is very wide; cf. β is around 0.5 for glass forming
liquids. The activation energies obtained from the temperature dependence of the relaxation times were 15 kJmol–1 for
Li5MoH11 and 27 kJmol–1 for Li6NbH11. The magnitude of
the activation energy may depend on the ionic valence andsize (M-H distance) of the hydrogen cluster (MoH93-: 1.76
Å, NbH94-: 1.86 Å) .
Figure 2 shows the Q dependence of EISF (Elastic
Incoherent Scattering Factor) which is defined by EISF =a(Q)/[a(Q) + b(Q)]. As shown by the solid curves in Fig. 2,
EISF was well fitted by
EISF = 1 – A + Aj02(QR),
where j0(QR) is a 0th order sphere Bessel function with aradius R. This indicates that MH9 clusters are sphericallyrotating at 300 K, which is consistent with the structural
information. The rotational states of the MH9 clusters are
now investigated with a first-principle MD simulation
technique. We guess that the wide distribution of the relaxation time is associated with the positional disorder of Liions conducting in the crystals.
This work is financially supported by JSPS KAKENHI
No. JP 18H05513 and JP18H05518.
Reference[1] S. Takagi, Y. Iijima, T. Sato, H. Saitoh, K. Ikeda, T. Otomo,
K. Miwa, T. Ikeshoji, and S. Orimo, Sci. Rep. 7, 44253 (2017).
Authors
Y. Ohmasa, H. Akiba, S. Takagia, S. Orimoa, H. Saitob, T. Yamadac,
Y. Kawakitad, K. Ikedae, T. Otomoe and O. YamamuroaTohoku University
bQST
cCROSSdJAEA
eKEK

magnetic anisotropy, exchange randomness, and site dilution.
These thus play key roles in determining ground states infrustrated magnets. The equilateral triangular spin tube
antiferromagnet CsCrF4 [1,2] is a candidate for realizing
a ground state sensitive to small perturbations. Magnetic
Cr3+ ions having S = 3/2 form triangular spin tubes along
the crystallographic c axis, as illustrated in Fig. 1. The tubes
couple magnetically with one another and form the kagometriangular lattice in the ab plane [3]. Neutron powder diffraction study conducted by our group identified long-range
magnetic order below 2.8 K [4]. The magnetic moments
form a quasi-120° structure in the ab plane. It is unique thatthe 120° structure propagates antiferromagnetically along
the a and c axes with a magnetic propagation vector kmag =(1/2, 0, 1/2). Discussion of ground states in the kagometriangular lattice model suggested that the ground stateof CsCrF4 is close to the boundary on the magnetic phase
diagram in the kagome-triangular lattice model [4]. This
proposes that small perturbations may induce various typesof magnetic states in CsCrF4.
To introduce small perturbations into CsCrF4, we investigate chemical substitution effect. A magnetic Fe-substituted CsCr1-xFexF4 showed long-range magnetic order andenhancement of magnetic anisotropy [5]. In a nonmagnetic
Al-substituted CsCr1-xAlxF4, a weak feature of magnetic
ordering was observed [5]. Hereby, we report chemical
substitution effects on the magnetic ground state in CsCrF4[6].
We carried out neutron powder diffraction experiments on CsCr0.94Fe0.06F4 and CsCr0.98Al0.02F4. In bothcompounds, magnetic Bragg peaks indicative of thelong-range magnetic order are clearly observed, as
shown in Fig. 2. Most strikingly, the magnetic peaks in
CsCr0.94Fe0.06F4 are indexed by a propagation vector kmag =(0, 0, 1/2), which is different symmetry from kmag = (1/2, 0,1/2) in the parent CsCrF4. Magnetic structure analysis identifies that the 120° structure does not alternate in the ab plane,
whereas the intratube structure is the same as in CsCrF4.
Based on the Goodenough-Kanamori rule on superexchangeinteractions [7,8], it is predicted that ferromagnetic (antiferromagnetic) interactions between the Cr3+ ions via the Fions turn into antiferromagnetic (ferromagnetic) interactions
by the Fe3+ ion substitution, namely bond substitution. The
identified magnetic structure, thus, means that the bondsubstitution by the magnetic Fe3+ ion modifies the intertube
structure, but the intratube structure is intact.
On the contrary, in CsCr 0.98 Al 0.02 F 4 the observed
magnetic peaks are indexed by the same propagation vector
as in the parent CsCrF4. Analyzing the magnetic structure,

Magnetic Order in the Chemically
Substituted Frustrated
Antiferromagnet CsCrF4
Masuda GroupIn geometrically frustrated magnets, macroscopicallydegenerated ground-states in low-energy regime can besolved by small perturbations. This tells us that magnetic
states at low temperatures highlights small effects such as

Fig. 1. Schematic view of the crystal structure of CsCrF4. Red lines
a indicate the nearest-neighbor interaction along the c axis. Blue andyellow lines indicate the nearest- and second-neighbor interactions in
the ab plane.

ISSP Activity Report 202025

Zero-Energy Excitation in the ClassicalKagome Antiferromagnet NaBa2Mn3F11
Masuda Group

Fig. 2. Neutron diffraction profiles for (a) CsCr0.94Fe0.06F4 and (b)CsCr0.98Al0.02F4 at 1.5 K. Red circles and black curves show the experimental data and simulations, respectively. Vertical bars and triangles
indicate the position of the nuclear and magnetic Bragg peaks. Blue
curves show the difference between the data and simulations. Insets are
the determined magnetic structures.

we find that the spin configuration in CsCr0.98Al0.02 is notchanged drastically, even though a relative angle between
three spins in the 120° structure deviates more from 120°
than that in CsCrF4. Since substituting the Cr3+ ion with the
Al3+ ion creates a spin vacancy, trigonal symmetry of the120° structure is locally broken. However, the spin vacancy
only produces a small effect on the ground state of CsCrF4,
and therefore the quasi-120° structure is still realized
globally in CsCr0.98Al0.02F4.
In conclusion, we have studied magnetic orders inmagnetic Fe- and nonmagnetic Al-substituted CsCrF 4
through the neutron powder diffraction experiment. The
magnetic structure analysis reveals that the Fe-substituted
sample exhibits a 120° structure having kmag = (0, 0, 1/2),
and the Al-substituted one has a quasi-120° structure having
kmag = (1/2, 0, 1/2). Importantly, the magnetic structure in
CsCr0.94Fe0.06F4 differs from that in the parent CsCrF4. This
result concludes that the ground state in CsCrF4 is moresensitive to magnetic substitution rather than nonmagnetic
one on the Cr site.

Localization of spin-wave excitations, so-called zeroenergy mode, is one of the unique phenomena in geometrically frustrated magnets [1]. Largely degenerate groundstates allow a continuous rearrangement of spins with noenergy cost, generating a dispersionless mode in a spin-wave
excitation spectrum. The classical kagome antiferromagnet
is a prototypical model for the dispersionless mode in the
spin-wave excitations. It has an infinite degeneracy of 120°
structures in the ground state. This degeneracy allows acontinuous change of the spin arrangement with no energy
cost, as illustrated in Fig. 1(a).
In real kagome antiferromagnets, the macroscopic
degeneracy of the 120° structures is solved by some typesof magnetic anisotropy such as the Dzyaloshinskii-Moriya
interaction, single-ion anisotropy, and magnetic dipoledipole interaction. Then, the zero-energy mode becomesvisible as an excited state lifted by those anisotropies.
Although the zero-energy mode is one of the most characteristic phenomena in frustrated kagome antiferromagnets, it
has been reported only in KFe3(OH)6(SO4)2 [2]. Therefore,
further study in different materials is highly desirable.
Our target material, a classical kagome antiferromagnet
NaBa2Mn3F11 [3], is a promising candidate exhibiting thezero-energy mode. Mn2+ ions having spin S = 5/2 are responsible for magnetic properties. Neutron powder diffraction
demonstrated that antiferromagnetic order below TN = 2 K
forms the 120° structure selected by the magnetic dipolarinteraction [4], as shown in Fig. 1(a). According to theoretical studies, the zero-energy mode in the classical kagome
antiferromagnet with the magnetic dipolar interaction ispredicted to emerge at its lowest excited state [5], as shownin Fig. 1(b). Hereby, we report the zero-energy mode excitation in NaBa2Mn3F11 through a combination of inelastic
neutron scattering technique and linear spin-wave calculations [6].
Figures 2(a)-2(d) show a temperature variation of theinelastic neutron scattering spectra for a powder sample of
NaBa2Mn3F11. Magnetic diffuse scattering indicative ofshort-range correlation is observed at 30 K in the paramagnetic phase [Fig. 2(d)]. The diffuse scattering is suppressedwith decreasing temperature, and the spectrum splits into
two parts: strong intensity at 0.2 meV and weak intensity at
1.5 meV [Figs. 2(a)-2(c)]. In the magnetic ordered state at
1.5 K, spin-wave excitations having a magnetic anisotropy

References[1] H. Manaka et al., J. Phys. Soc. Jpn. 78, 093701 (2009).
[2] H. Manaka et al., J. Phys. Soc. Jpn. 80, 084714 (2011).
[3] K. Seki and K. Okunishi, Phys. Rev. B 91, 224403 (2015).
[4] M. Hagihala et al., npj Quantum Mater. 4, 13 (2019).
[5] H. Manaka et al., J. Phys. Soc. Jpn. 88, 114703 (2019).
[6] S. Hayashida, M. Hagihala, M. Avdeev, Y. Miura, H. Manaka, andT. Masuda, Phys. Rev. B 102, 174440 (2020).
[7] J. B. Goodenough, Phys. Rev. 100, 564 (1955).

[8] J. Kanamori, J. Phys. Chem. Solids 10, 87 (1959).

Authors
S. Hayashida, M. Hagihalaa, M. Avdeevb, Y. Miurac, H. Manakad, andT. MasudaaHigh Energy Accelerator Research Organization (KEK)
bAustralian Nuclear Science and Technology Organisation (ANSTO)
cSuzuka National College of Technology
dKagoshima University

26

ISSP Activity Report 2020

Fig. 1. (a) Magnetic structure having k = 0 of NaBa2Mn3F11. The redarrows represent directions of spins. Dashed loops illustrate the zeroenergy mode as described in the text. Solid and dashed lines are thenearest-neighbor and second-neighbor paths, respectively. (b) Spinwave excitation having the nearest-neighbor exchange interaction J1
and magnetic dipole-dipole interaction JMDD = J1/100. The energy isnormalized by the magnitude of J1 and spin S.

[5] M. Maksymenko, R. Moessner, and K. Shtengel, Phys. Rev. B 96,
134411 (2017).

[6] S. Hayashida, H. Ishikawa, Y. Okamoto, T. Okubo, Z. Hiroi,
G. J. Nilsen, H. Mutka, and T. Masuda, Phys. Rev. B 101, 214409(2020).
Authors
S. Hayashida, H. Ishikawa, Y. Okamotoa, T. Okubob, Z. Hiroi, G. J.
Nilsenc, H. Mutkad, and T. Masuda
aNagoya University
bThe University of Tokyo
cISIS Neutron and Muon Source
dInstitute Laue LangevinFig. 2. Inelastic neutron scattering spectra of NaBa2Mn3F11 at (a)1.5 K, (b) 2.0 K, (c) 5 K and (d) 30 K. The incident neutron energy is
Ei = 3.1 meV. Calculated spin-wave spectra with (e) J1 = 0.28 meV,J2 = 0, and JMDD = 4.9 μeV and with (f) J1 = 0.27 meV, J2 = J1/10, andJMDD = 4.9 μeV. Solid and dashed curves in (e) and (f) are spin-wave
dispersions along [1 0 0] and [1 1 0] directions, respectively.

gap of 0.21 meV is observed, as shown in Fig. 2(a). Notably,
the excitation at 0.21 meV does not shift on varying wave
number Q. This suggests that the excitation is a dispersionless zero-energy mode lifted by the magnetic dipolar interaction.
To identify if the observed dispersionless mode indeed
originate from the magnetic dipolar interaction, we simulated
the spin-wave excitation spectra in the linear spin-wave
theory with considering the nearest-neighbor exchange interaction J1, the second neighbor exchange interaction J2, andthe nearest-neighbor magnetic dipolar interactions JMDD.
Figures 2(e) and 2(f) show powder-averaged spin-wave
spectra in J1-JMDD and J1-J2-JMDD models, respectively.
The calculated spectra semi-qualitatively reproduce thelow-energy strong excitation and high-energy weak excitation. Importantly, the calculated spectrum shows that thesecond-neighbor interaction J2 makes the zero-energy excitation dispersive (Fig. 2(f)), because further neighboring interactions suppress the continuous rearrangement of the spinswith no energy cost. This means that the observed dispersionless excitation at 0.2 meV indicates that J2 is negligible
in NaBa2Mn3F11.
The most remarkable finding is that the energy positionof the dispersionless mode is reproduced solely by themagnetic dipolar interaction. We note that the magnetic
dipolar interaction is ubiquitous in every real magnet eventhough the qualitative behavior of most kagome antiferromagnet can be explained by models including only thenearest-neighbor interaction. Therefore, we come to theconclusion that the observed dispersionless excitation in
NaBa2Mn3F11 is the ideal zero-energy mode in the realisticclassical kagome antiferromagnet.
In summary, we discovered a dispersionless zero energy
mode in the classical kagome antiferromagnet NaBa2Mn3F11
by the inelastic neutron scattering technique. The calculations based on the linear spin-wave theory reveal that theexcitation is described by the zero-energy mode lifted solely
by the magnetic dipole-dipole interactions. NaBa2Mn3F11 isa unique classical kagome antiferromagnet exhibiting a truly
dispersionless lifted zero-energy excitation.
References[1] A. B. Harris, C. Kallin, and A. J. Berlinsky, Phys. Rev. B 45, 2899
(1992).
[2] K. Matan et al., Phys. Rev. Lett. 96, 247201 (2006).
[3] H. Ishikawa et al., J. Phys. Soc. Jpn. 83, 043703 (2014).
[4] S. Hayashida et al., Phys. Rev. B 97, 054411 (2018).

Spin Density Wave Induced by Bound
Two-Magnon in S = 1/2 Frustrated
Chain Compound NaCuMoO4(OH)
Masuda Group
Frustrated magnetism has attracted great attention
because of nontrivial phases induced by the lift of macroscopic degeneracy. One of the interesting examples isfound in S = 1/2 one-dimensional spin system with nearestneighbor ferromagnetic and next-nearest-neighbor antiferromagnetic interactions [1]. A theory predicts that a boundtwo-magnon in high magnetic field induces exotic phasescharacterized by the spin-density-wave (SDW) and spin
multipole correlations in the frustrated ferromagnetic chain[2]. So far, these states have not been fully investigated byspectroscopic method because of high saturation field and/or difficulty of obtaining a large single crystal for existingmodel compounds. NaCuMoO4(OH) is an experimental
realization of the system having decent energy scale, saturation field of 26 T [3] which is available on the pulse magnet
for neutron scattering [4]. The synthesis of a single crystal

Fig. 1. Contour maps of neutron intensities in the (0kl) plane around thereciprocal lattice point (0, δ, 0) at 0.1 K under the magnetic field of (a)0 and (b) 4.5 T.

ISSP Activity Report 202027

aInstituteof Multidisciplinary Research for Advanced Materials,
Tohoku University
bResearch Center for Neutron Science and Technology, Comprehensive
Research Organization for Science and Society
cInstitute of Quantum Beam Science, Ibaraki University
dHigh Energy Accelerator Research Organization

Neutron Resonance Spin Echo
Measurements on the Magnetic
Skyrmion Lattice State in MnSi
Nakajima Group
Fig. 2. Value of δ as a function of field

was reported [5]. The NMR and heat capacity study suggest
a magnetic transition at Hc of 1.5 - 1.8 T [3]. For the full
identification of the magnetic states in zero and finite fields
neutron diffraction technique is indispensable. We hereby
report the magnetic structure analysis by using the time-offlight neutron diffractometer SENJU installed at J-PARC [6]on a single crystal NaCuMoO4(OH).
Figure 1(a) and 1(b) shows the contour maps of neutron
intensities in the (0kl) plane around the reciprocal lattice
point (0, δ, 0) at 0.1 K under the magnetic field of (a) 0 and(b) 4.5 T. We found that the peak indicated by the blue arrow
in Fig. 1(a) appear at (0, δ, 0) (δ ~ 0.48) below the transition
temperature of 0.6 K. It means that the peak comes fromthe magnetic origin. We further found peaks at (1 δ 1) and(0 δ 2). Magnetic structure analysis reveals that the properscrew structure with the ferromagnetic interchain couplingwith the propagation vector of (0, δ, 0) is realized at zero
field. Furthermore, we found that the magnetic peak at (0 δ 0)
was shifted to smaller k direction by applying a magnetic
field as shown in Fig. 1(b). This behavior suggests that thefield induces SDW state, in which the density correlation ofbound magnon is developed and its incommensurability isrepresented in terms of magnetization. In Fig. 2 the value ofδ is independent of the field below Hc, and it decreases withincreasing the field above Hc. The negative slope of the line
above Hc indicated by red line is consistent with the theoretical prediction for the SDW2 state [7]. The result demonstrates that the bound two-magnon leads to the SDW state inhigh magnetic field in the compound.

Magnetic skyrmions are vortex-like spin objects, which
can be regarded as topological defects composed of magnetic
moments in a magnetic material [1]. They were discovered in a small phase pocket in the vicinity of the criticaltemperature in chiral cubic magnets; previous small-angle
neutron scattering (SANS) [2] and Lorentz transmission
electron microscopy [3] measurements have revealed thatthe magnetic vortices are arranged to form a triangular lattice
on a plane perpendicular to an applied magnetic field. It isalso reported that the magnetic skyrmions can be driven byflowing an electric current [4]. These observations showthat magnetic skyrmions behave like particles once they areformed, while it remains unclear how the particle character
emerges upon the phase transition from the paramagnetic(PM) phase to the skyrmion lattice (SkL) phase.
In the present study, we investigate the PM-to-SkL transition in an archetypal skyrmion compound MnSi by means ofneutron spin echo (NSE) spectroscopy [5], which is suitedfor probing diffusive dynamics with the time scales of theorder of pico- to submicroseconds. Actually, spin fluctuations in MnSi were studied by means of polarimetric andferromagnetic NSE measurements [6], in which the Larmor
precession of polarized neutron spin is utilized for detecting
very small changes in neutron velocity upon quasi-elastic
scattering processes. However, neither the polarimetric nor
ferromagnetic NSE is suited for the SkL phase. The former
is limited to zero-field measurements. Although the latter
is applicable for in-field measurements, the non-collinear

References[1] S. Furukawa, M. Sato, and S. Onoda, Phys. Rev. Lett. 105, 257205(2010).
[2] T. Hikihara, L. Kecke, T. Momoi, and A. Furusaki, Phys. Rev. B 78,
144404 (2008).
[3] K. Nawa, Y. Okamoto, A. Matsuo, K. Kindo, Y. Kitahara,
S. Yoshida, S. Ikeda, S. Hara, T. Sakurai, S. Okubo, H. Ohta, and
Z. Hiroi, J. Phys. Soc. Jpn. 83, 103702 (2014).
[4] H. Nojiri, S. Yoshii, M. Yasui, K. Okada, M. Matsuda, J. -S. Jung,
T. Kimura, L. Santodonato, G. E. Granroth, K. A. Ross, J. P. Carlo, andB. D. Gaulin, Phys. Rev. Lett. 106, 237202 (2011).
[5] K. Nawa, Y. Okamoto, and Z. Hiroi, J. Phys.: Conf. Ser. 828,
012005 (2017).
[6] T. Ohhara, R. Kiyanagi, K. Oikawa, K. Kaneko, T. Kawasaki,
I. Tamura, A. Nakao, T. Hanashima, K.Munakata, T. Moyoshi,
T. Kuroda, H. Kimura, T. Sakakura, C.-H. Lee, M. Takahashi, K.-i.
Ohshima, T. Kiyotani, Y. Noda, and M. Arai, J. Appl. Cryst. 49, 120(2016).
[7]. M. Sato, T. Momoi, and A. Furusaki, Phys. Rev. B 79, 060406(R)(2009).
Authors
S. Asai, T. Oyama, K. Nawa a , A. Nakao b , K. Munakata b , K.
Kuwaharac, M. Hagihalad, S. Itohd, Z. Hiroi, and T. Masuda

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ISSP Activity Report 2020

Fig. 1. [(a)-(c)] Intensities of scattered neutrons projected on the Qx-Qy
plane measured at (a) 29.00, (b) 28.75, and (c) 27.50 K. on cooling.
[(d)-(f)] I(Q,t) profiles at each temperature.

spin arrangement of the SkL leads to mixing of spinflip and non-spin-flip scatterings, which depolarizes theneutron spins. We thus employ neutron resonance spinecho technique, specifically the modulation-of-intensitywith-zero-effort (MIEZE) method, in which the intermediate
spin correlation function I(Q,t) = S(Q,t)/S(Q,0), where S(Q,t)
is the temporally Fourier transformed dynamical structure
factor, is obtained not from the final neutron spin polarization after experienced the precessions mentioned above, butfrom beating patterns appearing in intensities of scatteredneutrons as a function of time. Since the MIEZE signals
are independent of the spin state of scattered neutrons, thistechnique is suited for measuring magnetic scattering in amagnetic field [7].
In Figs. 1(a)-1(c), we show typical SANS patterns
measured in a magnetic field of 0.21 T at the VIN ROSE
instrument in the materials and life science experiment
facility in J-PARC. We observed a ring-like diffuse scattering
pattern at 29 K, which is slightly above the critical temperature of 28.8 K (Fig. 1(a)). This indicates that a short-range
isotropic spin correlation is developing in the sample. As thetemperature is lowered, a Bragg peak emerges and coexists
with the ring-like diffuse scattering (Fig. 1(b)). Finally,
the diffuse scattering completely disappears and only the
Bragg peak remains at 27.5 K (Fig. 1(c)). We obtained I(Q,t)
profiles of the diffuse and Bragg scattering components asshown in Figs. 1(d)-1(f). The I(Q,t) profile at 29 K shows adecay, which is well described by a single-exponential decayfunction, revealing that the magnetic moments involved in
the diffuse scattering are fluctuating with a characteristic
time of 1 ns. By contrast, no temporal decay of the spincorrelation is found at 27.5 K (Fig. 1(f)). At the intermediate temperature where the Bragg and diffuse scattering
coexist, the I(Q,t) profile for the diffuse component stillshows a decay, while that for the Bragg peak is approaching
unity. This demonstrates that the isotropic spin fluctuations
with short-range spin correlations coexists with static SkL
domains near the boundary between the PM and SkL phases.
We also analyzed the I(Q,t) values as a function of azimuthal
angle, and concluded that an aggregation of the magnetic
skyrmions upon cooling leads to orientational disorderof the small SkL domains. This picture is consistent withthe particle-like character of the magnetic skyrmions. The
present results also show that the MIEZE-type NSE at VIN
ROSE is a powerful tool to study spin dynamics of magnetic
skyrmion systems, for which measuring spin dynamics in
low-Q regions in a magnetic field is essential.

Dynamics Fracture Behaviorsof Slide-Ring Gels
Mayumi Group
Tough hydrogels have been attracting a lot of interest
because of their potential application for biomaterials. To
improve the mechanical strength of hydrogels, various
chemical design of polymer networks have been proposedin the last two decades. One of the promising strategies totoughen gels is to introduce weak “sacrificial” crosslinks
into polymer networks [1]. The sacrificial bonds in toughpolymer gels are broken under deformation, and a part of
input mechanical energy is dissipated, which leads to thelarge fracture energy of the dissipative gels. A problem of thedissipative tough polymer gels is their low mechanical recoverability. When reversible bonds (e.g. hydrogen bonds, ionicbonds, etc.) are utilized as sacrificial bonds, the broken sacrificial bonds can be recovered, but it takes a relatively longtime (at least minutes) for complete recovery. For the applications as implant biomaterials such as artificial ligaments
and prosthetic joints, the mechanical instant recoverability
is needed because they should show constant mechanicalresponses under repeated deformations at a high frequency(e.g. 1 Hz).
Another tough polymer gel is slide-ring (SR) gel, in
which polymer chains are cross-linked by ring molecules(Fig.1) [2]. The sliding of the movable cross-links composedof rings homogenizes network structure and reduces stressconcentration in polymer networks, which results in highdeformability and softness of SR gels. We have been investigating toughening mechanism of SR gels composed ofpolyethylene glycol (PEG) and cyclodextrin (CD). For
conventional polymer gels cross-linked by fixed covalentbonds, the fracture energy is dominated by the strand length
between cross-links. In the case of SR gels, the sliding of
the cross-links enlarges the strand length and enhances thefracture toughness [3].
A unique feature of SR gels is their high mechanicalrecoverability. SR gels show no mechanical hysteresis under
repeated stretching. This suggests that the sliding movementof the cross-links is faster than breaking/reforming dynamics
of the reversible sacrificial cross-links. We systematicallyinvestigated the crack propagation behavior of SR gels at

References[1] N. Nagaosa and Y. Tokura, Nat. Nanotechnol. 8, 899 (2013).
[2] S. Muhlbauer et al., Science 323, 915 (2009).
[3] X. Z. Yu et al., Nature 465, 901 (2010).
[4] X. Z. Yu et al., Nat. Mater. 10, 106 (2011).
[5] T. Nakajima et al., Phys. Rev. Research 2, 043393 (2020).
[6] C. Pappas et al., Phys. Rev. Lett. 102, 197202 (2009).
[7] J. Kindervater et al., Phys. Rev. X 9, 041059 (2019).
Authors
T. Nakajima, T. Odaa, M. Hinoa, H. Endob, K. Ohishic, K. Kakuraic,d,A. Kikkawad, Y. Taguchid, Y. Tokurad,e, and T. Arimad,eaKyoto University.
bIMSS, High Energy Accelerator Research Organization.
cComprehensive Research Organization for Science and Society(CROSS).
dRIKEN Center for Emergent Matter Science (CEMS)
eThe University of Tokyo.
Fig. 1. Strain rate dependence of fracture energy of slide-ring and fixedcross-link gels.

ISSP Activity Report 202029

various strain rates to evaluate the sliding dynamics of the
movable cross-links [4]. At a certain strain rate and crack
propagation velocity, a drastic decrease of the fractureenergy was observed (Fig.1). For lower strain rates andcrack propagation velocities, the slide-ring cross-links haveenough time to slide along the polymer axes, which leads
to the enhanced fracture energy. At fast fracture, however,the sliding of cross-links cannot catch up with the network
deformation, and the fracture energy decreases to the samelevel as that of a fixed cross-link gel. From the critical crack
propagation velocity at the transition point, we estimatedthe time scale of the sliding dynamics to be micro-seconds.
This result is consistent with the diffusion coefficient of thesliding dynamics for CDs on PEG axis evaluated by a fullatomistic molecular dynamics simulation [5]. The fast sliding
motion of the cross-links is the origin of the high mechanicalrecoverability of SR gels under repeated deformations. SRgels exhibits high toughness and mechanical recoverability,
which are needed for implant biomaterials and elastomer
actuators for soft robots.
References[1] J. Y. Sun, X. Zhao, W. K. Illeperuma, O. Chaudhuri, K. H. Oh, D. J.
Mooney, J. J. Vlassak, and Z. Suo, Nature 489, 133 (2012).
[2] K. Ito, Polym. J. 39, 489 (2007).
[3] C. Liu, H. Kadono, K. Mayumi, K. Kato, H. Yokoyama, and K. Ito,
ACS Macro Lett. 6, 1409 (2017).
[4] C. Liu, H. Yokoyama, K. Mayumi, and K. Ito, Mech. Mater. 156,
103784 (2021).

[5] Y. Yasuda, Y. Hidaka, K. Mayumi, T. Yamada, K. Fujimoto, S.
Okazaki, H. Yokoyama, and K. Ito, J. Am. Chem. Soc. 141, 9655
(2019).
Authors
K. Mayumi. C. Liu. K. Itoa
aThe University of Tokyo

Charge-Fluctuation-MediatedSuperconductivity in Organic Complexes
Kindo, Kohama, and Tokunaga Groups
Electron pairing in unconventional superconductors
is driven by quantum fluctuations of electronic degrees
of freedom. For various unconventional superconductors, such as high-Tc cuprates and heavy-fermion systems,
their magnetic degrees of freedom often play an essential
role in the pairing mechanisms. Although charge degrees
of freedom can also mediate the Cooper-pair formation as
exotic pairings, experimental investigation of the chargefluctuation-mediated superconductivity has been insufficientfor detailed discussion because only a few materials showsuperconductivity with pure charge instability.
The βʹʹ-type organic charge-transfer complexes are
known as the candidates showing superconductivity
mediated by charge fluctuations. As shown in Fig. 1, theorganic molecules in the βʹʹ-type structure are uniformly
arranged. Since the valence of each molecule is +0.5, theenergy band of the electronic system is 1/4-filled. In thiscase, it is known that charge density exhibits inhomogeneous distribution in neighboring sites to reduce the intersite
Coulomb repulsion when electron correlations are strong.
Therefore, it is expected that this charge instability can
trigger a superconducting transition. In the present research,
we investigated the low-temperature electronic states ofsome βʹʹ-type materials, βʹʹ-(BEDT-TTF)4[(H3O)M(C2O4)3]
G (M=metal ions, G=guest molecules), using various

30

ISSP Activity Report 2020

Fig. 1. Molecular arrangement of organic molecules in the conducting
plane of the βʹʹ-type organic materials. The dashed lines show predominant transfer integrals between the molecules, forming the distorted
triangular lattice.

measurements and unveiled that the superconductivity in thiscompound is possibly mediated by charge fluctuations [1,2].
Figure 2 shows the high-magnetic-field quantum oscillations in magnetoresistance ΔR/R of βʹʹ-(BEDT-TTF)4[(H3O)
Ga(C2O4)3]PhNO2 at various temperatures. As shown by
the dashed envelopes, the amplitude of the oscillations ismodulated below 8 K. Detailed analyses with the LifshitsKosevich formula indicate that a transition occurs at 8 K,
leading to a split of the Fermi pocket and an enhancementof the effective mass. This transition is observed in ultrasonic properties whereas a low-temperature x-ray diffraction
measurement detects no significant anomaly at the temperature. Also, this transition has no magnetic field dependence.
As orbital degrees of freedom are quenched in the present
material, these results mean that a local lattice modulation
is induced by charge disproportionation. Just below thistransition temperature, this compound shows a transition
from the charge disproportionation to the superconducting
state at Tc~7 K. By replacement of the guest molecules, Tc is
reduced with a decline of the charge disproportionation. Thistendency implies that the charge fluctuations enhanced inthis compound govern the pairing of the superconductivity.
Besides, we performed heat capacity measurements todetermine the gap symmetry of the superconductivity. The
temperature, magnetic field, and field-angle dependence ofthe heat capacity indicates that the gap function is aniso-

Fig. 2. High-magnetic-field Shubnikov-de Haas oscillations ofβʹʹ-(BEDT-TTF)4[(H3O)Ga(C2O4)3]PhNO2 shown as ΔR/R. The dottedcurves on the data are fits to a two-component Lifshitz-Kosevich
formula. The dashed envelopes are guides for the eye to emphasize theamplitude change.

tropic and has no node on the Fermi surface, distinct fromthat of nodal d-wave symmetry arising from antiferromagnetic spin fluctuations observed in many unconventional
superconductors. This full-gapped nature suggests thatintersite repulsion, leading to the charge disproportionation,
works as an attractive force for the on-site Cooper pairing.
These results indicate that the present superconductivity
is formed by the charge fluctuations, and also, elucidate thedetailed features of the charge-fluctuation-mediated superconductivity.
References[1] S. Imajo, H. Akutsu, A. Akutsu-Sato, A. L. Morritt, L. Martin, and
Y. Nakazawa, Phys. Rev. Res. 1, 033184 (2019).

[2] S. Imajo, H. Akutsu, R. Kurihara, T. Yajima, Y. Kohama, M.
Tokunaga, K. Kindo, and Y. Nakazawa, Phys. Rev. Lett. 125,
177002 (2020).
Authors
S. Imajo, R. Kurihara, Y. Kohama, M. Tokunaga, and K. Kindo

Magnetic-Field-Induced Insulator-Metal
Transition in a Strongly Correlated
Insulator V1-xWxO2 at 500 T
Y. H. Matsuda and Takeyama Groups
The magnetic ground state of most of strongly correlated insulators is antiferromagnetic ordered state. Rolesof electron spins in realizing the insulating nature incorrelated systems is well understood in the single-band
Hubbard model; the magnetic energy determined by theexchange interaction J is much smaller than the Coulomb
energy U, and thus the electrical insulating nature is essentially insensitive to the magnetic state. In some of actual
materials, however, spin degree of freedom couples to crystal
lattice through the orbital degree of freedom and results in
nontrivial electronic states. Actually, in some of the strongly
correlated insulators, the ground state exhibits spin-singlet
state instead of the antiferromagnetic state. One of the moststudied correlated insulators with the singlet ground state isVO2 that undergoes a very sharp metal-insulator transition at
340 K. It has been debated for more than 60 years whether

Fig. 2. Schematic of the magnetic-field-induced insulator-metal (IM)transition. The left side shows that the potential barrier ∆ is lowered by
the Zeeman energy. The middle part schematically shows the collapseof the V–V dimers. The right part shows that applying a magnetic field
induces the dissociation of the dimer owing to the destabilization offormation of the bonding state Ψ of the molecular orbital, where φa andφb are the wave functions of the independent vanadium ions.

the electron correlation or the structural instability is moreessential driving force behind the transition.
In the present work, we have demonstrated that atungsten (W)-doped VO2 undergoes insulator-metal (IM)transition by applying a ultrahigh magnetic field of 500 T.
The field is produced by the electromagnetic flux compression 1000-T generator at the ISSP [1]. Figure 1 shows
the magneto-transmission of a V0.94W0.06O2 thin film at
1.977 μm [2]. A reduction of the transmission with magnetic
field when the field is greater than 100 T is a direct evidenceof the field induced metallization. One of the most probableexplanation for the field-induced IM transition is thatthe singlet-dimer state is suppressed by such a ultrahighmagnetic field, and which results in breaking of structural
V-V dimers as well. The molecular orbital occupied by twoelectrons with different spin directions is collapsed by forcedalignment of the two spins by the strong magnetic field of
500 T. The discovered spin-controlled IM transition suggeststhat the principal driving force to the insulating state at a lowtemperature is structural instability (formation of dimers)
rather than the electron correlation.
From another view point, the observed collapse of theV-V dimer is a similar phenomenon with the so-called thechemical catastrophe where a chemical bond is destroyed by
the Zeeman effect of a super-strong magnetic field greaterthan 106 T in the cosmic space [3]. An energy to collapse
the molecular orbital of the V-V dimer is scaled down by
3-4 orders of magnitude in a solid compared to a normal
molecule, which enable us to observe the chemical catastrophe in a solid. Figure 2 is a schematic of the field-induced
IM transition of W-doped VO2; the V-V dimers are dissociated by forced alignment of spins in a 500-T-field [2].
References[1] D. Nakamura, Akihiko Ikeda, H. Sawabe, Y. H. Matsuda, and
S. Takeyama, Rev. Sci. Instrum. 89, 095106 (2018).
[2] Y. H. Matsuda, D. Nakamura, A. Ikeda, S. Takeyama, Y. Suga,
H. Nakahara, and Y. Muraoka, Nat. Commun. 11 3591 (2020).
[3] M. Date, Australian Journal of Physics 48, 187 (1995).
Authors
Y. H. Matsuda, D. Nakamura, A. Ikeda, S. Takeyama, Y. Sugaa,
H. Nakaharaa, and Y. Muraokaa
aOkayama University

Fig. 1. Magnetic-field dependence of the optical transmission at 14
and 131 K. The transmission is plotted before the breaking point of thedestructive measurement. The shaded area indicates transmission lower
than that in the high-temperature metallic phase at 291 K. Inset: transmission change ∆Trans. as a function of the magnetic field. The dashedyellow line corresponds to ∆Trans.= 0. The red and purple arrow
indicate the field positions (B*) where ∆Trans. deviates from zero.

ISSP Activity Report 202031

Capacitive Detection of PhysicalQuantities in Pulsed Magnetic Fields
Tokunaga Group
Capacitance is known as a physical quantity that can bemeasured with high precision. We have developed a system
to precisely measure various physical quantities that change
in pulsed high magnetic fields using high-speed capacitancemeasurements [1].
First, we measured magnetostriction. We attach a pairof electrode plates on top of a sample and on the probewith keeping a small gap between them. We can detect
small change in the sample length through the change in thecapacitance of this setup. Using this method, we observed
magnetostriction in a Heusler alloy caused by a significant
magneto-volume effect [2]. The entropy change associatedwith this magneto-volume effect is regarded as the originof the giant inverse magneto-caloric effect observed in thisclass of materials [2,3]. Therefore, quantitative evaluationof the structural change can be essential to understand themagnetocaloric effect. In non-magnetic metals, magnetostriction can be used to detect the field-induced changes inband filling. Utilizing this technique, we achieved thermodynamic evidence of complete valley polarization in elemental
bismuth in the ultra-quantum limit state [4].
Capacitance measurements are also valuable for studying
multiferroic materials in which magnetic order correlateswith the dielectric property. If the change in magnetic
symmetry makes the crystal polar, we can detect it throughelectric polarization measurements. On the other hand, thechange is hardly discernible in the polarization if the spinorder does not break global inversion symmetry, such as in
the antiferroelectric state. Our capacitive measurement ofdielectric constants enabled to detect this kind of change
in symmetry at high magnetic fields. Figures 1 show themagnetization and dielectric constant of single crystals of

Fig. 1. Field dependence of (a) magnetization and (b) real part of therelative dielectric constant of Pb(TiO)Cu4(PO4)4. Successive transitions of cluster spin multipole order show up as multiple anomalies inboth physical quantities. Broad hump structure in magnetization around
26 T becomes prominent in the dielectric constant measured using thecapacitance method.

32

ISSP Activity Report 2020 
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Fig. 2. (a) Temperature variation of the capacitance of KTa1-xNbxO3 atzero magnetic field. (b) Magnetic field dependence of the capacitanceof KTa1-xNbxO3 at various temperatures. These two results indicate that
this material can be used as a capacitance thermometer insensitive toa magnetic field. (c) Magnetocaloric effects in Gd3Ga5O12 measured
using this capacitance thermometer. The inset shows schematics ofthe experimental setup. Our fast capacitance measurements enable toevaluate the magnetocaloric effect in this material in a pulsed magnetic
field.

Pb(TiO)Cu4(PO4)4. In contrast to the broad hump structurein the magnetization curve, dielectric constant shows a steep
change around 26 T with field hysteresis, which unambiguously indicates the change in magnetic symmetry at thisfield. This technique provides us with a novel tool to identify
the symmetry of magnetic phases emerging in high magnetic
fields.
By measuring dielectric constants of some non-magnetic
materials attached to a sample, we can evaluate the temperature change of a sample in magnetic fields: the so-called
magneto-caloric effect. We show an example of the measurements of the magneto-caloric effect using KTa1-xNbxO3(x = 0.02) as a capacitance thermometer, whose dielectric
constant has a temperature dependence as shown in Fig. 2(a).
We have previously developed a similar system to measure
the magneto-caloric effect using a thin-film resistancethermometer [5]. Although this method works effectively,
we have to calibrate the effect of magnetoresistance in thethermometer in advance at each temperature. On the other
hand, in the present capacitance thermometer, the capacitance is almost insensitive to the applied magnetic field, as
shown in Fig. 2(b). Using this thermometer, we can successfully measure the magneto-caloric effect of a magnetic
refrigerant Gd3Ga5O12 in a pulsed magnetic field (Fig. 2(c)).
Due to the non-magnetic nature of this thermometer, we
can also measure magnetocaloric effects simultaneouslywith magnetization. Such simultaneous measurements will
enable us to precisely determine the field-temperature phase
diagram of all the kind of magnetic materials and to discuss
more precise thermodynamics.
High precision measurements of capacitance improve
evaluation of the structure, symmetry, and entropy changesof the sample in pulsed magnetic fields. We expect that sucha technological innovation will open up new horizons inscience at high magnetic fields.

References[1] A. Miyake et al., Rev. Sci. Instrum. 91, 105103 (2020).
[2] T. Kihara et al., Phys. Rev. Mater. 5, 034416 (2021).
[3] T. Kihara et al., Phys. Rev. B 90, 214409 (2014).
[4] A. Iwasa et al., Sci. Rep. 9, 1672 (2019).
[5] T. Kihara et al., Rev. Sci. Instrum. 84, 074901 (2013).
Authors
A. Miyake, H. Mitamura, S. Kawachi, K. Kimuraa, T. Kimuraa,
T. Kiharab, M. Tachibanac, and M. Tokunaga
aThe University of Tokyo
bIMR, Tohoku University
cNational Institute for Material Science

Generation of Long Pulsed-Magnetic
Fields by Using Electric-DoubleLayer-Capacitors
Kohama GroupThe generation of pulsed magnetic fields was firstachieved by Pyotr L. Kapitsa approximately a century ago.
After his pioneering work, various power supplies were
tested for pulsed field generation. The most common power
supply for generating a pulsed magnetic field is the highvoltage and high-speed capacitor bank. However, such acapacitor bank has small value of capacitance (C = 1 – 100mF) and consequently restricts the available range of pulsed
duration up to ~0.1 s. The short pulse duration makes it difficult to put pulsed magnets to widespread use. Developing analternative power supply for generating pulsed high magnetic
fields is a demanding task in high magnetic field science.
In this study, we have reported a power supply basedon an electric-double-layer-capacitor (EDLC) which iscomposed of a series connection of 336 EDLC cells [1].
This system has a total capacitance of 10.7 F and can store
the energy of 3.87 MJ with the charged voltage of 860 V.
We find that the EDLC based power supply can generatehigh magnetic field up to 30 T with pulse duration of ~1 s.
Because of the low-cost and compact design of developed
EDLC based power supply, our system can be used in many
research and industrial fields.

Figure 1a and b show the pulsed field profiles generated
by our EDLC system. The arrows in Fig. 1 indicates thetiming of the closing an energy bifurcation thyristor, whichleads to an intentional reduction of the pulsed current. Dueto the large capacitance of EDLC bank, we could observe theoverdamped-like waveform for the setup A (Fig. 1a), which
has long pulse duration of ~ a few seconds. The peak valuesof the fields (currents) are 16.2 T and 23.9 T (5.91 kA and4.39 kA) for setup A and setup B (Fig.1b). The peaks of the
fields shift to later times with decreasing charged voltage
and indicate the strong influence of Joule heating on thepulsed field profile. Indeed, the calculated temperature of thepulsed magnet as shown in the right axes in Fig. 1(b) clearlyshows the large Joule heating effect. In the paper, we havealso reported how the pulsed field profile is influenced by
the capacitance, internal resistance, coil resistance, charged
voltage, coil inductance (not shown in this material) andfound that a suitable choice of the coil design could increase
accessible field strength up to 30 T and enhance pulsed
duration up to a few seconds.
In summary, we have developed the EDLC based power
supply which is cost-effective and compact discharge systemand can generate strong magnetic fields with long duration.
These systems can be used for many research fields such as
nuclear magnetic resonance and neutron scattering experiments, which typically require long accumulation times
to achieve good signal/noise ratios. In addition, we haveconfirmed that the generated pulsed field profile is welldescribed by a series-connected RLC model with taking
Joule heating into account. Finally, we note that connecting
several EDLC units in parallel and series can generate
a strong pulsed field of more than 30 T with a long time
duration of a few seconds.
Reference[1] K. Matsui, T. Kanda, Y. Ihara, K. Kindo, and Y. Kohama, Rev.
Sci. Instrum. 92, 024711 (2021).
Authors
K. Matsui, T. Kanda, Y. Iharaa, K. Kindo, and Y. Kohama
aHokkaido University

Observation of the Quantum Shift ofa Backward Rescattering Caustic by
Carrier-Envelope Phase Mapping
Itatani Group

Fig. 1. Pulsed Field Profile generated by the EDLC based power
supply. (a) Magnetic field profile generated with low-impedance pulsed
magnet. (b) Magnetic field profile generated with high-impedance
pulsed magnet. The right axis represents the calculated magnet temperature.

When an atom or molecule is exposed to linearly-polarized intense optical fields, an electron wavepacket is freed
from the atom, accelerated by the field, then collides withthe parent ion. This process, recollision, is the fundamentalof attosecond science. When recollision becomes recombination, the ionizing atoms emits a high energy photon(high harmonic generation). Meanwhile, it is well known
that a part of recolliding events becomes elastic scattering.
Especially the backward rescattering leads to the generation of high-energy electrons with a drift kinetic energy up
to 10Up, where Up is the ponderomotive potential. Recent
theoretical progress of the adiabatic theory of rescattering
gives an analytical formula for photoelectron momentum
distributions (PEMDs) near the 10Up cutoff which is scaledby the cutoff energy. Although the theoretical treatment of
rescattering is fully quantum mechanical and straightfor-

ISSP Activity Report 202033

ward, the experimental verification has been very difficult
because it is not easy to realize systematic experiments to
extract well-defined single rescattering events with multicycle laser pulses.
We hereby used intense few-cycle pulses in infrared
to measure the backward PEMDs with controlled carrierenvelope phases (CEPs). The extremely short duration of
the optical pulse allows to extract the single rescattering
events of the three highest energies, and the CEP control
enables to systematically change the maximum intensity inthe focused volume without affecting the other parameterssuch as spatial distribution of the field intensity. Figure 1
shows the CEP dependent PEMDs with a pulse energy of
210 μJ. Dashed and solid curves represent classical andquantum caustics. The CEP dependent PEMD assures the
one-to-one correspondence of the electron momentum at the
instance of rescattering and the CEP, which we call the CEP
mapping method. From this CEP mapping, we successfully
determined the field intensity and the pulse duration to be
2.6 × 1013 W/cm2 and 13.8 fs, respectively. Using theseparameters, the observed PEMDs are deconvolved to three
PEMDs that correspond to the rescattering events of different
intensities within a single optical pulse, as shown in Fig. 2.
The laser parameters, elastic scattering differential crosssections, and tunnel ionization rate of the taget are encodedin PDMDs. Such information can be extracted from theFig. 3. Extracted DCSs of Xe+ for estimated field amplitudes of
0.02722 (circle) and 0.03028 a. u. (closed triangle) as a function of therescattering momentum. The black curve represents calculated DCSs.

observed PEMDs based on the adiabatic theory. Based on
the quantitative agreement of the observed cutoff behaviorof PEMDs with the adiabatic theory, elastic scattering crosssection as a function of scattering momenta is successfully
determined as shown in Fig. 3.
In summary, we experimentally and theoretically
explored the rescattering PEMDs of a Xe atoms near thecutoff using CEP-stable few-cycle pulses [1]. The observed
PEMDs are well reproduced by the analytical formula ofthe adiabatic theory including the quantum shift of thecaustics. The results not only demonstrate the fact that the
CEP mapping method with the adiabatic rescattering theory
allows to extract well-defined elastic scattering, but also
opens an opportunity to use rescattering to observe novel
electron states such as vortex electrons [2].
References[1] T. Mizuno, N. Ishii, T. Kanai, P. Rosenberger, D. Zietlow, M. F.
Kling, O. Tolstikhin, T. Morishita, and J. Itatani, Phs. Rev. A 103,
043121 (2021).
[2] O. I. Tolstikhin and T. Morishita, Phys. Rev. A 99, 063415 (2019).

Fig. 1. Measured PEMDs as a function of CEP at a pulse energy of 190
μJ. Dashed and solid curves represent classical and quantum causitcs at
the intensity of 2.6 × 1013 W/cm2 and pulse duration of 13.8 fs.

Authors
T. Mizno, N. Ishii, T. Kanai, P. Rosenbergera, D. Zietlowa, M. F.
Klinga, b, O. Tolstikhinc, T. Morishitad, and J. Itatani
aLudwig-Maximillians-Universität München
bMax Planck Institute for Quantum Optics
cMoscow Institute of Physics and Technology
dThe University of Electro-Communications

Observation of Small Fermi Pockets in a
Copper Oxide High-Tc Superconductor
Kondo and Kohama Groups

Fig. 2. Measured PEMDs at CEP=0 and 0.4π at an estimated intensityof 2.6 × 1013 W/cm2 and a pulse duration of 13.8 fs. The thick red, thinblue, and thin green curves show calculated PEMDs corresponding toa half cycle of the electric field as depicted in the top figures. Thin andthick arrows indicate the classical and quantum caustics, respectively.

34

ISSP Activity Report 2020

High-temperature superconductivity is one of the mostsignificant discoveries in physics in the latter half of the20th century. Since the discovery of high-temperature superconductivity in 1986, their physical properties have been
intensively studied from various aspects. However, a unified
understanding of the mechanism for high-temperature superconductivity has not yet been established. The most basic
and important issue relevant to it is the relationship between
antiferromagnetic state forming Mott insulator and hightemperature superconductivity induced by carrier doping.

around the Fermi pockets, providing spectroscopic evidence
for the coexistence between antiferromagnetism and superconductivity in the same CuO2 sheet.
Our results are expected to facilitate the experimental andtheoretical research pursuing the mechanism of high-temperature superconductivity in cuprates. In particular, these willcontribute to solving the long-standing puzzle of the Fermi
arc phenomena and urge the need for revisiting the Mott
physics leading to the electron pairing in cuprates, which, up
to now, has been based mainly on the research on single- anddouble-layered compounds with inhomogeneous electronic
states.
References[1] S. Kunisada et al., Science 369, 833 (2020).

Fig. 1. (a) Crystal structure of single-layer cuprate superconductor(Bi2Sr2CuO6+δ is presented as an example). (b) Crystal structure of
5-layer cuprate superconductor, Ba2Ca4Cu5O10(F,O)2, we have focusedon in this study. (c) Fermi surfaces of Ba2Ca4Cu5O10(F,O)2 observedby laser-ARPES. (d) Quantum oscillation measurements for the same
compound.

In this study, we focused on a multi-layered cuprate high-Tc
superconductor (Fig. 1b) with a clean superconducting
plane (CuO2 layer) that is structurally flat and has charges
uniformly distributed along the plane. Here we perform
laser-based angle-resolved photoelectron spectroscopy(ARPES) with high energy resolution and quantum oscillation measurement at a strong magnetic field and present thefirst observation of small Fermi pockets formed in the close
vicinity of the Mott insulating phase. Furthermore, we findthe coexistence of antiferromagnetism and high-temperature
superconductivity in the same CuO2 sheet.
Superconductivity of cuprate superconductors occurs
via carrier doping to the CuO2 layers from the dopant layers
sandwiching them. The main target in previous studies wasfor structurally simple compounds with one or two CuO2
planes per unit cell (Fig. 1a). While these have the advantage to be easy in synthesizing, it has been pointed outthat the direct contact of the dopant layers to the superconducting layers causes structural distortion and non-uniform
charge distribution along the CuO2 plane, leading to disordered electronic states. To solve this problem, we selecteda multilayer system with five CuO2 planes per unit cell,
Ba2Ca4Cu5O10(F,O)2, for a study (Fig. 1b).
This compound has inner CuO2 planes that can avoid
direct contact to the dopant layers. These inner CuO2 planes
are structurally flat, and at the same time, protected by theouter CuO2 plane from the dopant layers causing the effectsof spatially non-uniform carrier doping and defects. Therefore, this multilayered system gives us an excellent opportunity to study an extremely clean superconducting layer that isclose to the ideal case treated in theoretical studies.
By performing high-resolution laser-ARPES andquantum oscillation measurements for the clean superconducting layers (Fig. 1c), we successfully observed small
Fermi pockets, which had been theoretically expected yet
elusive for more than 30 years of research for cuprates. The
spectra of Fermi pockets are much sharper in energy thanthat of Fermi arc, indicating that the pockets we observed
indeed come from the inner CuO2 plane protected from therandom potential induced by dopant layers. Moreover, wehave confirmed the existence of d-wave superconducting gap

Authors
S. Kunisada, S. Isonoa, Y. Kohama, S. Sakaib, C. Bareille, S. Sakuragi,
R. Noguchi, K. Kurokawa, K. Kuroda, Y. Ishida, S. Adachi c, R.
Sekinea, T.K. Kimd, C. Cachod, S. Shin, T. Tohyamaa, K. Tokiwaa andT. Kondo
aTokyo University of SciencebRIKEN Center for Emergent Matter Science (CEMS)
cMANA, National Institute of Material SciencedDiamond Light Source

Higher-Order Topological Insulator
Built from van der Waals Stackingof Bismuth-Halide Chains
Kondo GroupA Z2 weak topological insulator (WTI) state can beformed in a material with stacked quantum spin Hall insulators (QSHIs), where the topological surface states appear
only on side surfaces by accumulating helical edge states of
QSHIs [1]. Similarly, a higher-order topological insulator(HOTI) is expected to be built from stacking QSHIs so that
1D helical hinge states are formed by accumulating the edge
states. Utilizing symmetry-based indicators, the HOTI phases
have been predicted in materials which were previously
regarded as trivial insulators [2]. So far, only bulk bismuth
has been experimentally shown to be in the HOTI phase[3]. However, bismuth is a semimetal, whose bulk cannot
become insulating by carrier doping. Therefore, the experimental realization of a HOTI in an insulating material has
been awaited.
In this study, we propose that quasi-1D bismuth halides
offer a novel platform to investigate various topologicalphases that depend on the stacking sequences of Bi4X4(where X is I or Br) chains. A WTI state has been observedin β-Bi4I4 with single-layered chains per unit cell, while anormal insulator state has been obtained in α-Bi4I4, whichtakes a double-layered structure (Fig. 1) [1]. Although Bi4Br4
also consists of double layers, each layer is alternately
rotated by 180 degrees, leading to the prediction of a HOTI
phase due to the slight shift of the inversion center in the unit
cell. Based on this, we present angle-resolved photoemission spectroscopy (ARPES) results showing that Bi4Br4 is a
HOTI for the first time as a real 3D material [4].
An advantage of employing quasi-1D materials lies in
the formation of a number of steps aligned parallel to thechain direction on the cleavage surface. Figure 2(a) shows aphotographic image of ribbon-like Bi4Br4 crystals used in theexperiments. While the cleaved surface is relatively rough,as shown in Fig. 2(b), Grazing incidence Small-angle X-ray

ISSP Activity Report 202035

energy of the roughly estimated Dirac point (middle panel ofFig. 2(c)). The in-gap states are found to form a quasi-1D
intensity distribution in the Fermi surface mapping. Theseobservations are in stark contrast to the case for a trivial
insulator α-Bi4I4, where no indication for in-gap states isfound in ARPES image or the corresponding momentum
distribution curve (Fig. 2(d)). Therefore, the 1D Dirac state
in Bi4Br4 is attributed to the topological states, demonstrating the realization of the HOTI phase in Bi4Br4. Our
comprehensive study on bismuth halides also shows that thedifference in chain stacking is the origin of the different band
topologies among Bi4Br4, α-Bi4I4, and β-Bi4I4. The quasi-1D
HOTI state we have verified in this study will bring the newcapability of designing and engineering functional materials
utilizing the stacking-dependence of the topological phases.

Fig. 1. Schematic of the various topological properties realized bystacking quasi-1D bismuth halide chains.

Scattering (GISAXS) measurements has revealed that thesurface consists only of the top (001) surface and the side(100) surface. This result indicates that a huge number ofhinges between the two planes are exposed on the cleaved
surface, offering the possibility of detecting the topologicalhinge states by ARPES measurements.
Figure 2(c) presents the ARPES result of Bi4Br4 taken
by high-resolution laser-ARPES. The strong photoemission signals observed at ~0.6 eV below the Fermi level (EF)are assigned to the bulk valence band. Interestingly, we
also observed metallic in-gap states with Dirac-like dispersions around EF (bottom panel of Fig. 2(c)). This is further
confirmed in the momentum distribution curves at theReferences[1] R. Noguchi et al., Nature 566, 518 (2019).
[2] F. Tang, H. C. Po, A. Vishwanath, and X. Wan, Nat. Phys. 15, 470(2019).
[3] F. Schindler et al., Nat. Phys. 14, 918 (2018).
[4] R. Noguchi et al., Nat. Mater. (2021). https://doi.org/10.1038/
s41563-020-00871-7
Authors
R. Noguchi, M. Kobayashia, Z. Jiangb, K. Kuroda, T. Takahashia, Z.
Xub, D. Leeb, M. Hirayamac, M. Ochid, T. Shirasawad, P. Zhang, C.
Lin, C. Bareille, S. Sakuragi, H. Tanaka, S. Kunisada, K. Kurokawa,
K. Yaji, A. Harasawa, V. Kandybaf, A. Giampietrif, A. Barinovf, T. K.
Kimg, C. Cachog, M. Hashimotoh, D. Luh, S. Shin, R. Aritac,i, K. Laib,
T. Sasagawaa, and T. Kondo
aTokyo Institute of Technology
bUniversity of Texas at Austin
cRIKEN Center for Emergent Matter Science (CEMS)
dOsaka University
eNational Metrology Institute of Japan, National Institute of Advanced
Industrial Scienceand Technology
fElettra Synchrotron Trieste
gDiamond Light Source
hStanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory
iThe University of Tokyo

Observation and Control of the Weak
Topological Insulator State in ZrTe5
Kondo Group

Fig. 2 (a) Photograph of Bi4Br4 crystals. (b) Laser microscope imageof a cleaved surface. (c) ARPES band map of Bi4Br4 around the Γpoint (bottom) and the corresponding momentum distribution curve at
E-EF=-60 meV (middle). Schematic of the cleaved surface of Bi4Br4
with topological hinge states (top). (d) Similar results to (c), but for
α-Bi4I4.

36

ISSP Activity Report 2020

A quantum spin Hall insulator hosts topological statesat the one-dimensional (1D) edge, along which backscattering by nonmagnetic impurities is strictly prohibited. Its
3D analogue, a weak topological insulator (WTI), possesses
similar quasi-1D topological states confined at side surfaces.
The enhanced confinement could provide a route for dissipationless current and better advantages for applications
relative to strong topological insulators (STIs) [1]. However,
the topological side surface is usually not cleavable and isthus hard to observe.
ZrTe5 was predicted to be a WTI candidate at the earlystage of exploring WTIs [2]. This compound exhibits very
high mobility, thus it has been regarded as a promising
platform for devices. Nonetheless, the topological propertyof ZrTe5 has not been experimentally identified to datebecause the observation of band structure on the side surface
has not been successful so far. All the previous surfacesensitive studies were carried out on the top surface, which
only confirms the lack of surface states; whether or not thismaterial is topological, therefore, has not been determinedbeyond speculation. Another difficulty for this study is that

ZrTe5 is in proximity to multiple topological phases, whereas
this feature could bring an attractive functionality of controlling bulk topology by fine-tuning a physical parameter.
In this study, we visualize the topological states of ZrTe5
by spin- and angle- resolved photoemission spectroscopy(ARPES): a quasi-1D band with spin-momentum locking
was revealed on the side surface. We further demonstrate thatthe bulk band gap is controlled by external strain, realizing
a more stable WTI state or an ideal Dirac semimetal (DS)state. The highly directional spin-current and the tunableband gap in ZrTe5 will provide an excellent platform forapplications [3].
ZrTe5 has a quasi-1D crystal structure. In principle, it
should be possible to cleave both top and side surfaces.
Along the lattice b direction, the layers are stacked by van
der Waals forces, and a clean surface can be easily obtainedby cleavage. Instead, Te–Te bonding exists between adjacentlayers along the lattice c direction, causing much moredifficulty in cleaving the side a-b surface. In this work, we
successfully cleaved the side a-b surface with a top post andsilver epoxy. The problem, however, is that the cleaved areas
are very small and inhomogeneous. With a synchrotronbased nano-ARPES (spot size < 1 μm), we took real spacemaps of photoemission intensity on several samples, as
sketched in Fig. 1(a). It is found that the typical dimension ofcleaved areas is around or smaller than 50 μm (Fig. 1(b)).
In k-space, a quasi-1D Fermi surface is exhibited byplotting ARPES intensities about the Fermi level, whichshows no dispersion along lattice b direction (Fig. 1(d)).
Along the lattice a direction, the band shows a hole-like
dispersion (Fig. 1(c)). With different photon energies (74eV and 7 eV), we did not find any change for this band,
which support its surface origin (no kz dispersion). For the
topological surface state, spin polarization is expected. To
confirm this, we have used spin-resolved ARPES to check

Fig. 1. ARPES measurements with nano-ARPES on the side surface.
(a) Schematic of the experimental setup. (b) Real space intensity
mapping with nano- ARPES. The signal is clear only within an area of
50 μm. (c) Band structure along the chain direction. The hole-like bandis one of the topological surface band. (d) Fermi surface of the surface
band in (c). Its spin-texture is indicated by red and blue arrows.

Fig. 2. ARPES measurements with laser-ARPES on the top surface
with strain. (a) Schematic of the experimental setup. (b) Topological phase diagram of ZrTe5 with different strain along chain
direction. (c) Band structure observed from the top surface withdifferent strain.

the spin texture of the surface band. A clear spin polarization
is detected along the lattice b direction. In contrast, the spinpolarization is almost zero along the lattice a and c directions, as indicated by red and blue arrows in Fig. 1(d). Therefore, the band is spin-polarized along the b-direction with
spin-momentum locking, consistent with the spin-texture of
WTIs with a quasi-1D dispersion.
On the top surface (Fig. 2(a)), we observe a small bulk
gap (~ 28 meV), as shown in the middle panel of Fig. 2(c),which indicates that the WTI state in ZrTe5 is protected only
marginally from external perturbations. Theoretical calculations proposed that the band gap changes with externalstrain. Thus, we further designed a strain device and checked
the strain dependence of band structure in ZrTe5. Both
compressive strain and tensile strain are applied along thechain direction of ZrTe5. The band structures under different
strains are displayed in Fig. 2(c). The sample with no strainshows a band gap of ~28 meV. With tensile strain, the band
gap is enlarged to ~ 51 meV. In contrast, we could reducethe band gap by compressive strain, even realizing a Diracsemimetal state with no band gap. In Fig. 2(b), we summarized the topological phases of ZrTe5 with different strains.
Our results demonstrate the existence and tunabilityof the WTI states in ZrTe5. The spin-momentum locked
quasi-1D surface states and the strain-tunable bulk gap make
ZrTe5 an ideal platform for 2D devices and spin engineering.
Reference[1] R. Noguchi et al., Nature, 566, 518 (2019).
[2] H. Weng, X. Dai, and Z. Fang, Phys. Rev. X 4, 011002 (2014).
[3] P. Zhang et al., Nature Commun. 12, 406 (2021).

ISSP Activity Report 202037

Authors
P. Zhang, R. Noguchi, K. Kuroda, C. Lin, K. Kawaguchi, K. Yajia,
A. Harasawa, M. Lippmaa, S. Nieb, H. Wengc, V. Kandybad, A.
Giampietrid, A. Barinovd, Q. Lie, G.D. Gue, S. Shinf, and T. Kondo
aNational Institute for Materials SciencebStanford University
cChinese Academy of Sciences
dElettra - Sincrotrone Trieste
eBrookhaven National Laboratory
fThe University of Tokyo

Bose-Einstein Condensation
Superconductivity Induced by
Disappearance of the Nematic State
Okazaki GroupThe crossover from the superconductivity of the BardeenCooper-Schrieffer (BCS) regime to the Bose-Einsteincondensation (BEC) regime holds a key to understanding
the nature of pairing and condensation of fermions. Figure
1a shows a canonical phase diagram of BCS-BEC crossover.
Weak-coupling Bardeen-Cooper-Schrieffer (BCS) pairingand strong-coupling Bose-Einstein condensation (BEC)
are connected continuously through the BCS-BEC crossover regime. This regime holds a key to understanding thenature of pairing and condensation of particles. In the weakcoupling BCS regime, the dispersion of the Bogoliubov
quasiparticle (BQP) shows the characteristic back-bending
near kF, which is downward convex around k = 0 in the caseof a hole band below EF, as shown in Fig. 1b, where k is the
crystal momentum of electrons. On the other hand, in thestrong-coupling BEC regime, the dispersion with a minimum

Fig. 1. Phase diagram of the BCS-BEC crossover and BQP band dispersions. (a) Canonical phase diagram of BCS-BEC crossover. Tc andT* are condensation and pairing temperatures, respectively. As thepairing strength increases, T* and Tc become separate, and a pseudogap
is expected at T* > T > Tc. (b)-(d) BQP band dispersions in the BCS
regime, the crossover regime, and the BEC regime, respectively. The
dispersion is downward convex around k = 0 for the BCS regime,
becomes flat in the crossover regime, and then becomes upward convex
in the BEC regime, because of the chemical potential shift. Δ/εF isreferred to as a measure of the pairing strength for single-band superconductors.

38

ISSP Activity Report 2020

Fig. 2. ARPES intensity plots of FeSe1−xSx along the Γ−M direction measured in the SC state. (a)-(e) ARPES intensity plots of x = 0,0.04, 0.13, 0.16, and 0.21 along the Γ-M direction taken at 2 K withs-polarized incident light. (f)-(j) Enlarged plots of (a)-(e) around EF.
The red markers represent the BQP band dispersions determined fromthe energy distribution curves.

gap at k = 0 is expected, which is upward convex aroundk = 0 in the case of a hole band below EF, as shown in
Fig. 1d. In the crossover regime, the BQP dispersion isintermediate between two extreme cases and the flat dispersion appears. In the crossover regime, a pseudogap is also
expected to open at a temperature higher than Tc as a resultof preformed bosonic pairs, as shown in Fig. 1a. Here, we
provide systematic evidence for the BCS-BEC crossover iniron-based superconductors FeSe1−xSx from laser-excitedangle-resolved photoemission spectroscopy, and show thatthe system enters the BEC regime with x = 0.21, where
the nematic state that breaks the orbital degeneracy is fully
suppressed.
Figures 2a-2e show the ARPES intensity plots of
FeSe1-xSex (where x = 0, 0.04, 0.13, 0.16, and 0.21) takenin the SC state with s-polarized light. To see the BQP band
dispersions more clearly, we show enlarged plots around EF
in Figs. 2f-2j. We have plotted the BQP band dispersions
determined from the energy distribution curves (EDCs) ofeach composition as indicated by red markers. From theseplots, we can see that the BQP band dispersion, which is
downward convex at x = 0, systematically changes andbecomes flat at x = 0.16; it then, eventually, becomes upward
convex at x = 0.21. This systematic change is consistent
with that expected from the chemical potential shift in the
BCS-BEC crossover, as shown in Figs. 1b-1d, and thus
strongly suggests that FeSe1−xSx is tuned from the BCS-BEC
crossover regime (x = 0) to the BEC regime (x = 0.21). To
obtain complete evidence for the BCS-BEC crossover, wehave investigated the existence of a pseudogap, and foundthat the pseudogap appears at T* ~15 K for x = 0.21. Thus,
from the BQP band and the existence of the pseudogap, we
have concluded that BEC superconductivity is realized for
x = 0.21. We have also investigated the substitution dependence of ∆/εF, where where ∆ and εF are the SC gap and the
Fermi energy, respectively, and from the obtained substitution dependence, we have also concluded that the multiband
nature is important for the realization of BEC superconductivity in this system, and that it is induced by the suppressionof electronic nematicity.
Reference[1] T. Hashimoto, Y. Ota, A. Tsuzuki, T. Nagashima, A. Fukushima,
S. Kasahara, Y. Matsuda, K. Matsuura, Y. Mizukami, T. Shibauchi,
S. Shin, and K. Okazaki, Sci. Adv. 6, eabb9052 (2020).
Authors
T. Hashimoto, Y. Ota, A. Tsuzuki, T. Nagashima, A. Fukushima,
S. Kasaharaa, Y. Matsudaa, K. Matsuurab, Y. Mizukamib, T. Shibauchib,S. Shinb, and K. Okazaki
aKyoto University
bThe University of Tokyo

ISSP Activity Report 202039

Joint Research Highlights
Quadrupole Orders in Pr-BasedCompounds with fcc Lattice Structure
H. Tsunetsugu, T. Ishitobi, and K. Hattori
Recently, physical properties of electric quadrupoles in
PrMgNi4 were studied experimentally and their antiferroordering has been discussed [1]. Praseodym ions constitute afrustrated structure of fcc lattice, and little had been known
for its ordered quadrupolar pattern. Studying this issue
theoretically, we have identified various ordered patterns anddetermined the phase diagram [2].
A non-Kramers doublet is the ground state of Pr3+ ion
in a crystal field with cubic symmetry, and two components of electric quadrupole are active therein: O20 and O22
with symmetry z2 and x2–y2, respectively. Despite the same
number of degrees of freedom, ordering of those quadrupoles may show different features from those in easyplane magnets due to two reasons. First, while magnetic
moments are axial vectors, electric quadrupoles are secondrank tensors, and therefore their effective interactions havea different form. We have determined its minimal form
with two parameters J and K corresponding to isotropic andanisotropic couplings. The second reason is the presence ofa third order Z3 anisotropy which time-reversal symmetry
prohibits for magnetic moments. This is induced by a hybridization of a singlet excited state, and its excitation energy Δ isanother control parameter of this system.
We have employed a mean field approach with a foursite unit and determined the phase diagram at zero andfinite temperatures. In the limit of Δ → ∞, the Z3 anisotropy
vanishes and three ordered phases appear at low temperatures depending on the ratio of J and K: O20 ferro, O20
antiferro, and O22 antiferro. For Δ < ∞, the Z3 anisotropy
takes effects and this leads to a phase diagram with richFig. 2. Structure of electric quadrupoles in the zyox phase. Quadrupoles
are not ordered on the corner sites.

structure. Related to induced canting of O22 components,
the most important result is the instability of the two-site
antiferro orders to more complex four-site structures. It isalso interesting that two of the new phases (zyox and zoxy)
exhibit a partial order in which one sublattice remains disordered and quadrupole is polarized as x2, y2, and z2 in eachof the other three sublattices. They are a triple-q order inwhich three components with different polarizations andwave vectors are coupled by the Z3 anisotropy, and we haveconfirmed their stability by a phenomenological Landau
theory. Thus, we have established the basic picture of thephase structure for quadruple orders, and hope that thisencourages further experimental studies as well as moreadvanced theoretical analysis on this issue.
References[1] Y. Kusanose et al., J. Phys. Soc. Jpn. 88, 083703 (2019);
Y. Kusanose et al., JPS Conf. Proc. 30, 011160 (2020).
[2] H. Tsunetsugu, T. Ishitobi, and K. Hattori, J. Phys. Soc. Jpn. 90,
043701 (2021).
Authors
H. Tsunetsugu, T. Ishitobia, and K. Hattoria
aTokyo Metropolitan University

Microscopic Theory of the Spin Hall
Magnetoresistance
M. Matsuo and T. Kato

Fig. 1. Phase diagram of the J-K-Δ model for electric quadrupoles on
the fcc lattice at temperature T = 0.1Δ. See Ref.2 for details of orderedphases.

40

ISSP Activity Report 2020

Magnetoresistance is one of the fundamental phenomenain the research field of spintronics. Recently, a novel type ofmagnetoresistance called spin Hall magnetoresistance (SMR)
has been observed in a bilayer system composed of a normal
metal (NM) and a ferromagnetic insulator (FI) [1]. SMR is
explained by the combination of charge-spin conversions
in NM and loss of spins at the NM/FI interface [1,2] (seeFig. 1 (a)). When an in-plane charge current is applied to thewhich is induced by creation or annihilation of magnons,
depends on the temperature, and has opposite magnetization
dependence, i.e., takes a maximum when the magnetization (or the Néel vector) is parallel to accumulated spins ina normal metal. The dynamic part becomes larger when theamplitude of the localized spin, S0, is smaller. This indicatesthat the sign of SMR changes at a specific temperature if
S0 is sufficiently small. In Fig. 1 (b), we show the measured
temperature dependence of SMR in Pt/NiO/YIG bilayer
systems [3]. The sign of SMR changes at 80, 140, and
180 K for NiO thickness of 2.0, 2.2, and 2.7 nm. In addition,
we show the fitted curve in the figure using quadratic
temperature dependence that is predicted by our theory. Thisfitting indicates that the quadratic temperature dependence
explains well the experimental data at low temperatures. We
also derived the Onsager relation between spin conductanceand thermal spin-current noise.
This study has been performed as a joint study withMamoru Matsuo, who was a visiting professor of ISSP in theacademic year 2016.

Fig. 1. (a) Schematic diagram of the normal-metal(NM)/ferromagneticinsulator(FI) bilayer system for the spin Hall magnetoresistance (SMR)
measurement. (b) Experimental data of SMR measured in Pt/NiO/YIG
bilayer systems. The data is normalized as −1 at zero temperature using
the extrapolated value by the fitting.

NM layer with a large spin-orbit interaction, spin accumulation is caused near the NM/FI interface by the spin Hall
effect. The amount of spin accumulation is affected by theorientation of FI magnetization because it changes the rate ofspin loss at the interface. A backward spin current owing tospin diffusion is converted into the charge current again by
the inverse spin Hall effect and induces longitudinal magnetoresistance, which depends on the orientation of FI magnetization. Recently, SMR has been reported for the bilayer
system composed of NM and an antiferromagnetic insulator(AFI) [3], where the orientation of the Néel vector of AFI has
been changed by the orientation of magnetization of FI using
the NM/AFI/FI trilayer structure.
SMR can be described theoretically by combining thespin diffusion theory with the boundary condition at theinterface in terms of the spin-mixing conductance [2].
However, in this theory, the spin-mixing conductance at theinterface is a phenomenological parameter that has to be
determined experimentally; therefore, its temperature dependence cannot be predicted. Furthermore, the magnetizationorientation dependence of the spin-mixing conductanceis assumed phenomenologically by its definition. This
semiclassical description of SMR seems to be insufficient forstudying quantum features of magnetic insulators such as theeffect of thermally excited magnons.
In our work, we constructed a microscopic theory of
SMR and derived a general formula of a spin conductance at
the interface for both NM/FI and NM/AFI bilayer systems
in terms of spin susceptibilities. We clarified that the spincurrent is composed of static and dynamic parts. The staticpart of spin current originates from spin flip owing to aneffective magnetic field induced by an interfacial exchange
coupling. This part is almost independent of the temperature,and takes a maximum when the magnetization (or the Néelvector) is perpendicular to accumulated spins in a normal
metal, which is consistent with intuitive discussions inprevious experimental studies. However, the dynamic part,

References[1] H. Nakayama et al., Phys. Rev. Lett. 110, 206601 (2013).
[2] Y. T. Chen et al., Phys. Rev. B 87, 144411 (2013).
[3] D. Hou et al., Phys. Rev. Lett. 118, 147202 (2017).
[4] T. Kato, Y. Ohnuma, and M. Matsuo, Phys. Rev. B 102, 094437(2020).
Authors
T. Kato, Y. Ohnumaa, and M. Matsuoa
aKavli Institute for Theoretical Sciences

Controlling Magnetic Anisotropyof Nano-Size Islands by Alloying
Y. Hasegawa and W. C. Lin
Atomically-thin Fe and Co layers and nano-size island
structures formed on the Cu(111) substrate usually exhibit
magnetization in the in-plane and out-of-plane directions,
respectively. The preferred magnetization directions is due tomagnetic anisotropy, and controlling the energy barrier due
to the anisotropy are fundamentally important for preserving
the magnetization direction and switching it from one ofthe preferred directions to the other for magnetic storage/
recording and spintronics devices.
The magnetic anisotropy basically originates from thespin-orbit interaction, and in the case of the 3d magnetic
elements, the magnetic anisotropic energy (MAE) is
described with its perturbation. MAE is, therefore, closely
related with the occupation/un-occupation of 3d valencebands near the Fermi energy. In the present study using
spin-polarized scanning tunneling microscopy (SP-STM)
we investigated how the anisotropy and MAE of the 3dmagnetic islands can be controlled by adjusting the valenceoccupation, that is, by alloying the two elements: Fe and Co,
which exhibit the contrasting anisotropic behaviors [1].
Figure 1 shows one of the Co50Fe50 islands pseudomorphically grown on the Cu(111) substrate. The thicknessof the triangular island is 2 monolayer, and the white barin the STM image corresponds to 10 nm. Spin-polarizedtunneling conductance spectra taken at the marked sitewith a Fe-coated W tip exhibits a strong peak at the sample
bias voltage of -0.3 V (-0.3 eV below the Fermi level). The
peak just below the Fermi level has been assigned to 3d

ISSP Activity Report 202041

Fig. 1. Spin-polarized tunneling spectra taken at the marked site of a
Co50Fe50 island structure presented in the inset STM image. Spectra
taken under magnetic fields of 0 T and ±1 T applied in the perpendicular direction to the island are presented. A Fe-coated W tip was used asa spin-polarized probe.

minority states of pure Co and the alloy islands. The peakheight varies depending on the magnetic field applied in
the perpendicular direction. Since the Fe layer coating theprobe tip is in-plane magnetized, the applied magnetic fieldtilts the probe magnetization toward the field direction. The
reduction in the -0.3 V peak height, that is, tunneling fromthe minority states, by a positive (upward) magnetic fieldindicates upward magnetization of the alloy island. The
magnetic field dependence of the tunneling conductance isalso found around -0.5 V. The states there are majority ones
as they react to the applied field in the manner opposite to
the minority ones.
The magnetic response of the tunneling conductancespectra indicates that the alloy island exhibits perpendicularmagnetic anisotropy (PMA). In order to make it clear we
swept the applied magnetic field and measured the tunnelingconductance at -0.3 V. The obtained result is shown in Fig. 2.
Gradual increase (decrease) with the increment (decrement)of the magnetic field is due to the tilt of the probe magnetization by the applied field. Then sudden drops observed
around ±0.12 T are due to the flip of the magnetization of thealloyed island from anti-parallel to parallel directions to theapplied field. From the positions the drops, we can measureswitching magnetic field or coercivity, which are closely
related with the energy barrier between the two PMA configurations.
The PMA energy depends on the size of the islands;
basically proportional to the area or the number of thecomposing atoms. We measured the switching field on

Fig. 3. Plot of switching magnetic field as a function of the number ofthe constituent atoms for both pure Co and CoFe islands. Coercivity(right vertical axis) was estimated from the switching fields taken withan antiferromagnetic tip, whose stray field is negligible.

various sizes of the alloy islands, and the results are summarized in Fig. 3 and compared with those taken on pure Co
islands. One can clearly find that the switching field of thealloy islands is significantly reduced from pure Co islands
by a factor of 3-4. For both Co and CoFe alloy islands,
the switching field gradually increases with the size of theislands or the number of the composing atoms, but around8000 atoms it exhibits saturation or even reduction with theisland size. The peculiar behavior of the switching field is
explained with a crossover of two magnetization reverse
processes; for small islands the magnetization flips at atime whereas large islands are reversed through a process of
domain wall nucleation and propagation. It should be noted
here that since a ferromagnetic tip is used stray field fromthe tip significantly reduces the switching field; throughthe comparison with the switching filed measured with an
antiferromagnetic Co-coated tip, which directly provides
coercivity, we estimated coercivity of our samples as
depicted in the right axis of Fig. 3. Nevertheless, the resultspresented in Fig. 3 clearly indicate that the switching field
is significantly reduced by the alloying, and suggest that thecrossover same as pure Co islands also occur on the alloy
islands.
Reference[1] H.-H. Yang, C.-C. Hsu, W.-C. Lin, and Y. Hasegawa, Phys, Rev.

B 104, 035422 (2021).

Authors
H.-H. Yang, C.-C. Hsua, W.-C. Lina, and Y. Hasegawa
aNational Taiwan Normal University

Free-Standing Oxide
Thin Film Membranes
Fig. 2. Tunneling conductance at the sample bias voltage of -0.3 V
taken at the center of the CoFe alloy island presented in the right STM
image during a sweep of the applied perpendicular magnetic field. The
sweeping directions are marked with red dashed arrows. Sudden dropsof the tunneling conductance indicate switching of magnetization of theisland.

42

ISSP Activity Report 2020

R. Takahashi and M. Lippmaa
A fundamental parameter that determines the physicalproperties of crystalline materials is the lattice parameter,
which is generally determined by the chemical composition

and the lattice type of a crystal. Options for tuning materials
properties or electronic phases by changing the lattice parameters is generally limited to the use of thermal expansion,
the application of mechanical pressure, or ionic substitutions— also known as chemical pressure. Thin films offer an
additional option of using epitaxial strain for lattice parameter control, since nanometer-scale films grown on singlecrystal substrates tend to assume the same in-plane lattice
parameter as the substrate material. Even in mechanicallyhard materials, such as oxides, epitaxial tensile or compressive strains of several percent can be routinely obtained.
Larger strain states, however, are difficult to obtain without
mechanical failure of a crystal. Likewise, it can be difficult
to fabricate entirely strain free thin films. An interesting
technique that can be used to apply very high local or longrange strain fields on thin layers is the use of free-standing
thin films. In our recent work, we have developed a newoxide thin film lift-off process based on the use of latticematched BaO sacrificial layers to grow thin films that canbe released from a substrate and transferred to a secondary
carrier [1]. The technique can be used to extend the achievable range of mechanical strain in oxide materials and is thebasis for constructing novel vibrational energy harvesting
devices.
The process of fabricating free-standing BaTiO3 films is
illustrated in Fig. 1. A sacrificial BaO layer is first grown on
a SrTiO3 substrate. The BaO layer is nearly lattice matchedwith titanate lattices and can be grown epitaxially on thesubstrate surface. The membrane material, in this case
BaTiO3, is grown on top of the sacrificial BaO layer. The
heterostructure is then removed from the thin film growthchamber and attached with an adhesive layer to a flexible
secondary carrier, such as a glass sheet or even a polymer
backing. When the whole structure is immersed in water, theBaO layer dissolves, detaching the single-crystal substratefrom the membrane layer, as illustrated in Fig. 1c, whichshows the detached membrane on a secondary flexible
carrier and the detached substrate. In principle, the substrate
can be recycled for growing another thin film.
One interesting application of the membrane process
is the development of piezoelectric energy converters for
harvesting vibrational energy. The use of a membrane device
is benefitial because the piezoelectric film, such as BaTiO3,
can be grown epitaxially under optimal growth conditions on a high-quality single crystal substrate, yielding thehighest piezoelectric coefficient. However, the bulk substrateprevents the application of large strains on the film, as isrequired for low-frequency vibrational energy harvesting.
Much higher strains can be achieved in a membrane device
where the piezoelectric film is detached from the substrateand sandwiched between flexible conducting electrodes,

Fig. 2. Construction of a vibrational energy harvesting device
consisting of a BaTiO3 membrane embedded between two ITO/PET
electrodes (a). The actual test device is shown in the inset of (b). The
voltage signal obtained by vibrating the test device at 5 Hz is shown in(b).

as illustrated in Fig. 2a. An energy harvester device can beconstructed by supported a flexible membrane cantileverfrom one end and attaching a test mass on the free end. Whenmechanical vibration is applied, a periodic current can begenerated in an external circuit, powering, for example, alow-power environmental sensor device. The output signal ofa test cantilever using a BaTiO3 film is shown in Fig.2b.
The demonstration of the process used a BaTiO3 film,
but the technique itself is applicable to any material that canbe grown epitaxially on the sacrificial BaO layer. For energy
harvesting devices, a flexible backing is generally required tomaintain the integrity of a millimeter-scale membrane.
An obvious use of the technique is to fabricate films thatare truly strain free and for this reason, the technique hasmuch broader potential applications than flexible piezoelectric energy conversion devices.
Reference[1] R. Takahashi and M. Lippmaa, ACS Appl. Mater. Interfaces 12,25042 (2020).
Authors
R. Takahashia, and M. Lippmaa
aNihon University

Lasing Dynamics in
Perovskite Microcavities
S. Chen and H. Akiyama

Fig. 1. Free-standing oxide thin film membrane fabrication process:(a) growth of a sacrificial BaO layer and the functional membrane
layer, (b) attaching the heterostructure with a poly-dimethylpolysiloxane (PDMS) adhesion layer to a indium tin oxide-coated polyethylene terephthalate (PET) carrier, and (c) removing the substrate bydissolving the BaO layer in water.

Perovskite materials have shown remarkable progressin both the field of solar cell and light emitting devices,
for solar cell, conversion efficiencies more than 25% havebeen achieved, and for light emitting devices, perovskitebased vertical cavity surface emitting lasers (VCSEL) anddistributed feedback (DFB) lasers have been fabricated, andvery fascinating single-mode lasing properties have been
demonstrated, however, the detailed lasing mechanism is still
unclear.

ISSP Activity Report 202043

We have fabricated various kinds of CePbBr3 perovskite
microcavities with a low-temperature liquid-phase growthmethod, such as microplate, microrods, and microcubes,
as shown in Figure 1, with a size from several tens to 200
micrometers. A clear substrate dependence of the morphologies of the perovskite microstructures in this growth method
has been observed [1]. With the excitation of a femtosecond
laser beam from a Ti: sapphire ultrafast laser system, all the
microcavities show lasing behavior under elevated excitation densities, the higher carrier density more that Mott
density at lasing threshold indicates the lasing behavior inthese perovskite microcavities should be mainly related toelectron-hole plasma rather exciton.
The lasing dynamics of the microcavities were further
studied with time-resolved photoluminescence system.
Figure 2 shows the spectrally and temporally resolved lasing
images recorded by a streak camera. With increasing excitation fluences, two importance features have been observed,
one is the redshift of the dominant lasing spectra to the low
energy side due to the band gap renormalization (BGR)
effect, another one is the blueshift of each lasing mode
to higher energy side due to the reduction of the refractive index caused by the high injection carrier density. At acertain excitation density, for example 180 μJ/cm2, we cansee a redshift of each mode to low energy side with timegoing on after excitation, which indicates a recovery of index
in microcavity, and the blueshift of the total lasing spectrawith time going on indicates a recovery of BGR, therefore
the lasing dynamics is merged with the transient BGR effectand the transient change of refractive index in perovskite
microcavities, detailed explanations can be found in the
published paper [2].
We also fabricated CsPbBr3 perovskite nanocrystals witha ligand-assisted recrystallization method, and sandwiched
the perovskite nanocrystals with two high-reflectivity distributed Bragg reflectors (DBRs) to form a VCSEL device[3]. The lasing performances of the perovskite nanocrystal

Fig. 2. (a) TEM image of CsPbBr3 perovskite nanocrystals with anaverage size around 12 nm, (b) Schematic of the CsPbBr3 nanocrystal
based VCSEL, where the CsPbBr3 nanocrystals are sandwiched with
two high-reflectivity DBRs. (c) Emission spectra of the VCSEL withdifferent excitation densities. The inset shows a waveform of the output
pulse with a pulse width of 23 ps from the VCSEL with an excitation
density 2 times of the threshold.

based VCSEL have been characterized with femtosecond
pulse excitations, and single-mode lasing of the VCSEL has
been observed. The threshold excitation density was around
8 μJ/cm2. The cavity quality factor Q of the VCSEL is
estimated to be around 1425. With the excitation powerover 2 times of the threshold, the output pulse width of theperovskite based VCSEL is measured to be around 23 ps,demonstrating a potential application in short pulse generation of perovskite based VCSELs. Investigations on the
carrier dynamics in the VCSEL is still in progress.
References[1]. G. Weng, J. Yan, S. Chen, C. Zhao, H. Zhang, J. Tian, Y. liu, X.
Hu, J. Tao, S. Chen, Z. Zhu, H. Akiyama, and J. Chu, Photonics Res. 9,54 (2021).
[2]. G. Weng, J. Tian, S. Chen, J. Yan, H. Zhang, Y. Liu, C. Zhao, X.
Hu, X.Luo, J.Tao, S. Chen, Z. Zhu, and J. Chu, H. Akiyama, ACS
Photonics 8, 787 (2021).
[3] C. Zhao, J. Tao, J. Tian, Y. Bai, G. Weng, H. Liu, Y. Liu, J. Yan, S.
Chen, Y. Pan, X. Hu, S. Q. Chen, H. Akiyama, L.Wang, and J. Chu,
Chemical Engineering Journal, 2020, in press, https://doi.org/10.1016/
j.cej.2020.127660
Authors
S. Chena and H. Akiyama
aEast China Normal University

Second Hydrogen-Ordered
Phase of Ice VI: Ice XIX
R. Yamane, K. Komatsu, and Y. Uwatoko

Fig. 1. SEM micrograph of CsPbBr3 single-crystal microcavities onsubstrates of (a) single-crystal Si, (b) sapphire, and (c) amorphousquartz. Streak-camera images (d) of the emissions from microplate withvarious excitation densities. In the vertical dimension, a time range of
40 ps for each slice is shown. The distinct lasing modes are labeled asMode A (with the highest photon energy) to Mode G (with the lowest
photon energy) above the threshold. In each slice, a redshift to low
energy with time for each mode is clearly demonstrated. Inset is alasing image of a microplate under the excitation of femtosecond lasing
beam, showing a whispering-gallery mode (WGM) lasing.

44

ISSP Activity Report 2020

Ice exhibits extraordinary structural variety in its
polymorphic structures. To date, more than 20 crystalline andamorphous phases of ice have been reported.
The existence of a new form of diversity in ice polymorphism has recently been debated in both experimental andtheoretical studies, questioning whether hydrogen-disordered
ice can transform into multiple hydrogen-ordered phases,
contrary to the known one-to-one correspondence between
disordered ice and its ordered phase. Recent experiments on
a high-pressure hydrogen-disordered phase, ice VI, revealed
an unknown hydrogen-ordered form besides the known
ordered phase, ice XV. However, due to experimental difficulties under the high-pressure condition, the intriguingmanner of hydrogen ordering in ice VI has been investigatedonly using decompressed sample to ambient pressure. Also,Fig. 3. Proposed crystal structure of ice XIX based on Pcc2 structure
model.

Fig. 1. Representative experimental paths of dielectric and neutron
diffraction experiments described in the phase diagram of ice obtained
herein. Phase boundaries among ice VI, ice XV, and ice XIX aredescribed by black solid lines, based on dielectric experiments (red andblue squares correspond to phase transition temperatures from ice VI to
ice XV and XIX, respectively). The dotted line shows the provisional
phase boundary between ice XV and ice XIX.

no previous study reports direct experimental evidence
for the multiplicity of hydrogen-ordered phase of ice VI.
We report a second hydrogen-ordered phase for ice VI, ice
XIX, unambiguously demonstrated by in-situ dielectric andneutron diffraction measurements under high pressure originally developed by our group [1]. Based on a newly obtainedphase diagram of ice VI, XV and XIX (Fig. 1), we revealed
that ice XIX is thermodynamically stabilized by pressurecompared to ice XV.
To investigate hydrogen ordering of ice VI in its stablepressure region, comprehensive dielectric experiments werefirst carried out in the pressure range 0.88–2.2 GPa, using a
newly developed pressure cell. Ice VI was initially obtainedat room temperature and its dielectric properties were determined in both cooling and heating runs in the temperature
range 100–150 K. Neutron diffraction experiments wereconducted at 1.6 and 2.2 GPa, in which ice XIX appears ashydrogen-ordered phase of ice VI based on the dielectric
experiments, using Mito-system at J-PARC [2]. Both coolingand heating runs were conducted at each pressure in thetemperature range 80–150 K.

Phase transitions from ice VI to its hydrogen-orderedphases were observed at around 120–130 K, along withsudden weakening of the dielectric response of ice VI
with decreasing temperature (Fig. 2a). The reason for thisweakening is that hydrogen ordering of ice suppresses
reorientation of water molecules which induces the dielectric response of ice. The transition from ice VI to ice XIX
was also observed in the neutron diffraction experiments,
as appearance of new peaks due to symmetry lowering(Fig. 2b). Some of the new peaks, e.g. those at 2.20 Å and2.26 Å (indicated by blue triangles in Fig. 2b), cannot be
explained by the structure of ice XV. This is unambiguous
evidence that ice VI has a hydrogen-ordered phase distinct
from ice XV, and we named this unknown phase as ice XIX.
Based on the phase boundary of ice VI and its hydrogenordered phases, ice VI contracts upon hydrogen ordering,which thermodynamically stabilizes ice XIX in the higherpressure region compared to ice XV because of its smaller
volume than ice XV.
In addition, from our structural analysis, two structuralmodels, whose space groups are P 4 and Pcc2, are the mostplausible for the crystal structure of ice XIX (the Pcc2 structural model is shown in Fig. 3). It should be noted that the
proposed structure models intrinsically include hydrogenatoms whose site occupancy is 50 %; in other words, themodels exhibit that ice XIX is partially ordered state.
This indicate a possibility that there exists another fullyhydrogen-ordered phase of ice VI instead of the partiallyhydrogen-ordered ice XIX considering the third law ofthermodynamics. Considering the suggested space group of
ice XV, P 1 or Pmmn, centrosymmetry of hydrogen configurations is the most significance difference in hydrogenconfiguration between ice XIX and ice XV. Such symmetry
difference would induce intriguing difference of physicalproperties between ice XIX and XV in terms of such as optic
and dielectric.
References[1] R. Yamane, K. Komatsu, J. Gouchi, Y. Uwatoko, S. Machida,
T. Hattori, H. Ito, and H. Kagi, Nat. Commun. 12, 1129 (2021).
[2] K. Komatsu, M. Moriyama, T. Koizumi, K. Nakayama, H. Kagi,
J. Abe, and S. Harjo, High Press. Res. 33, 208 (2013).

Fig. 2. a Dielectric constant and dielectric loss of HCl-doped ice VI and
its hydrogen-ordered phase (ice XIX) obtained at 1.9 GPa upon cooling.
b Neutron diffraction patterns of ice VI and XIX obtained at 1.6 GPa in
the cooling run. Only an expanded area showing new peaks of ice XIX
is displayed. The blue and black ticks represent all the peak positions
expected from the unit cells of ice XIX and ice XV, respectively. Blue
triangles indicate new peaks at 2.20 Å and 2.26 Å, which do not appear
from the unit cell of ice XV.

Authors
R. Yamanea, K. Komatsub, J. Gouchi, Y. Uwatoko, S. Machidac,
T. Hattorid, H. Itob, and H. Kagib
aTohoku University
bThe University of Tokyo
cNeutron Science and Technology Center, CROSSdJ-PARC Center, Japan Atomic Energy Agency

ISSP Activity Report 202045

Fabrication of a Compact
Cubic-Anvil Pressure cell
N. Fujiwara and Y. Uwatoko
We have succeeded in fabricating the smallest cubic-anvilpressure cell (CAPC) to date. This miniaturization allowed
us to investigate physical properties at high pressures of over
4 GPa under a magnetic field [1, 2].
In strongly correlated electron systems, one of the mostintriguing topics is the quantum phase transition. Unlike
a conventional thermally induced phase transition, thisphase transition is driven via quantum fluctuations at zerotemperature, leading to an unconventional ground state evenat finite temperatures. Pressure is a representative parameter as well as carrier doping in this phase transition. At low
pressures below 3-4 GPa, a piston-cylinder pressure cell
(PCPC) has been most widely used for various experiments
because of its large sample space. However, this pressure
cell is unavailable at high pressures above 4 GPa. The CAPC
marks high hydrostaticity among pressure cells available atpressures above 4 GPa. Conventionally, the CAPC has notbeen suitable for measurements that require a magnetic field
due to its large body size. In fact, the CPAC has been usedmainly for resistivity or alternating-current susceptibility andrecently for neutron-scattering measurements at zero field[3].
We have fabricated the smallest PCAC to date using ϕ60
NiCrAl guide blocks and investigated pressure homogeneityfrom 63Cu nuclear-quadrupole-resonance (NQR) linewidthof Cu2O. The NQR frequency is proportional to the electricfield gradient at a 63Cu site and the spectral shape is sensitive to local disorder or inhomogeneity. Therefore, the NQR
measurements are available for investigating hydrostaticity
inside the pressure cell.
Figure 1(a) shows a sectional view of the CAPC, and Fig.
1(b) shows a bird’s-eye view of three WC anvils mounted
on the ϕ60 NiCrAl guide block. The four WC anvils are
fitted in the NiCrAl sliding blocks covered with Teflon
sheets. The four anvils move toward the 6.0-mm pyrophyllite cube without friction when the load is imposed on the
NiCrAl guide blocks. The cube is made of lower and upper
pyrophyllite gaskets and contains a ϕ3.0 Teflon capsule (seethe inset of Fig. 2(a)). A single coil wound around Cu2O
power samples is inserted into the Teflon capsule filled

Fig. 1. (a) Sectional view of a cubic anvil pressure cell (CAPC) with
ϕ60 NiCrAl guide blocks. (b) A bird’s-eye view of three WC anvils anda pyrophyllite cube mounted on the lower NiCrAl guide block.

46

ISSP Activity Report 2020

Fig. 2. (a) Bird’s-eye view of a ϕ3.0 Teflon capsule mounted on apyrophyllite gasket. A nuclear-quadrupole-resonance (NQR) coilwrapped around powder samples of Cu2O is inserted into the capsule.
The inset shows upper and lower gaskets and a Teflon capsule. (b)Overview of the ϕ3.0 Teflon capsule on the gasket. The inset shows theϕ2.0 Teflon capsule used for the resistivity measurements.

with pressure transmitting media, the mixture of fluorinate
FC-70 and FC-77 (see Fig. 2(a)). An overview of the ϕ3.0
Teflon capsule on the gasket is shown in Fig. 2(b). The
Teflon capsule has a ϕ2.5 × 1.5 mm sample space and issignificantly larger than that used for conventional resistivity
measurements (see the inset of Fig. 2(b)).
Figure 3(a) shows the 63Cu-NQR spectra of Cu2O
measured at room temperature with a conventional spectrometer and the ϕ60 CAPC. The spectra were obtained using thefast Fourier transform of the spin-echo signal. Figure 3(b)shows the pressure dependence of the NQR linewidth. The
linewidth for the CAPC is compared with that for the PCPC.
The NQR spectra for the PCPC exhibited double-peaks
structure above 2 GPa [1], and the data below 2 GPa wereplotted in Fig. 3(b). The linewidth for the PCPC increases
with increasing pressure above 0.8 GPa where the mixture of
the FC-70 and FC-77 begins to freeze, whereas that for the
CAPC saturates at high pressures above 4 GPa. The pressure
homogeneity for the CAPC is better than that for the PCPC
in a high-pressure regime. This result suggests that pressure
application from multiple directions suppress the inhomogeneity much more effectively than uniaxial pressure application.
In conclusion, we have fabricated a CAPC having a
diameter of 60 mm, the smallest cubic-anvil cell to date,
which allowed us to measure physical properties under amagnetic field utilizing a superconducting magnet witha large-bore sample space greater than 100 mm. In thispressure cell, a large sample space having ϕ2.5 × 1.5 mm
was secured. This pressure cell would open a new avenue forthe quest for novel pressure-induced phenomena in strongly
correlated systems.

Fig. 3. (a) 63Cu-NQR spectra of Cu2O measured with the CAPC atroom temperature. (b) Half width at half maximum of the NQR spectra
measured using the CAPC (black open circles) and NiCrAl pistoncylinder pressure cell (blue open circles). The curve is a guide for theeye.

References[1] S. Nakagawa, J. Gochi, T. Kuwayama, S. Nagasaki, T. Takahashi,
J. Cheng, Y. Uwatoko, and N. Fujiwara, Rev. Sci. Instru. 91 073907(2020).
[2] N. Fujiwara and Y. Uwatoko, Butsuri 76 295 (2021).
[3] S. E. Dissanayake, M. Matsuda, K. Munakata, H. Kagi, J. Gouchi,
and Y. Uwatoko, J. Phys.: Condens. Matter 31 384001 (2019).
Authors
N. Fujiwaraa and Y. Uwatoko
aKyoto University

Magnetoelectric Effect in the
Antiferromagnetic Ordered Stateof Ce3TiBi5 with Ce zig-zag Chains
M. Shinozaki, G. Motoyama, and Y. Uwatoko
Some magnetoelectric effects, including the Edelsteineffect, often occur in the materials without some inversion
symmetry. Materials exhibiting such cross-correlation are
expected as various new functional materials. Recently,
a new magnetoelectric effect is attracting attention in themetallic antiferromagnetic compound, in which the spatial
inversion symmetry is broken at the magnetic site. This new
cross-correlation is understood as a phenomenon that appears
as a result of the realization of odd parity multipole [1, 2].
We discovered a new antiferromagnetic heavy fermion
compound Ce3TiBi5 in which the local inversion symmetryat cerium site is broken (Figs. 1(a) and (b)). The crystal
structure of Ce3TiBi5 is P63 /mcm, and the global inversion
symmetry is maintained. Therefore, the current-induced
magnetization phenomenon in the sense of the Edelsteineffect does not occur. Ce3TiBi5 has only one cerium site, andthe cerium forms zigzag chains along the c-axis. The antiferromagnetic ordering temperature of TN is 5.0 K, electricalresistivity, magnetic susceptibility, and specific heat show a

Fig. 1. (a) Top view of the crystal structure of Ce3TiBi5. (b) Schematicside view of the crystal structure, where only Ce ions on a front side
are drawn for clarity. Green line denotes a unit cell. Black circles
indicate the position of the inversion center. (c) Magnetic structureon the Ce-zigzag chain, where the unit cell does not change even at
the ordered state. Orange arrows on the Ce ions indicate the expectedordered magnetic moments below TN. The red mark denotes a toroidal
moment on a Ce ion at the ordered state, which is a candidate as arealized odd multipole state on Ce3TiBi5.

distinct anomaly, respectively. Some odd parity multipoles
are expected in the antiferromagnetic state, although themagnetic structure has not yet been determined (Fig. 1(c)).
We performed the magnetization measurements with
applying several constant electric currents parallel to thec-axis of Ce3TiBi5 at around TN using commercial magnetometer of MPMS. In this measurement, slight static
magnetic field was applied to determine the sample position.
Current-induced magnetization (MME) was obtained fromsubtracting magnetization induced by applying slight static
magnetic field and zero electric current as blank magnetization.
We have succeeded in measuring the current-induced
magnetization only on the antiferromagnetic state [3, 4].
Figure 2(a) shows the temperature (T) dependence of MME
on Ce3TiBi5. It is found that MME(T) starts to appear justbelow TN with decreasing T, although it is almost independent of temperature and is approximately zero above TN.
This T dependence was also observed at several electricalcurrent (i), and then we show plots of MME versus i at 3.0 K
in Fig. 2(b) to discuss the i dependence of the magnitude of
MME. MME shows the linear i dependence, which suggeststhat MME on Ce3TiBi5 linearly increases with an increase in
the electric field.
Next, T dependence of MME at several magnetic field(H) is shown in Fig. 2(c). MME(T) exhibits an identical curve
despite a difference in the magnitude of H. The magnitude of
MME at each magnetic field and T = 3.0 K was decided from
the MME(T) at several magnetic fields (5 ≤ H ≤ 40 Oe) and isplotted in Fig. 2(d). The magnitude of MME is independent of
H in this field range, which indicates that MME has a similarvalue even in zero magnetic field.
The current-induced magnetization was observed only
below the antiferromagnetic transition temperature of 5.0 K.
This current-induced magnetization exhibits linear dependence with respect to the DC electric current and demonstrates little dependence on the magnetic field, i.e., thebehavior persists even in zero magnetic field. Based on theseFig. 2. (a) Comparison of the T dependence of the MME between several
i for sample A. (b) i dependences of MME at 3 K for samples A and B.
(c) Comparison of the T dependence of MME between different H. (d) H
dependence of MME at 3 K.

ISSP Activity Report 202047

results, we suggest that the current-induced magnetization
originated from the magnetoelectric effect of the odd multipole state on the Ce-zigzag chain structure. Meanwhile, thesign and magnitude of the slope of i dependence of MME has
large sample dependence as shown in Fig. 2(b). We consider
the sample dependence to be explained by the imbalance ofthe domain structure of the AFM state. However, we do notknow what kind of domain structure is realized in the antiferromagnetic state. We are conducting experiments with aninterest in the consistency between the realized odd parity
multipole state on Ce3TiBi5 and the current-induced magnetization measurements with various geometry.
References[1] S. Hayami, H. Kusunose, and Y. Motome, Phys. Rev. B 90, 024432(2014).
[2] H. Saito, K. Uenishi, N. Miura, C. Tabata, H. Hidaka, T. Yanagisawa, and H. Amitsuka, J. Phys. Soc. Jpn. 87, 033702 (2018).
[3] M. Shinozaki, G. Motoyama, M. Tsubouchi, M. Sezaki, J. Gouchi,
S. Nishigori, T. Mutou, A. Yamaguchi, K. Fujiwara, K. Miyoshi, and Y.
Uwatoko, J. Phys. Soc. Jpn. 89, 033703 (2020).
[4] H. Saito, H. Amitsuka, G. Motoyama, and M. Shinozaki, Solid
State Physics 55, 611 (2020).
Authors
M. Shinozakia, G. Motoyamaa, J. Gouchi, S. Nishigoria, T. Mutoua, A.
Yamaguchib, K. Fujiwaraa, K. Miyoshia, and Y. Uwatoko
aShimane University
bUniversity of Hyogo

High Precision Studyof the Anderson Transition
T. Ohtsuki and K. Slevin
More than six decades have passed since Anderson’s
seminal paper on localization. During the subsequent
decades, there have been numerous important discoveries including weak localization, universal conductancefluctuations, and the scaling theory of localization. Since
the proposal of the scaling theory, determining the criticalbehavior of the localization-delocalization transition, which
is usually referred to as the Anderson transition (AT), hascontinued to attract considerable attention.
One of the most widely used approaches to study the
AT quantitatively is to calculate the Lyapunov exponents(LE’s) and to analyze them using finite size scaling. Large
scale computations using the supercomputer System B at
ISSP have enabled us to calculate LE’s with high precisions
for very large system sizes. We consider a system of size
Lx × L × L, which we divide into layers of an L × L square.
The transfer matrix M relates the wave functions on the 1st
layer to Lxth layer, and the LE’s are the eigenvalues of thematrix. From the smallest positiveLE, γ, we define a quantity Γ = γL.
The conventional method requires the simulation ofa single very long sample. While this method has been
employed very successfully in numerous simulations overthe preceding decades [1], the calculations are inherently
serial and do not allow us to take advantage of massively
parallel computing. We devised an alternative method tosimulate an ensemble of much shorter samples and take anensemble average, allowing us to make full use of System B.
We have analyzed the LE’s using finite size scaling,and estimated the critical exponent for the divergence ofthe correlation length, ν = 1.572 [1.566,1.577] for three
dimensional (3D) Anderson model of localization [1,2],

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ISSP Activity Report 2020

Fig. 1. Γ as a function of the disorder strength W in the 3D Andersonmodel of localization for various cross section size L = 12.18, 24, 32,
48 and 64. L = 96 is underway using new System B.

H = Σi εi | i〉〈i | − Σ〈i,j〉| i 〉〈 j | , where εi is the onsite random
potential distributed uniformly in [-W ⁄ 2, W ⁄ 2]. We fit the W
and L dependence of Γ using finite size scaling (Fig. 1).
The critical exponent changes when a magnetic field isapplied. This can be realized by inserting Peierls phase in thenearest neighbor transfer. We obtain ν = 1.443 [1.437,1.449]
which is distinctly different from the case without a magnetic
field [3].
At the critical point, the wave functions exhibit multifractality, hence the local density of states fluctuates significantly. If we consider dilute magnetic impurities, the Kondo
temperature TK varies from one magnetic impurity to anotherdue to the large fluctuations of wave functions (Fig. 2).
We have calculated the local density of states at the criticalpoint using the kernel polynomial method and calculated the
Kondo temperature distribution [4]. The massively parallel
calculations on System B enabled us to reach the small TK
needed to check the analytic prediction.
In addition to the cases of Anderson’s model of localization with and without magnetic fields, depending on whether
we have spin-rotation symmetry, chiral symmetry as wellas particle-hole symmetry, we have 10 symmetry classes
for random quantum systems. In recent years, thenon-Hermitian systems with randomness, which are classified into 38 symmetry classes, are attracting renewed interests. We have studied the critical behaviors of AT with chiralFig. 2. Schematic of a magnetic impurity and a multifractal wave
function.

and/or particle-hole symmetries [5], and most of the criticalexponents for the AT in 3D are now determined. In addition,
we have verified that the transfer matrix method and thefinite size scaling work for non-Hermitian systems. We are
now studying the localization-delocalization transition for
non-Hermitian systems [6,7] and determining the criticalexponents, which might explain the critical behavior of light
localization.
References[1] K. Slevin and T. Ohtsuki, New J. Phys. 16, 015012 (2014).
[2] K. Slevin and T. Ohtsuki, J. Phys. Soc. Jpn. 87, 094703 (2018).
[3] K. Slevin and T. Ohtsuki, J. Phys. Soc. Jpn. 85, 104712 (2016).
[4] K. Slevin, S. Kettemann, and T. Ohtsuki, Eur. Phys. J. B 92, 281(2019).
[5] X. Luo, B. Xu, T. Ohtsuki, and R. Shindou, Phys. Rev. B 101,
020202 (2020).
[6] X. Luo, T. Ohtsuki, and R. Shindou, Phys. Rev. Lett. 126, 090402(2021).
[7] X. Luo, Z. Xiao, K. Kawabata, T. Ohtsuki, and R. Shindou,
arXiv:2105.02514.
Authors
T. Ohtsukia and K. Slevinb
aSophia University
bOsaka University

spectrometer of HRC at J-PARC. Our temperature-dependent measurements show that CoPS3 does not show the
spin-orbit exciton expected near 30 meV at high temperature in stark contrast with initial expectations. Figure 1
shows the temperature dependence of magnetic excitations. Above TN = 122 K, there is no sign of excitations
near 30 meV. This can only be interpreted as evidence forthe ground state of CoPS3 being an S = 3/2 state, not the
spin-orbital entangled Jeff = 1/2 state. Figure 2 shows
the spin-wave spectrum of CoPS3 with incident neutronenergy Ei = 71 meV. The measured spin-wave spectrum
shows two magnon branches over 40 meV with a massive
13 meV spin gap. Also, the spin-wave spectrum shows
extra gap-like features at 24~27 meV. Based on the former
analysis about temperature dependence of magnetic excitations, we use magnetic Hamiltonian with S = 3/2 system toexplain the spin-waves of CoPS3. This magnon was wellfitted using an anisotropic Heisenberg (XXZ) model with areasonable anisotropy coefficient α ≡ Jz/Jx = 0.6 and strong
easy-axis single-ion anisotropy K = 2.4 meV along the aSpin Waves in the Two-Dimensional
Honeycomb Lattice XXZ-Type van der
Waals Antiferromagnet CoPS3
C. Kim, J. G. Park and T. Masuda
The recent introduction of magnetic van der Waals(vdW) materials has opened new and novel opportunities to
examine the low-dimensional magnetism in real materials.
In particular, TMPS3 (TM = Mn, Fe, Co, Ni) family has
attracted special interests in the community as a class of
antiferromagnetic 2D vdW materials. The crystal structureof TMPS3 is a monoclinic structure with a C 2/m spacegroup, where a weak vdW force couples honeycomb layerswith edge-shared TMS6 octahedra on the ab-plane along
the c-axis. Since magnetic structure and exchange interactions in TMPS­3 depend on the TM elements, they provide an
excellent playground to validate spin dynamics theory in low
dimensions experimentally.
CoPS3 has been less studied among them due to thedifficulty in synthesizing high-purity samples [1]. Therefore,
the magnetic Hamiltonian of CoPS3 has been unknown so
far and needs investigation. CoPS3 has antiferromagnetic
phase transition at TN = 122 K with zig-zag magnetic order.
The spins are aligned along the a axis with a small canting
to the c axis. The magnetic susceptibility shows a difference
between H // ab and H // c in the paramagnetic state, which
implies XY-like anisotropy [1].
Moreover, Co2+ magnetic systems have recently drawn
significant attention because Co compounds may host Kitaev
interactions [2]. A spin-orbital entangled state is an essential
ingredient to realize the Kitaev interactions, which can beverified by measuring spin excitations. Typically, a spinorbit exciton, the crystal field excitation between Jeff = 1/2 to
3/2 state, is strong evidence of a spin-orbital entangled state.
Most cobalt compounds have such excitation at 20~30meV,
proportional to the strength of spin-orbit coupling of cobalt[3].
In this study [4], we examined such a possibility
using inelastic neutron scattering at the time-of-flight

Fig. 1. (a-f) Magnon spectra of CoPS3 at different temperatures with
Ei = 71.3 meV.

Fig. 2. The experimental INS data of CoPS3 measured at T = 8 K with
Ei = 71.3 meV is shown in (b). (a), (c) The best-fit magnon spectra with
the XXZ model and the isotropic Heisenberg model. An instrumental
energy resolution of 3 meV was used to convolute the theoreticalresults shown in (a) and (c). Horizontal and vertical white boxes
denote the integration range for the constant-E and constant-Q cuts in(d-g), respectively. (d), (e) Constant-Q cut at the momentum range of
Q = [1.7 1.8] and Q = [2.2 2.3] Å-1 for the measured data with thebest-fit simulations. (f), (g) Constant-E cut with the energy range of
E = [13 16] and E = [24 27] meVISSP Activity Report 2020

49

axis. The magnetic structure from our magnetic Hamiltonian also consistent with the reported magnetic structure.
In summary, our experiment and theoretical analysis suggest
CoPS3 as another exciting platform to study anisotropic
XXZ-type spin Hamiltonian in the honeycomb antiferromagnet. Moreover, it provides an excellent playground for
future investigation of low-dimensional magnetism withmagnetic van der Waals materials.
References[1] A. R. Wildes et al., J. Phys.: Condens. Matter 29, 455801 (2017).
[2] H. Liu et al., Phys. Rev. B 97, 014407 (2018).
[3] K. Tomiyasu et al., Phys. Rev. B 84, 054405 (2011).
[4] C. Kim et al., Phys. Rev. B 102, 184429 (2020).
Authors
C. Kima, J. Jeonga, P. Parka, T. Masuda, S. Asai, S. Itohb, H. S. Kimc,
A. Wildesd, and J. G. ParkaaSeoul National University
bKEK
cKangwon National University
dInstitut Laue-Langevin

Quantum Spin Liquid Statein a Square-Kagome Antiferromagnet
M. Fujihala, K. Morita, and T. Masuda
New insight into the spin behavior in an exotic state ofmatter puts us closer to next-generation spintronic devices.
The quantum spin liquid (QSL) state is an exotic state ofmagnet where the spin of electrons, which generally exhibitsorder at low temperatures, remains disordered. Observation of a QSL state is one of the most important goals incondensed-matter physics. However, the QSL state in
two-dimensional (2D) systems has not been clearly observedin real materials owing to the presence of site-mixing
disorder or deviations from ideal models. The lack of asuitable model material exhibiting the QSL hinders observations of the QSL state in the 2D spin-1/2 systems.
Square-kagome lattice (SKL) magnet is known as thehighly frustrated 2D system. There is a possibility that the
QSL ground states are realized in the antiferromagnetic S= 1/2 Heisenberg model on SKL [1]. However, the lackof a model compound for the SKL system has obstructeda deeper understanding of its spin state. Motivated by
the present status on the study of the SKL system, we

Fig. 1. (a) Crystal structure of KCu6AlBiO4(SO4)5Cl. Square-kagome
lattice consisting of the Cu2+ ions with nearest-neighbor exchange
couplings J1, J2, J3 and next-nearest-neighbor exchange coupling JX.
(b) Crystal structure of KCu6AlBiO4(SO4)5Cl featuring a large interlayer spacing.

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ISSP Activity Report 2020

Fig. 2. (a) INS spectra at 5 K observed using HRC with an incident
neutron energy of 45.95 meV. (b) INS spectra at 0.3 K observed using
AMATERAS with incident neutron energy of 3.14 meV.

searched for compounds with the SKL containing Cu2+
spins, and synthesized the first compound of a SKL
antiferromagnet, KCu 6 AlBiO 4 (SO 4 ) 5 Cl, successfully[2]. As shown in Fig. 1(a), the SKL in the crystal structure of KCu6AlBiO4(SO4)5Cl comprises the Cu2+ ions.
In each SK unit, the square is enclosed by four scalene
triangles. From this crystal structure, it is recognized that
KCu6AlBiO4(SO4)5Cl has three types of first neighborinteractions, J1, J2 and J3, as shown in Fig. 1(a). By comprehensive experimental studies via magnetic susceptibility,
magnetization, heat capacity, and muon spin relaxation, we
confirm that the absence of magnetic long-range order down
to 58mK, roughly three orders of magnitude lower than the
NN interactions.
The quantum statistics of quasiparticle excitations dependon the type of QSL, in particular, the nature of their excitation. To grasp the whole picture of the spin excitation, we
performed the inelastic neutron scattering (INS) experiments using the high-resolution chopper spectrometer HRC
and cold-neutron disk chopper spectrometer AMATERAS
installed in the MLF at J-PARC. As shown in Fig. 2(a), flat
signals at around E = 10 and 7 meV are observed at 5 K.
The signal due to magnetic excitation is generally enhanced
at low-Q values, whereas phonon excitation is dominant at
high-Q. The signals at around 10 and 7 meV increase withdecreasing with Q, indicating that it comes from magnetic
excitation. As shown in Fig. 2(b), streak-like excitation at
Q = 0.8, 1.25, and 1.58 Å-1 is clearly visible down to theelastic line, and its intensity increases continuously without
signature of energy gap at least within the instrumental
resolution. These INS data are consistent with a gapless
continuum of spinon excitations. From the above, the flat
signals at 10 and 7 meV probably indicate a van Hove singularity of spinon continuum edges at this energy.
Our experimental results strongly suggest the formation of a gapless QSL in KCu6AlBiO4(SO4)5Cl at very low
temperature close to the ground state; however, they areinconsistent with the theoretical studies based on the J1-J2-J3
SKL Heisenberg model. We calculate the dynamical spin
structure factor S(q, ω) in the SKL model with various valuesof the parameters, but we could not reproduce the INS experimental results. Therefore, in order to realize the QSL statein the SKL, we must impose an additional condition such as
longer-range exchange interactions. Further experimental
and theoretical study would reveal the conditions inducing
the QSL state in SKL antiferromagnets.
References[1] K. Morita et al., J. Phys. Soc. Jpn. 87, 043704 (2018).
[2] M .Fujihala et al., Nat. Commun. 11, 3429 (2020).
Authors
M. Fujihalaa, K. Moritaa, R. A. Moleb, S. Mitsudaa, T. Tohyamaa, S.

Yanoc, D.H. Yub, S. Sotad, T. Kuwaie, A. Kodaf, H. Okabef, H. Leef, S.
Itohf, T. Hawaif, T. Masuda, H. Sagayamaf, A. Matsuo, K. Kindo, S.
Ohira-Kawamurag, and K. Nakajimag
aTokyo University of SciencebANSTOcNSRRCdRIKENeUniversity of Toyama
fKEK
gJ-PARC CenterTwo-step Magnetic Anomaly
in the High Field Magnetization
Process in Yb1+xIn1−xCu4
S. Yamanaka, A. Matsuo, and C. Michioka

electrical resistivity ρ of Yb1+xIn1-xCu4. In all compositions,ρ rapidly decreases below the valence transition temperature due to decrease in magnetic scattering accompanied
by decrease in the localized moment of Yb3+. The valencetransition temperature seems to shift to higher temperature with increasing x, consistent with behaviors of χ. For
x = 0.21 and x = 0.25, ρ reaches a minimum value at approximately 40 K and then increases with decreasing temperature. These behaviors are typical in a metallic state with an
impurity-Kondo-effect in which ρ shows -lnT dependence. It
is natural to think that in the Yb-rich phase such as x = 0.21
or 0.25, all the Yb ions could not behave homogeneously anda part of Yb ions remain trivalent with an impurity moment.
Figure 3 shows the magnetization curve of Yb1+xIn1-xCu4
measured at 4.2 K up to 72 T. For x = 0.16, 0.15, and 0.20,
two-step magnetic anomalies are observed in the high fieldmagnetization process. If this originates from phase separation, three or more steps would frequently appear. However,no such a behavior was observed in the results of morethan 20 samples. In addition, the magnetization value for
x = 0.16, 0.15, and 0.20 reaches 2 μB after the first step andreaches 4 μB after the second step. The fact that the similar
behavior was observed in all three compounds suggests thatthe magnetic moments of the plateaux may be meaningful.
Although the changes in the magnetic transition field bysubstitutions in YbInCu4 have been reported, their magnetictransitions are all one step. The present observation of a
successive phase transition in this system is the first time.
The temperature dependences of χ and ρ do not show a
behavior corresponding to the two-step anomaly. An intermediate phase is induced only by the magnetic field. The degen-

The intermetallic compound YbInCu4 exhibits a firstorder valence transition at 42 K under ambient pressure;Ytterbium ions have trivalent local moments in the hightemperature phase, and they become a mixed-valence stateof an average valence of 2.9 in the low-temperature phase [1,2]. In addition, a magnetic field-induced valence transition
also occurs below 42 K with the transition field of ~30 T [3,4]. To clarify the mechanism of the valence transition, substitution effects in Yb or In site have been extensively studied[3, 5]. Although this system was originally discovered asa solid solution RCu2 without site-ordering, there are few
reports on the substitution of In site by Yb itself on YbInCu4.
In this study, the magnetic and transport properties of
Yb1+xIn1-xCu4 are investigated using polycrystalline samples
synthesized by the arc melting method, and the magnetic
phase diagram in Yb1+xIn1-xCu4 is investigated.
Figure 1 shows the temperature dependence of themagnetic susceptibility χ of Yb1+xIn1-xCu4 measured in amagnetic field of 1 T. In a parent material, Yb1.01In0.99Cu4, χ
rapidly decreases below 42 K due to decrease in the effective
valence of Yb ion from trivalent, which is consistent withthe previous report [1]. The sharp magnetic anomaly accompanied by the valence transition in Yb1.01In0.99Cu4 seems tochange to a broad shape and shift to a higher temperature
with increasing x. In all compositions, χs obey the CurieWeiss law above 150 K, and the values of the effective
magnetic moment estimated from Curie-Weiss fits roughly
agree with the calculated value for free Yb3+ ion, 4.54 μB.
This fact confirms that the valence state of Yb ions in thehigh-temperature phase is trivalent.
Figure 2 shows the temperature dependence of theFig. 2. Temperature dependence of the electrical resistivity ρ ofYb1+xIn1-xCu4..

Fig. 1. Temperature dependence of the magnetic susceptibility χ ofYb1+xIn1-xCu4 measured in a field of 1 T.

Fig. 3 Magnetization curves M -H of Yb1+xIn1-xCu4 measured at 4.2 K
up to 72 T.

ISSP Activity Report 2020

51

erated ground state of Yb3+ (2F7/2) is split by the crystal
electric field (CEF) effects, and each state has a different
saturation magnetization. In x = 0.16, 0.15, and 0.20, thelower transition field induces the trivalent state however themagnetic moment is limited by CEF. Subsequently in thehigher transition field, the Zeeman- energy exceeds CEF andinduces a full saturation magnetization of Yb3+ of 4 μB. For
x = 0.01 and 0.10, the magnetization reaches about 4 μB ina one-step transition without an intermediate phase. This isprobably because CEF of small substituted compounds issmaller than the magnetic transition field which induces thetrivalent state.
In conclusion, we discovered the successive magnetictransition in the magnetization process in Yb1+xIn1-xCu4(x = 0.15, 0.16, and 0.20) and proposed that it originatesfrom competition and corporation of the Zeeman energy,
CEF effect and magnetic interactions.
This study was selected for the 22nd distinguished paper
award sponsored by Japan Society of Powder and Powder
Metallurgy.
References[1] I. Felner and I. Nowik, Phys. Rev. B 33, 617 (1986).
[2] B. Kindler, D. Finsterbusch, R. Graf, F. Ritter, W. Assmus, and B.
Lüthi, Phys. Rev. B 50, 704 (1994).
[3] K. Yoshimura, T. Nitta, M. Mekata, T. Shimizu, T. Sakakibara, T.
Goto, and G. Kido, Phy. Rev. Lett. 60, 851 (1988).
[4] T. Shimizu, K. Yoshimura, T. Nitta, T. Sakakibara, T. Goto, and M.
Mekata, J. Phys. Soc. Jpn. 57, 405 (1988).
[5] J. He, N. Tsujii, M. Nakanishi, K. Yoshimura, and K. Kosuge, J.
Alloys Compd. 240, 261 (1996).
Authors
S. Yamanakaa, T. Nakahigashia, C. Michiokaa, H. Uedaa, A. Matsuo,
K. Kindo, and K. Yoshimuraa
aKyoto Unuversity

magnetocaloric effect, and magnetostriction of Ni-Co-MnGa alloys in pulsed high magnetic fields up to 56 T [4, 5].
As shown in Fig. 1(a), metamagnetic transitions similar
to those in the Ni-Co-Mn-In alloy were observed in thismaterial. Magnetostriction measured on a polycrystalline sample using the capacitance method [7] showed asignificant lattice distortion associated with this transition[Fig. 1(b)], suggesting that this magnetic transition is accompanied by a structural phase transition from the martensite to
the austenite phase.
The change in the sample temperature at the magnetic
field-induced phase transition shows a negative magnetocaloric effect, as shown in Fig. 2. In contrast to the Ni-Co-MnIn alloy, the negative magnetocaloric effect shows up evenafter completing the field-induced magnetic and structuraltransition. The experimental results of heat capacity andtheoretical results of first-principles calculation show thatthe electronic specific heat coefficient increases significantly
at the transition to the austenite phase: the entropy of theelectron system plays an essential role in the magnetocaloric
effect of this system. The increase in lattice and electronic
entropy associated with the magnetic field-induced phasetransition dominates over the decrease in the spin entropychange, which shows up as a negative magnetocaloric effectthat decreases the sample temperature in a magnetic field. If
we can incorporate these entropy changes in the same sign,
we expect magnetocaloric effects beyond the limit of thespin system. Microscopic discussion in the present study will
pave the way for this giant magnetocaloric effect.
Most of the previous studies on magnetocaloric materials
have focused on their properties in the magnetic field region
below 5 T. In the future society where hydrogen energy andhigh-temperature superconducting cables are put to practicaluse. In this situation, large-scale application of the magneto-

Origin of Inverse Magnetocaloric Effects
in Ni-Mn-based Heusler Alloys
T. Kihara, X. Xu, and M. Tokunaga
The development of heat-exchange systems using themagnetocaloric effect is a topic where material sciencecan solve energy problems. The magnetocaloric effecthas long been used to realize ultra-low temperature using
the adiabatic demagnetization procedure. This effect wasrecently expected for heat exchangers with higher efficiency
than conventional gas-compression/expansion systems[1]. However, most of the materials that exhibit significant
magnetocaloric effect contain heavy rare-earth elements, sothat the high cost of the materials hinders their practical use.
We have studied thermodynamic properties of Heusler alloys
without rare-earth elements to realize the giant magnetocaloric effect involving the entropy of the lattice and electronicsystems [2-5].
Ni-Mn-based Heusler alloys have attracted considerable attention as magnetic shape memory alloys [6]. In ourprevious work on Ni-Co-Mn-In alloys, we directly observed
prominent negative magnetocaloric effects at the fieldinduced phase transitions from paramagnetic martensite toferromagnetic austenite phase. From the systematic highfield studies of magnetocaloric effect, magnetization, heat
capacity, and microscopy, we concluded that this effect originated from the increase of lattice entropy associated with thestructural phase transition [2].
In the present study, we measured the magnetization,

52

ISSP Activity Report 2020

Fig. 1. (a) Field-dependence of magnetization in a polycrystal of
Ni41Co9Mn31.5Ga18.5 at several temperatures. Steep increase in magnetization indicates emergence of metamagnetic transitions. (b) Longitudinal magnetostriction of Ni41Co9Mn31.5Ga18.5 measured at 290 K. The
inset shows schematics of the capacitance method. Prominent increaseof the sample length corresponds to the structural transition from themartensite to the austenite phase simultaneously with the metamagnetictransition.

Fig. 2. Magnetocaloric effect of Ni 41Co9Mn31.5Ga18.5 studied inadiabatic magnetization process realized in pulsed magnetic fields.
Instantaneous change in sample temperature is detected using a thinfilm resistive thermometer attached to the sample. In addition to steep
reduction of temperature at the metamagnetic transition (ΔTIMT),
further negative magnetocaloric effect is observed at higher fields(ΔT*).

caloric effects using large superconducting magnets, such as
gas liquefaction projects, will also be important. The evaluation of the magnetocaloric effects in Heusler alloys at highmagnetic fields provides an essential hint for solving energy
problems in near future.
References[1] K. A. Gschneidner Jr., V. K. Pecharsky, and A. O. Tsokol, Rep.
Prog. Phys. 68, 1479 (2005).
[2] T. Kihara et al., Phys. Rev. B 90, 214409 (2014).
[3] X. Xu et al., MATEC Web of Conf. 33, 01004 (2015).
[4] T. Kihara et al., Scr. Mater. 181, 25 (2020).
[5] T. Kihara et al., Phys. Rev. Mater. 5, 034416 (2021).
[6] R. Kainuma et al., Nature 439, 957 (2006).

[7] A. Miyake et al., Rev. Sci. Instrum. 91, 105103 (2020).

Authors
T. Kiharaa, T. Roya, X. Xua, A. Miyake, M. Tsujikawaa, H. Mitamura,
M. Tokunaga, Y. Adachib, T. Etoc, and T. KanomatadaTohoku University
bYamagata University
cKurume Institute of Technology
dTohoku Gakuin University

field HP ≈ 15.6 T (HP = 1.84 Tc), and the Zeeman energy
at Hc2 becomes comparable with the superconducting gap
ΔSC (μBHc2 ~ ΔSC). In addition, high-quality FeSe single
crystals are found to be in the clean limit with a much longer
mean free path l than the superconducting coherence lengthξ (l >> ξ). More importantly, FeSe is in the so-called
BCS-BEC (Bose-Einstein condensate) crossover regime(ΔSC~EF) with exceptionally small Fermi energies. The spin
imbalance reaches up to ~ 40% for one of the Fermi surfaces(FSs) at Hc2ab ≈ 25 T, much larger than the typical value ofa few % in other superconductors. Therefore, FeSe can bea model system to study whether, and if so how, competing
magnetic or superconducting instabilities trigger exotic fieldinduced phases in multiband superconductors with a large
spin imbalance.
In this work, using torque magnetometry, specific heat,and magnetocaloric measurements, we identified successive
anomalies with increasing in-plane magnetic field, below
Hc2 at low temperatures and in the clean limit. The signatures of unusual phase transitions below Hc2ab and below
T *≈ 2 K are observed in the field-dependent torque magnetometry τ (H). The torque magnetometry in superconductors usually exhibits a typical saw-tow shaped curve of the
field derivative τ (H), dτ/dH due to vortex pinning. In FeSe,
however, we observed two additional anomalies at H1~15 T
and H2~22 T, well below the irreversible field Hirr at which
the hysteresis in τ (H) starts to develop (Fig. 1a and 1b).
The transition fields H1 and H2 follow the distinct dependence on temperature or field angle from those of Hirr ≈ Hc2(Figs. 1a and 1c). Upon increasing temperature or the tilting
angle of the magnetic field (θ) from H || ab, Hirr systematically decreases, similar to Hc2. In contrast, the anomalies
are pronounced only at low temperatures below T * and near
H || ab with θ ≤ 15o. Also, the transition fields H1 and H2
remain almost the same with variation of temperature or
field angle (Figs. 2a and 2b). The anomalies seen in torquemagnetometry are further confirmed by magnetocaloric
and specific heat measurements [1]. These findings clearly
evidence the presence of field-induced phases near thein-plane magnetic fields below Hc2ab.

Observation of In-Plane Magnetic Field
Induced Phase Transitions in FeSe
J. S. Kim, Y. Kohama, and J. M. Ok
In conventional superconductors, spin polarization can
destroy superconductivity when Zeeman energy surpasses
the binding energy of Cooper pairs, known as the Pauliparamagnetic limit. Beyond the Pauli limit, exotic superconducting phases, often coexisting with complex magnetic
orders, have been observed in some unconventional superconductors. Even in these cases, however, field-induced spin
imbalance is usually at most a few %. So far, realization of
the highly spin-imbalanced superconductivity and possible
field-induced exotic phases have been remained elusive,
partly due to the lack of the suitable material candidates.
FeSe is a promising candidate hosting a strongly spin
imbalanced state at high magnetic fields. The observed
in-plane upper critical field of FeSe is Hc2ab ≈ 25 T, well
above the conventional BCS value of the Pauli limiting

Fig. 1. (a) Magnetic field dependent torque τ (H) close to H || ab atvarious temperatures. The irreversibility field at Hirr ~ 25 T and anomalies at H1 ~ 15 T and H2 ~ 22 T are indicated by black, red and blue
arrows, respectively. (b) The field-derivative curve dτ(H)/dH showing
clear anomalies at H1 and H2. (c) Magnetic field dependent torque τ (H)at various field angles.

ISSP Activity Report 202053

Gurevich, and J. S. Kim, Phys. Rev. B 101, 224509 (2020).
AuthorsJ. M. Oka, C. I. Kwona, J. S. Youa, S. K. Parka, K.-S. Kima, J. S. Kima,
Y. Kohama, K. Kindo, J.-H. Kimb, Y. J. Job, E. S. Choic, W. Kangd, E.
G. Moone, and A. GurevichfaPohang University of Science and Technology
bKyungpook National University
cNational High Magnetic Field Laboratory
dEwha Womans University
eKorea Academy Institute of Science and Technology
fOld Dominion University

Hydrogen-Bonded Structure of
Water Responsible for Ion Selective
Permeability of Self-Assembled Liquid
Crystalline Polymer Membranes
Fig. 2. (a,b) Magnetic phase diagram of FeSe for H || ab as a functionof temperature (a) and field orientation (θ) with respect to the abplane (b). The upper critical field Hc2ab (T) (open symbols) are determined by resistivity (black open circle), TDO frequency (black open
diamond), and torque magnetometry (black open star) measurements,
while the field-induced phase transitions at H1 and H2 are obtained bytorque magnetometry (colored open star) and the magnetocaloric effect(colored solid triangle). The inset shows schematics of the possible
nesting effect via q = (0, π) or (π, π) between the spin-split Fermi
surfaces (FSs) with anisotropic superconducting gap (gray shade). Near
H1, the nesting effect is expected between two FSs with opposite spins
via a SDW momentum q = (π, π) (bottom), while the nesting with q =(0, π) is expected near H2 between two FSs with the same spins (top).

One possible candidate for the high field anomalies isthen the FFLO phase. In this case, the Cooper-pair state(k↑, −k+q↓) is formed with a momentum mismatch (q)between the spin-split FSs. In multiband superconductors, each FS has its own FFLO instability with a different
modulation length qi−1 (i, band index), and these instabilities
compete with each other, inducing the multiple FFLO orders
at different magnetic fields. Alternatively, the spin-density
wave (SDW) phase of field-induced quasiparticles can be
another promising candidate. When the superconductivity issuppressed by Pauli pair breaking near the superconducting
gap nodes or minima, the SDW order can be triggered by
the nesting effect by field-induced quasiparticles. Due toan exceptionally small EF, the Zeeman effect results in the
spin-split FSs much different in size, which significantly
affects the nesting condition in FeSe. We found that thenesting via q = (π, π) nicely matches the two different FSs
with opposite spins at H~16 T, and with the same spins at
H~22 T (Fig. 2b). in good agreement with the observed
transition fields, H1 and H2. The incipient spin fluctuations
and strong coupling between the field-induced quasiparticles
may allow the coexisting phase with the SDW and superconductivity.
In the current stage, the detailed nature of the fieldinduced phase transitions, including possible coexistenceof the SDW and the FFLO orders, remains to be clarified.
Nevertheless, these observations clearly demonstrate that
FeSe offers a unique system, in which field-induced phasetransitions occur in the superconducting state. This posesa challenge to our understanding on the complex interplay
between anisotropic superconducting order, incipientmagnetic instabilities, and the multi-band effect in the largely
spin-imbalanced superconducting systems.
Reference[1] J. M. Ok, C. I. Kwon, Y. Kohama, J. S. You, S. K. Park, J. Kim,
Y. J. Jo, E. S. Choi, K. Kindo, W. Kang, K.-S. Kim, E. G. Moon, A.

54

ISSP Activity Report 2020

T. Kato and Y. Harada
Liquid crystals (LC) are appealing for nanofiltration
membranes with uniform subnanopores which enableefficient and thermally stable filtration and ion selectivity[1]. Many principles of water filtration are intuitive: particles
bigger than the pore size cannot pass through a membrane,
and electrostatic interactions between ions, water molecules
and the membrane can aid the process. However, the permeability of these LC membranes is higher for larger, dianionicSO42− ions than it is for monoanionic, smaller Cl− ions,which could not be explained using the common filtration
principles, which implies the presence of another driving
force for ion selectivity. One of such possibility is the structure of the water surrounding the ions
Here we investigated the hydrogen-bonded configurationof water molecules in the subnanopores of a bicontinuous
cubic LC membrane formed by in-situ polymerization ofcompound 1 (Fig. 1a), and how it affects the permeation of
dianionic SO42− and monoanionic Cl−[2]. We used highresolution X-ray emission spectroscopy (XES) [3] to learn

Fig. 1. (a) Molecular structure of an LC monomer (1). The monomers
were self-assembled to form a bicontinuous cubic (Cubbi) LC structure
through which ions are selectively transported. (b) Schematic image ofsoft X-ray emission detection from water in the LC membrane.

Fig. 2. Valence electronic structure of H2O in (a) the LC membrane,(b) 1.0 mol/l and 2.5 mol/l MgSO4, (c) 1.0 mol/l and 3.0 mol/l NaClaqueous solutions.

how water arranges itself in the subnanopores.
XES spectra of pure liquid H2O absorbed in the LC
membrane and hydrating water of permeating solutes,
MgSO4 and NaCl were collected at the SPring-8 BL07LSU
HORNET station using a high-resolution XES spectrometer [4]. A custom-made ambient pressure cell was used to
expose the LC membrane to humidity-controlled moistureand nitrogen as a carrier gas. (Fig. 1b). To explore the originof the selective ion permeation (73±5% for MgSO4 and30±6% for NaCl), hydrogen-bonded structures of H2O in the
LC membrane were compared with those in the MgSO4 andNaCl hydrations. Spectra of water within the subnanopores(Fig. 2a) revealed that its hydrogen-bonded network, when
confined, loses some structural features characteristic of bulk
water in favor of new structural features. Very similar structural features are observed in the spectra of the hydration
shell of SO42− (Fig. 2b) but not in that of Cl− (Fig. 2c). We
interpret this as the reason for the greater membrane permeability of SO42− than that of Cl−. In the near future computational studies might help understand the exact structure of
the hydrogen-bonded network within the subnanopores. The
nature of hydrogen-bonded networks becomes an additionalparameter that should be considered and controlled to obtainhighly efficient water filtrations.
References[1] (a) T. Kato et al., Nat. Rev. Mater. 2, 17001 (2017); (b) T. Ichikawa
et al., J. Am. Chem. Soc. 134, 2634 (2012). (c) M. Henmi et al., Adv.
Mater. 24, 2238 (2012). (d) T. Sakamoto et al., Adv. Sci. 5, 1700405(2018). (e) K. Hamaguchi et al., ACS Macro Lett. 8, 24 (2019). (f) M.
Gupta et al., ACS Macro Lett. 8, 1303 (2019).
[2] R. Watanabe, T Sakamoto, K. Yamazoe, J. Miyawaki, T. Kato, and
Y. Harada, Angew. Chem. Int. Ed. 59, 23461 (2020).
[3] T. Fransson et al., Chem. Rev. 116, 7551 (2016).
[4] Y. Harada et al., Rev. Sci. Instrum. 83, 013116 (2012).
Authors
R. Watanabea, T Sakamotoa, K. Yamazoe, J. Miyawaki, T. Katoa, and Y.
HaradaISSP Activity Report 2020

55

Progress of Facilities
Supercomputer Center
The Supercomputer Center (SCC) is a part of theMaterials Design and Characterization Laboratory (MDCL)of ISSP. Its mission is to serve the whole community ofcomputational condensed-matter physics of Japan, providing
it with high performance computing environment. In particular, the SCC selectively promotes and supports large-scalecomputations. For this purpose, the SCC invites proposals
for supercomputer-aided research projects and hosts theSteering Committee, as mentioned below, that evaluates the
proposals.
The ISSP supercomputer system consists of two subsystems: System B, which was replaced recently (Oct. 2020), isintended for larger total computational power and has morenodes with relatively loose connections whereas System C
is intended for higher communication speed among nodes.
System B (ohtaka) consists of 1680 CPU nodes of Dell
PowerEdge C6525 and 8 FAT nodes of Dell PowerEdge
R940 with total theoretical performance of 6.881 PFLOPS.
System C (enaga) consists of 252 nodes of HPE SGI 8600
with 0.77 PFLOPS. Replacement of the System C is scheduled in April 2022.
In addition to the hardware administration, the SCC
puts increasing effort on the software support. Since 2015,
the SCC has been conducting “Project for advancement ofsoftware usability in materials science (PASUMS)”. In thisproject, for enhancing the usability of the ISSP supercomputer system, we conduct several software-advancement
activities: developing new application software that runs
efficiently on the ISSP supercomputer system, adding new
functions to existing codes, help releasing private codesfor public use, creating/improving manuals for public
codes, etc. Three target programs were selected in fiscal
year 2020: (1) PHYSBO (proposal made by R. Tamura(NIMS)), (2) 2DMAT (proposal made by T. Hoshi (Tottori
Univ.)), and (3) MateriApps Installer (proposal made by
S. Todo (Univ. of Tokyo)). In 2021, we also started the datarepository service.
All staff members of university faculties or publicresearch institutes in Japan are invited to propose research
projects (called User Program). The proposals are evaluatedby the Steering Committee of SCC. Pre-reviewing is doneby the Supercomputer Project Advisory Committee. In fiscal
year 2020, totally 387 projects were approved including theones under the framework of Supercomputing Consortiumfor Computational Materials Science (SCCMS), which
specially supports FUGAKU and other major projects incomputational materials science. The total points applied andapproved are listed on Table. 1 below.
The research projects are roughly classified into thefollowing three (the number of projects approved, notincluding SCCMS):First-Principles Calculation of Materials Properties (189)Strongly Correlated Quantum Systems (40)
Cooperative Phenomena in Complex, Macroscopic
Systems (137)In all the three categories, most proposals involve bothmethodology and applications. The results of the projects arereported in 'Activity Report 2020' of the SCC. Every year 3-4
projects are selected for “invited papers” and published at
the beginning of the Activity Report. In the Activity Report
2020, the following three invited papers are included:1.
2.

“High precision study of the Anderson transition”,
Tomi OHTSUKI (Sophia U.) and Keith SLEVIN(Osaka U.)“Some Recent Developments in ab initio Thermodynamics of Ion Disorder in Solids”, Shusuke
KASAMATSU (Yamagata U.)

First semester (Apr.-Sep.)Class

Max Points

Application

System System
B
C

Numberof
Projects

Second semester (Oct.-Mar.)
Total Points

AppliedApproved

SystemB

SystemC

Class

SystemB

SystemC

Max Points

Application

System System
B
C

Numberof
Projects

Total Points
AppliedApproved

SystemB

SystemC

SystemB

System
C

A

100

50

any time

8

0.8k

0.4k

0.8k

0.4k

A

100

50

any time

10

1.0k

0.4k

1.0k

0.4k

B

500

100

twice a year

61

28.4k

4.0k

22.8k

3.9k

B

1k

100

twice a year

57

46.6k

3.2k

22.0k

2.0k

C

5k

1k

twice a year

115

446.5k80.1k239.8k

42.4k

C

8k

1k

twice a year

96595.8k

59.0k

226.0k

22.3k

D

10k

1k

any time

3

22.5k

2.0k

15.0k

2.0k

D

10k

1k

any time

0

0k

0k

0k

0k

E

15k

3k

twice a year9

127.4k

27.0k

88.5k

21.4k

E

25k

3k

twice a year7

175.0k

18.0k

87.0k

8.4k

S

–

–

twice a year

0

0

0

0

0

S

–

–

twice a year

0

0

0

0

0

SCCMS

11

23.7k

4.6k

23.7k

4.6k

SCCMS

10

50.0k

4.5k

50.0k

4.5k

Total

207

649.3k

118.0k

390.6k

74.6k

Total

180

868.3k

85.0k

386.0k

37.5k

Table 1. Research projects approved in 2020
The maximum points allotted to the project of each class are the sum of the points for the two systems. Computation of one node for 24 hours
corresponds to one point for the CPU nodes of System B and System C. The FAT nodes require four points for a 1-node 24-hours use.

56

ISSP Activity Report 2020

3.

“Large-Scale Molecular Dynamics Simulations ofKarman Vortex and Sound Wave: Cavitation andPolymer Effects”, Yuta ASANO (ISSP), Hiroshi
WATANABE(Keio Univ.) and Hiroshi NOGUCHI(ISSP)

Neutron Science Laboratory
The Neutron Science Laboratory (NSL) has been playing
a central role in neutron scattering activities in Japan since
1961 by performing its own research programs as well as
providing a strong General User Program (GUP) for theuniversity-owned various neutron scattering spectrometers
installed at the JRR-3 (20 MW) operated by Japan Atomic
Energy Agency (JAEA) in Tokai, Ibaraki (Fig. 1). In 2003,
the Neutron Scattering Laboratory was reorganized as the
Neutron Science Labora­tory to further promote the neutronscience with use of the instruments in JRR-3. Under GUP
supported by NSL, 12 university-group-owned spectrom­eters in the JRR-3 reactor are available for a wide scope of
researches on material science. The submitted proposals
were about 300 and the visiting users reached over 6000
person-day in FY2010. In 2009, NSL and Neutron Science
Division (KENS), High Energy Accelerator Research
Organization (KEK) built a chopper spectrometer, High
Resolution Chopper Spectrometer, HRC, at the beamline BL12 of MLF/J-PARC (Materials and Life Science
Experimental Facility, J-PARC) (Fig. 2). HRC covers wide
energy transfer (100 μeV < ħω < 0.5 eV) and momentum
transfer (0.03 Å-1 < Q < 30 Å-1) ranges, and therefore
becomes comple­mentary to the existing inelastic spectrometers at JRR-3. HRC has accepted general users through the
J-PARC proposal system since FY2011.
Triple axis spectrometers, HRC, a four-circle diffractometer, and a high resolu­
tion powder diffractometer are
utilized for a conventional solid state physics and a varietyof research fields on hard-condensed matter, while in thefield of soft-condensed matter science, researches aremostly carried out by using a small angle neutron scattering(SANS-U) and/or neutron spin echo (iNSE) instruments. The
upgraded time-of-flight (TOF) inelastic scattering spectrometer, AGNES, is available both for hard- and soft-matterscience. Our GUP has produced 2068 publications and 285
dissertations until April 30, 2021. Their lists for the last 10
years are given in Activity Report on Neutron Scattering
Research which is available in ISSP and NSL web pages.

Fig. 2. Schematic view of HRC.

Since the Great East Japan Earthquake on March 11,
2011, JRR-3 had been closed mainly from safety issues.
Hence, our domestic activity was only on HRC. To takeup a recent research highlight, well-defined spin wave was
successfully measured in the pressure-induced magneticphase in CsFeCl3 [1]. Collaboration between HRC and
CTAX, which is mentioned below, has clarified the hybridization of phase and amplitude modes near a quantum
critical point [2]. Another progress on HRC was that asuperconducting magnet up to 5 T became available. Field
dependence of spin-wave spectra in 2D antiferromagnet
Ba2MnGe2O7 was measured. From FY2012 to FY2020,
NSL has managed User-Program Supports for Overseas
Experiments. 398 people (for 297 proposals) have performed
their experiments in various foreign facilities and published
114 papers. The lists for this program are also available in
Activity Report on Neutron Scattering Research mentioned
above.
As for international cooperative programs, NSL operates
the U.S.-Japan Coopera­tive Program on neutron scattering,
providing further research opportunities to material scientists
who utilize the neutron scattering technique for their researchinterests. In 2010, relocation of the U.S.-Japan triple-axis
spectrom­eter, CTAX, was completed, and it is now open tousers. NSL has another agreement with Australian Centre for
Neutron Scattering (ANSTO), which was the main foreign
facility for the User-Program Supports for Overseas Experiments.
It is really good news that JRR-3 has restarted in
February 2021 after long shutdown and the normal GUP
will come back from July 2021. During the shutdown
period, we had been concentrating our efforts on upgrading
the instruments and neutron beam circumstances. Specificactions taken include: the installation of focusing collimation systems, such as focusing monochromator and focusing
analyzer, and material lens; and the introduction of polarization optics together with the installation of non-magnetization neutron shield. The neutron guides in the Guide Hall
have also been upgraded by replacing the existing ones
with super-mirror guides. These upgrades should result inincrease in neutron beam flux several times. The sample
environments such as cryostat and pressure cells have also
been upgraded. We are looking forward to restarting science
activities in JRR-3.
[1] S. Hayashida et al., Phys. Rev. B 97, 140405(R) (2018).
[2] S. Hayashida et al., Sci. Adv. 5, eaaw5639 (2019).

Fig. 1. Reactor hall of JRR-3. Three triple axis spectrometers are shownin the photo.

ISSP Activity Report 202057

International MegaGauss
Science Laboratory
The objective of this laboratory (Fig. 1) is to study thephysical properties of solid-state materials (such as metals,
semiconductors, insulators, superconductors, and magnetic
materials) in a high magnetic field of 100 T or even higher.
Such a high magnetic field can control material phases andfunctions. Our pulsed magnets, at moment, can generate up
to 87 Tesla (T) by non-destructive manner, and up to 1200
T by destructive manner. The world record indoor magnetic
field 1200 T was achieved in 2018. The laboratory is open
for scientists in domestic as well as from overseas. Lots offruitful results have come out not only from the collaborative
researches but also from our in-house activities.

Fig. 1. The building C of the IMGSL.

Building C
Room
101-113

Bmax

Type

ElectroMagnetic
Flux Compression

Destructive

Horizontal
Single-turn Coil

Destructive

300 T
200 T

10 mm
6μs
5 mm
10 mm

VerticalSingle-turn Coil

Destructive

300 T
200 T

8μs
5 mm
10 mm

1200 T

60 T
Building C
Room
114-120

Building C
Room 121

Pulse width
Bore

Alias

3μs

(100-1200T)

Power source

Applications

Others

5 MJ, 50 kV
2 MJ, 50 kV

Magneto-Optical
Magnetization

5 K – room
temperature

0.2 MJ, 50 kV

Magneto-Opticalmeasurements
Magnetization

5 K – room
temperature

0.2 MJ, 40 kV

Magneto-Optical
Magnetization

2 K – room
temperature

0.9 MJ, 10 kV

Magneto-Optical measurements
Magnetization
Magneto-Transport
Hall resistance
Polarization
Magneto-Striction
Magneto-Imaging
TorqueMagneto- Calorimetry
Heat Capacity

40 ms
18 mm

Mid-pulse Magnet Non-destructive
70 T

Our interests cover the study on quantum phase transitions (QPT) induced by high magnetic fields. Field-induced
QPT has been explored in various materials such as quantum
spin systems, strongly correlated electron systems and othermagnetic materials. One of our ultimate goals is to provide
the joint-research users with a 100 T millisecond-long pulse
using a non-destructive magnet, and to offer versatile highprecision physical measurements. Measurable physicalquantities or properties are magneto-optical spectra, magnetization, magnetostriction, electrical transport, specific heat,
nuclear magnetic resonance, and ultrasound propagation.
They can be carried out with sufficiently high accuracy.
Another ultimate goal is to extend the magnetic field region
and discover novel phenomena happening only in extremely
strong magnetic fields exceeding 100 T. Recent technicaldevelopments allow us to even measure magnetostriction
and ultrasound propagation in the destructive magnetic
fields over 100 T, that can directly reach potential structuralchanges in the ultrahigh magnetic fields. Recent discovery ofmagnetic field induced insulator-metal transitions of strongly
correlated materials in 500 T would open new direction of
the megagauss field research, namely exploration of fieldinduced novel phases in materials with strong interactions
comparable to thermal energy of a room temperature.
A 210 MJ flywheel generator (Fig. 2), which is the world
largest DC power supply (recorded in the Guinness Book ofWorld Records) was installed in the DC flywheel generator
station at our laboratory, and used as an energy source ofsuper-long pulse magnets. The magnet technologies areintensively devoted to the quasi-steady long pulse magnet

40 ms
10 mm

PPMS

Steady14 T

ResistanceHeat Capacity

MPMS

Steady7T

Magnetization

87 T(2-stage pulse)

5 ms
10 mm

Short-Pulse Magnet Non-destructive
Building K
Long-Pulse Magnet Non-destructive

85 T

5 ms
18 mm

43.5 T

1s
30 mm

ISSP Activity Report 2020

Lowest temperature
0.1 K

Down to 0.3 K

0.5 MJ, 20 kV

Magnetization
Magneto-Transport

2 K – room
temperature

210 MJ, 2.7 kVResistance
Magneto-Calorimetry

2 K – room
temperature

Table 1. Available Pulse Magnets, Specifications

58

Independent
Experiment in 5 site

Fig. 4. Schematic picture of the V-type single-turn coil equipped witha 40 kV, 200 kJ fast capacitor bank system. The liquid-helium-bathcryostat with a plastic tail is also shown.

Fig. 2. Upper: The K-building for the flywheel generator (left handside) and a long pulse magnet station (right hand side). Lower: The
flywheel giant DC generator which is 350 ton in weight and 5 m high(bottom). The generator, capable of a 51 MW output power with the
210 MJ energy storage, is planned to energize the long pulse magnet
generating 100 T without destruction.

(an order of 1-10 sec) energized by the giant DC power
supply. The giant DC power source will also be used for the
giant outer-magnet coil to realize a 100 T nondestructive
magnet by inserting a conventional pulse magnet coil in its
center bore. Recently, the super-long pulsed magnet has been
intensively used to investigate thermal properties such as
specific heat and magnetocaloric effects.
Magnetic fields exceeding 100 T can be obtained with
only destruction of a magnet coil. The ultrahigh magnetic
fields are obtained in a microsecond time scale. The project,financed by the ministry of education, culture, sports,science and technology aiming to generate 1000 T withthe electromagnetic flux compression (EMFC) system(Fig. 3), has been completed. Our experimental techniques
using the destructive magnetic fields have intensively beendeveloped. The system which is unique to ISSP in theworld scale is comprised of a power source of 5 MJ maincondenser bank and 2 MJ condenser bank. Two magnet
stations are constructed and both are energized from eachpower source. Both systems are fed with another 2 MJ
condenser bank used for a seed-field coil of which magnetic
flux is to be compressed. The 2 MJ EMFC system cangenerate 450 T. The 5 MJ system is used for generation ofFig. 3. A view of the coil setup of the electromagnetic flux compression
inside of an anti-explosive house. The world strongest indoor magnetic
field 1200 T was achieved in 2018.

1000 T-class magnetic field. For the research in magnetic
field range of 100 - 300 T, we have two single-turn coil
(STC) systems that have a fast-capacitor bank system of
200 kJ for each. One is the horizontal type (H-type) and theother is a vertical type (V-type, Fig. 4). Various kinds of laser
spectroscopy experiments such as the cyclotron resonanceand the Faraday rotation are possible using the H-type STC,
while a stable low temperature condition of 2 K is available
for the V-type STC.

Center of Computational
Materials Science
With the advancement of hardware and software technologies, large-scale numerical calculations have been making
important contributions to materials science and will haveeven greater impact on the field in the near future. CCMS
is a specialized research center established in 2011 forpromoting computer-aided materials science with massively
parallel computers, such as the Fugaku supercomputer,which has been recently developed in Kobe as the coreof a billion-dollar national project. Activities of CCMS
are divided into the following three categories: (1) highly
efficient and large-scale use of the Fugaku supercomputerand its application to grand-challenge problems in computational materials science, (2) activities as the center for thecommunity of computational condensed matter physics andmaterials science, and (3) computational physics researchaiming to solve rare-element problems.

Fig. 1. Group photo in the CDMSI symposium

ISSP Activity Report 202059

For the first category, each group in CCMS is carryingout various individual research projects in its own expertise to efficiently utilize large-scale parallel computers. For
example, the Ozaki group has been developing efficientand accurate methods and software packages to extend theapplicability of DFT to more realistic systems, and investigated the structural and electronic properties of various
2D materials in successful collaboration with experimentalgroups and industrial companies. There are other activities
such as development of Tensor Network (TN) based numerical methods and Markov-chain Monte Carlo methods by the
Kawashima group and the Todo group.
As for the activities in the second category, apartfrom major annual conferences and formal international
meetings as shown in Fig. 1, the CCMS/CDMSI hosted, andalso provided a series of lectures and training sessions at
Kashiwa. For example, training sessions "Kashiwa HandsOn" for getting accustomed to various application programs,
such as OpenMX, HΦ, mVMC, AkaiKKR, and MateriApps
LIVE!, as shown in Fig. 2, have been held monthly. Eachsession is designed for 5-10 trainees and takes 4-5 hours. We
also coordinate the use of the computational resources available to our community, and support community members
through various activities such as administrating the website"MateriApps" for information on application software incomputational science as shown in Fig. 3.
For the third category, the Akai team and the Fukushimagroup are working on the development of new permanent
magnet materials. In order to meet the ever-increasing
demands for new permanent magnet materials that are used
for high performance permanent magnets, CCMS is theoretically investigating the various magnetic properties, such as
saturation magnetization, Curie temperature, and magnetic

anisotropy, of iron-based magnetic materials, including rareearth magnet materials, R2(Fe,Co)14B, R2(Fe,Co)17, andRFe11.5Ti0.5 (R = La, Ce, … , Lu, Y) on the basis of firstprinciples calculations.
These activities are supported by funds for various
governmental projects including Element Strategy Initiative
and the Program for Promoting Researches on the Supercomputer Fugaku.
The following is the selected list of meetings organized
by CCMS in recent years:• 2019/10/8-2019/10/10 The 3rd Innovation Camp
for Computational Materials Science (3rd ICCMS),Takinoyu Hotel, Yamagata.
• 2019/12/6 TIA-Kakehashi Poster Workshop 2019 The
University of Tokyo Kashiwa Campus Station Satellite,
Kashiwa• 2019/12/13 Element Strategy Initiative Advisory
Council (ESIAC) 2019, TKP Garden city, Yokohama.
• 2020/2/3-2020/2/4 4th Element Strategy Symposium:
New Developments in Industry-Academia Research
Collaboration, Ito Hall, Tokyo.
• 2020/2/25 PCoMS Skill improvement training for
graduate students & postdocs ISSP, Kashiwa.
• 2020/6/19∙2020/6/23 Matching Workshop for industries& graduate students/ postdocs, Online.
• 2020/12/21-2020/12/22 Joint Research Meeting of ISSP
Supercomputer Joint Use and CCMS Annual Activity
Report 2020, Online.
In addition to the events listed above, we organize regularhands-on program for various application, such as Open MX
and HΦ.

Laser and Synchrotron Research Center(LASOR Center)Fig. 2. Software in the CCMS community

Fig. 3. MateriApps Website

60

ISSP Activity Report 2020

Laser and synchrotron research center (LASOR Center)
was established in October 2012 to push the frontiers of
the photon and materials science. LASOR has 10 groups
in 2019, which is the biggest division in ISSP. Most of theresearch activities on the development of new lasers with anextreme performance and the application to materials science
are studied in specially designed buildings D and E withlarge clean rooms and the isolated floor from the vibrationsin Kashiwa Campus. On the other hand, the experiments
utilizing the synchrotron radiation are performed at beamline
BL07LSU in SPring-8 (Hyogo).

Fig. 1. Optical frequency comb

Fig. 2. Close look of a high-peak-power ultrashort-pulse laser

Fig. 4. Phase-dependence of high harmonic spectra in soft X rays.

The development of novel laser-based light sources in thevacuum-ultraviolet to soft-X-ray regions innovated materials
investigations as represented by the highest-energyresolution photoemission, ultrafast time-domain, and ultrafast non-linear spectroscopies. Materials science research
powered by lasers thus has entered a new era. The ultra-shortand high-power lasers are more and more attractive lightsource for both basic science and industry. The state-of-theart laser source and spectroscopy are intensively explored.
Another stream pursued at ISSP is the synchrotron-based
research. The drastic advance in brilliance of the synchrotron
radiation has also opened a new field of its own in photon
science. The soft-X-ray beam-line in SPring-8 (BL07LSU)
was implemented with the longest undulator in the world:
The end stations illuminated by the brilliant soft-X-rays
are used to output innovative achievements based on highresolution spectroscopy data. In 2018, Japanese government
has made a statement to construct a new synchrotron facilityin Tohoku. LASOR has decided to subjectively contribute tothis facility from the design to the operation.
Lasers and synchrotrons have developed independently;
now both light sources cover a wide photon-energy range
with an overlap in the vacuum-ultraviolet to soft-X-ray
regions. Foreseeing their common interests in research fields
and technologies, ISSP integrated the two streams, namely
the extreme lasers and synchrotron radiations, into thecommon platform. Through the mutual interactions between
the forefronts of lasers and synchrotrons, LASOR will be
the center of innovations in light and materials science, withthe aid of world-wide joint research and close collaborations
with other divisions in ISSP such as New Materials Science,
Nanoscale Science, and Condensed Matter Theory.

Fig. 3. Design of E building for extreme VUV- and SX-lasers and newspectroscopy.

Fig. 5. 10-MHz high harmonic generation in an enhancement cavity.

The mission of LASOR is to cultivate and propel thefollowing three scientific fields:
1. Laser Science,
2. Synchrotron radiation Science,
3. Extreme Spectroscopy,• Laser science group
We were committed to continuing to developed various
state-of-the-art laser systems such as high-power solid-stateor gas lasers, high-intensity lasers, ultra-short pulse lasers
down to attosecond time scale (Peta Hz linewidth), ultrastable lasers with 1-Hz linewidth, optical frequency combs,
mid-infrared lasers, THz light source, and semiconductor
lasers.
High-power and ultrashort pulse laser technology has
progressed for this 10 years. It opened two directions ofresearch. One is a coherent extreme ultraviolet light source
realized by a high-harmonic generation (HHG) scheme. The
average power of HHG became high enough to use it for a
photoemission spectroscopy. The photon energies of 7 eV
to 60 eV are now available. They can be either very narrow
band width or ultrashort pulse. The other is an industrial
science such as a laser processing. Pulse duration variable,
100-W average power, femtosecond laser is now available in
LASOR for any collaborative research including companies.

ISSP Activity Report 202061

Fig. 6. Pump-probe photoemission system using 60-eV laser

We also aim to develop novel laser spectroscopy andcoherent non-linear optical physics, enabled via emerging
lasers and optical science/technology, and extensively study
basic light-matter physics, optical materials science, andapplied photonics. Such researches include ultrafast spectroscopy for excited state dynamics, terahertz magnetic-field
spectroscopy for spin dynamics, quantitative micro-spectroscopy on semiconductor lasers and nano-structure photonics
devices, such as quantum wire lasers, gain-switch semiconductor laser, multi-junction solar cells, and bio-luminescentsystems.
• Synchrotron radiation science group
By inheriting and developing the synchrotron techniques
cultivated for more than 20 years, we continuously develop
world cutting-edge spectroscopies such as time-resolved
photoemission/diffraction, ultrahigh resolution soft X-ray
emission, 3D (depth + 2D microscopy) nano ESCA and
X-ray magneto-optical effect and provide these techniques
both for basic material science and for applied science,
which contributes to the device applications in collaboration
with outside researchers. In order to pioneer new spectroscopies for the next-generation light sources, we upgrade
fast polarization switching of the undulator light source incooperation with SPring-8. In addition, we promote frontier
works on the use of X-ray free electron lasers, SACLA withhigh spatial and temporal coherence comparable to opticallasers in collaboration with scientists of laser light sources
and spectroscopies.

Fig. 7. Photonics devices under study: (left panel) semiconductor
quantum wires and (right panel) firefly-bioluminescence system
consisting of light emitter (oxyluciferin) and enzyme (luciferase)

62

ISSP Activity Report 2020

• Extreme spectroscopy group
The advent of laser-based light sources in the soft-X-ray
region is opening a new stage in the field that has been cultivated by the synchrotron radiations. One of the milestones
is to develop a laser-based light source of ~7 eV for the
sub-meV-resolution photoemission spectroscopy. In thisfive years, available photon energy became 11 eV with helpof Yb-fiber laser technology. It has high photon flux (1014photons/sec) with sub picosecond time resolution. Laserbased spin-resolved ARPES was realized in LASOR. This
technology would open brand-new spectroscopy. Highharmonic generation based photoemission spectroscopy
in the 20-60 eV region is another direction to be pursued.
Time-domain spectroscopy in the femtosecond region wasachieved. Combined with the picosecond time-domain
spectroscopy utilizing the pulsed light delivered fromsynchrotrons, we investigate the electronic structures anddynamics of matter in bulk, on surface, and into the nanoscale. The ultimate objective is to expand the soft-X-ray
operando methodologies by lasers. Diffractions, magnetooptical effects, and inelastic scatterings now done at synchrotrons will be performed by lasers, to access the real-time
dynamics of chemical reactions and phase transitions down
to the femtoseconds.
State-of-the-art laser based organism spectroscopy is a
new direction in LASOR. ISSP research area is shifting from
simple material and science to complex one including living
body and functional material with excited state physics.

Synchrotron Radiation Laboratory
The Synchrotron Radiation Laboratory (SRL) was established in 1975 as a research division dedicated to solid statephysics using synchrotron radiation (SR). Currently, SRL is
composed of two research sites, the Harima branch and theE-building of the Institute for Solid State Physics.
• Brilliant soft X-ray beamline at Harima branch
In 2006, the SRL staffs have joined the Materials
Research Division of the Synchrotron Radiation Research
Organization (SRRO) of the University of Tokyo and they
have played an essential role in constructing a new highbrilliant soft X-ray beamline, BL07LSU, in SPring-8. The

Fig. 1. Ambient pressure photoemission

Fig. 2. 3D nano-ESCA stationcontrolled 25-m long soft X-ray undulator. In 2020, 24 usergroups made their experiments during the SPring-8 operation
time. The number is slightly decreased compared with theusual annual operation because of the COVID-19 problem.
The official beamtime was cut off in April and May andreplaced by the beamtime in the latter half of 2020.
• High-resolution Laser SARPES at E-building

Fig. 3. Soft X-ray emission station

light source is the polarization-controlled 25-m long soft
X-ray undulator with electromagnetic phase shifters thatallow fast switching of the circularly (left, right) and linearly(vertical, horizontal) polarized photons.
The monochromator is equipped with a varied linespacing plain grating, which covers the photon energy range
from 250 eV to 2 keV. At the downstream of the beamline, a
lot of experimental stations have been developed for frontier
spectroscopy researches: three endstations, i.e. ambientpressure photoemission (Fig. 1), three-dimensional (3D)
nano-ESCA (Fig. 2), high resolution soft X-ray emission
spectroscopy (XES) (Fig. 3) stations are regularly maintainedby the SRL staffs and open for public use, and at free-port
station many novel spectroscopic tools have been developedand installed such as soft X-ray resonant magneto-optical
Kerr effect (XMOKE) and so on. The beamline construction was completed in 2009 and SRL established the Harimabranch laboratory in SPring-8. At SPring-8 BL07LSU, each
end-station has achieved high performance:the time-resolved
soft X-ray spectroscopy (TR-SX) station equipped with a
two-dimensional angle-resolved time-of-flight (ARTOF)
analyzer has established the laser-pump and SR-probe
method with the time-resolution of 50 ps which corresponds to the SR pulse-width. This apparatus was moved
to E-building in the 2020 summer to realize better temporal
resolution using the fsec high harmonic laser pulse of
11 eV; the 3D nano-ESCA station reaches the spatial resolution of 70 nm; the XES station provides spectra with theenergy resolution around 70 meV at 400 eV and enables
real ambient pressure experiments. Soft X-ray resonant
MOKE station has been developed to make novel magnetooptical experiment using fast-switching of the polarization-

High-resolution Laser Spin- and Angle-Resolved Photoemission Spectroscopy (SARPES) is a powerful technique
to investigate the spin-dependent electronic states in solids.
In FY2014, LASOR and SRL staffs constructed a new
SARPES apparatus (Fig. 4), which was designed to provide
high-energy and -angular resolutions and high efficiency ofspin detection using a laser light at E-building. The achievedenergy resolution of 1.7 meV in SARPES spectra is thehighest in the world at present. From FY2015, the new
SARPES system has been opened to outside users.
The Laser-SARPES system consists of an analysis
chamber, a carousel chamber connected to a load-lockchamber, and a molecular beam epitaxy chamber, which
are kept ultra-high vacuum (UHV) environment and areconnected to UHV gate valves. The electrons are excitedwith 6.994-eV photons, yielded by 6th harmonic of a
Nd:YVO4 quasi-continuous wave laser with a repetition
rate of 120 MHz, and 10.7 eV photons, driven by the third
harmonic radiation at 347 nm of an Yb:fiber chirped pulse
amplifier laser, which was developed by Kobayashi's lab in
LASOR. The hemispherical electron analyzer is a custommade Scienta Omicron DA30-L, modified for installing thespin detectors. The spectrometer is equipped with two highefficient spin detectors associating very low energy electron
diffraction are orthogonally placed each other, which allows
us to analyze the three-dimensional spin polarization ofelectrons. At the exit of the hemispherical analyzer, a multichannel plate and a CCD camera are also installed, whichenables us to perform the angle-resolved photoelectron
spectroscopy with two-dimensional (energy-momentum)
detection. The laser-SARPES with 7-eV laser can provide
both high-resolution spin-integrated and spin-resolved photoemission spectra in various types of solids, such as spin-orbit
coupled materials and ferromagnetic materials. In addition,using the 10.7-eV makes it possible to follow their ultrafast
spin dynamics in the time domain by pump-probe scheme.

Fig. 4. Laser-SARPES system at E-building

ISSP Activity Report 202063

Conferences and Workshops
Frontiers of Quantum Computational Science

July 9-10, 2020

H. Shinaoka, T. Okubo, J. Otsuki, N. Kawashima, S. Todo, T. Misawa, and S. Morita

Various numerical methods such as dynamical mean-field approximation, variational Monte Carlo, and tensor network
methods have been developed for solving quantum many-body problems. In addition, there are many attempts to quantitatively
predict the properties of strongly correlated materials by integrating these elaborate many-body methods and first-principles
methods. In recent years, new approaches using machine learning, quantum computers, and quantum chemical methods
have emerged for solving many-body problems. There is a need for an opportunity for researchers in different fields to meet,exchange information, and have extensive discussions. The Institute of Solid State Physics has been playing an essential role asa center for computational condensed matter physics. Thus, it is of great significance for the future development of computational condensed matter physics to hold a short-term workshop with experts in these different fields.
In line with the workshop
theme, we invited young
researchers in quantum computing,machine learning, information
theory, and in first-principles andmodel calculations on quantum
many-body systems. The final
program consisted of 20 oral talks(including 11 invited talks) and
15 poster talks. The number ofregistered participants was 180,and more than 150 attended bothdays, with a maximum of 120
simultaneous participants in realtime. Although the workshop washeld online using Webex and Slackdue to the COVID-19 pandemic,
there were extensive discussions
between participants in oral andposter talks.

Present Status of Neutron Scattering Research and the Future Prospect
after the Restart of JRR-3

July 27-29, 2020
T. Masuda, T. Nakajima, O. Yamamuro, M. Fujita, T. Sato, T. Osakabe, M. Sugiyama, and M. Hino

Neutron Science Laboratory (NSL) operates collaboration research using research reactor JRR-3 and has been leading
neutron scattering science. JRR-3, however, has suspended its operation since the Great East Japan Earthquake in 2011. Owing
to the strong and patient demand from the neutron science community, JRR-3 has finally restarted in February 2021 after thelong aseismic reinforcing work. In prior to the restart, NSL held the ISSP regular workshop for the neutron users to discuss
the frontier of the research related to neutron science, for the instrumental scientists to propose possible research plan after therestart, and for both to discuss new institution of collaboration research constructed under the latest safety standard. Because of
the COVID19 the workshop was held using ZOOM, and 115 scientists including those from abroad participated. 15 presentations on solid state physics and 15 presentations on material science and soft matter were made followed by active discussions.
5 presentation on the new institution of the collaboration research were made on the last day. NSL director Yamamuro proposed
the revised plan of Instrumentation and Research Team for the update and maintenance of spectrometers and the promotion of
the science for the instrumental scientists as well as the revised proposal format of the general user program meeting the latest
safety standard. In spite of the first ZOOM workshop for NSL it finished a success.

64

ISSP Activity Report 2020

Recent Developments and Future Prospects of Quantum Materials Research
September 24, 28, 29, 2020
Y. Otani, M. Yamashita, and Z. Hiroi
Condensed matter physics has evolved significantly through the discovery of new substances, phenomena and concepts.
Especially in the strongly correlated electron system field where simple one-particle approximation breaks down, close cooperation of synthesis, measurement, and theory, which bear these three elements, is important. In recent years, quantum materials
that have developed strongly correlated electron systems have been attracting attention, and the Institute for Solid State
Physics, University of Tokyo has established a quantum materials research group with the aim of breaking through researchthrough the fusion of fields. Furthermore, the experimental group of the Material Design and Characterization Laboratory,
which has been responsible for material development, and the Research Division of the Condensed Matter Physics, which has
been mainly responsible for measurement, are strongly collaborating with the Quantum Materials Research Group to develop
active research.
Based on the above situation, this ISSP workshop focused on material development in quantum materials research andexperimental research using various measurement methods, and aimed to give an overview of the current state of recent
research and discuss future research prospects. The event was co-sponsored by the Quantum Materials Research Group, theResearch Division of the Condensed Matter Physics, and the Material Design and Characterization Laboratory.

The workshop was held in the morning of three days in the form of presentation at Zoom, and a total of 18
researchers gave lectures in the program. Pre-registration reached 171 people, with 120-130 participants daily
throughout the three days. The speakers introduced recent research on quantum materials and expressed theiropinions on future prospects, and there were many questions and comments from the participants, and lively
discussions took place. Although it was held in an unusual format using Zoom, it was as meaningful an opportunity
as the conventional workshop. It was also an opportunity to think about the future of the research at the Institutefor Solid State Physics.

Computational Materials Science —New Perspectives2020—

December 21- 22, 2020
O. Sugino, T. Ozaki, N. Kawashima, H. Noguchi, T. Fukushima,
Y. Higuchi, S. Morita, J. Haruyama, M. Kawamura, M. Fukuda, and K. Ido

This workshop was organized for the computational condensed matter research community, especially for the users of the
ISSP supercomputers, to exchange the most recent information on the computational condensed matter research and on thehigh-performance computation of related research areas. This was held as a series of annual workshop of ISSP supercomputer that has been held every year. However, the workshop has been postponed from April to December due to the state of
emergency caused by COVID-19 and has been held at ONLINE. The registered people were 135. The selected topics include
the target of the Fugaku supercomputer project, the emergent data-driven material research, and “Project for advancement ofsoftware usability in materials science (PASUMS)” that developed the ab-Initio Configuration Sampling tool kit (abICS) tosolve the replica exchange Monte Carlo (RXMC) sampling coupled directly with local structural relaxation and energy calculation using DFT codes in 2019. In addition to 19 invited talks, 26 poster presentations, and a special lecture for data-repository
were given by Prof. Miho Funamori. In the poster presentation, short talk presentations and discussions using an online bulletinboard and zoom break-out room have been set. The posters were evaluated byinvited speakers and the organizers; three posters were selected and given theposter award.

ISSP Activity Report 2020

65

Present and Future of Data Science in Condensed Matter Physics

February 22 and 24, 2021
K. Yoshimi, T. Ozaki, O. Sugino, H. Noguchi, T. Fukushima, K. Ido, M. Fukuda, R. Tamura, and N. Kawashima

Recently, researchers are becoming more enthusiastic in application of data-scientific methods to condensed matter physics,
with the hope for developing a new scheme for numerical simulation, improvement of quality of theoretical predictions, andacceleration in search and development of new materials. From these activities, problems arise concerning how we manage
ever-increasing data and make them more usable in the new schemes. We intended this workshop to be an opportunity for theparticipants to share experience in application of data-scientific methods to condensed matter physics and biochemistry, as
well as data-base construction and its maintenance. We had 209 registrations and recorded 150 maximam simaltaneous participants on the first day and 120 for the second. The first day was dedicated to the application of machine learning in physics andbiochemistry whereas the second day was for data-repositories and data-bases. Concerning application of the machine learning,
Sugino (ISSP) gave a presentation on machine learning for basic aspects of the theoretical condensed matter physics, i.e., thenumerical estimation of the Kohn-Sham exchange-correlation potential. Ozaki (ISSP), Fukushima (ISSP) and Chikyo (NIMS)
presented their works on the comprehensive high-throughput calculation and/or construction of material data-bases. Terayama(Yokohama City U.) discussed the 3D structural study of protein molecules aided by the machine learning, and Inoue (ISSP)
talked about function prediction of amino-acid sequences. As for data-repositories and data-bases, Katsura (NIMS) talked
about the construction of the data-base from the graphic information of research papers, and its applications. Taura (U Tokyo)
presented the current state of the starting project on "mdx". Kobayashi(ISSP)'s talk was about lasor manifacturing as a potential
target of data-accumulation and machine-learning. Miyake (AIST) presented their recent result on the data assimilation method
based on both numerical and experimental data in search of new magnetic materials. Upon these results, we also held a panel
discussion to further discuss what new framework is to be created for the data management and how we should proceed in its
applications, with panellers being Kobayashi (ISSP), Tamura (U Tokyo and NIMS), Katsura (NIMS) and Shoji (TOYOTA) andthe mediator Yoshimi (ISSP).

Core Technology Toward the Frontier Soft X-Ray Science

March 4, 2021
T. Kimura, T. Arima, F. Komori, Y. Harada, I. Matsuda, H. Mimura, and T Kondo

The workshop was organized on March 4 by the Institute for Solid State Physics (ISSP) and Synchrotron Radiation Research Organization of the University of Tokyo (UTokyo-SRRO) and User Community VUV-SX High-Brilliance Light Sources. The workshop was held
online using ZOOM, and about 140 participants from a wide range of fields, including universities, companies and research institutes,
attended. In this workshop, eight researchers were invited to give talks on the latest trends in soft X-ray science and to discuss the new direction that will emerge from the next-generation synchrotron radiation facility in Sendai. The next-generation synchrotron radiation facility is
expected to improve the coherence and intensity of X-rays. In each lecture, various research results on imaging and spectroscopic techniques
were reported, ranging from basic beamline technologies to applied measurements, which can use the features of the new facility. The
newly-organized general discussion session (Moderator: Professor Abukawa from Tohoku University) provided an opportunity for in-depth
questions and answers about the contents of each lecture. In the last session, Director Harada presented the prospects and direction of the
SOR facility towards the operation start of the new synchrotron radiation facility in 2023.

66

ISSP Activity Report 2020

The International Workshop on Quantum Magnets in Extreme Conditions
March 22-26, 2021
Y. Kohama, F. Mila, and M. Jaime
This workshop was hold as an online virtual conference due to the COVID-19 pandemic. The main focus of this workshop
was the fascinating emergent physical properties of solid-state quantum magnets in both theoretical and experimental research
fields. The workshop was free of charge and started from 21:00 pm to 24:00 pm in JST (13:00 pm - 16:00 pm in CET and 8:00
am – 11:00 am in EDT) to encourage the participation of international students and upcoming international researchers. The
total number of registrations was 438. The numbers of participants on Monday, Tuesday, Wednesday, Thursday, and Friday
were 320, 234, 221, 179, and 151, respectively (the total number of participants was 1105). The 25 talks were given by theinvited speakers who are leading scientists in their field of research. It should be noted that the second international workshop
on Quantum Magnets in Extreme Conditions is tentatively scheduled in 2023 as a hybrid conference. We hope that the next
workshop can give us a chance to share novel idea and to exchange the forthcoming results in this exciting research fields.

ISSP Activity Report 2020

67

68
ISSP Activity Report 2020

Subjects of Joint Research
令和２年度 共同利用課題一覧（前期）/ Joint Research List (2020 First Term)
嘱託研究員 / Commission Researcher
No.

課題名

担当所員：森1

氏名自己組織化二分子膜における電子―プロトン相
関物性の探究

加藤

浩之

大阪大学

大学院理学研究 Study of electron -proton correlated properties in selfassembled bilayers
科

Name

Organization

Hiroyuki Kato

Osaka University

靖雄

金沢大学

理工学域

Yasuo Yoshida

Kanazawa University

Toshu AnJapan Advanced
Institute of Scienceand Technology

Silvia Haindl

Tokyo Institute ofTechnology

Ryota Takahashi

Nihon University

幸雄

2

極低温走査トンネル顕微鏡を用いた鉄カルコゲ
ナイド超伝導体 FeSeTe の研究吉田

3

走査トンネル顕微鏡による局所強磁性共鳴法の
開発

安

4

走査トンネル顕微鏡による Fe 系超伝導薄膜の評 シルビア
価インドル

担当所員：リップマー

ハ東京工業大学

科学技術創成研 Investigation of Fe-based superconducting thin films byscanning tunneling microscopy
究院

日本大学

工学部

鳥取大学

大学院工学研究 Advancement of the experimental data analysis for 2D material
Takeo Hoshi
structure
科

ミック
竜太

Development of Films Deposition System for High-throughput
Material Exploretion

直輝

二次元物質構造解析むけ実験データ解析の高度化

担当所員：上床Low-temperature STM study on iron-chalcogenide
superconductor FeSeTe

北陸先端科学技 先端科学技術研 Development of local ferromagnetic resonance in scanningtunneling microscopy
術大学院大学究科

東秀Materials Foundry のための材料開発システムの高橋
構築に向けた薄膜合成装置の開発

担当所員：川島
6

Title

初果

担当所員：長谷川

5

所属

美也

星

健夫

Tottori University

No.

課題名

氏名

所属

Title

Name

Organization

ISSP Activity Report 2020

7

希釈冷凍機温度で使用可能な 10GPa 級超高圧発
松林生装置の開発和幸

電気通信大学

大学院情報理工 Development of 10GPa class high pressure apparatus for low
temperature
学研究科

KazuyukiMatsubayashi

The University
of ElectroCommunications

8

高圧下量子振動観測システムの開発

摂待

力生

新潟大学

理学部

Rikio Settai

Niigata University

9

酸化物試料の作製と高圧下物性測定

川中浩史

産業技術総合研 電子光技術研究
Sample preparation and high pressure experiments
究所部門

Hirofumi Kawanaka

National Institute ofAdvanced Industrial
Science and Technology10

有機伝導体の圧力効果

村田惠三

大阪経済法科大 21 世紀社会研
学
究所

Keizo Murata

Osaka University of
economice and Law

11

3d 遷移化合物に関する圧力効果

鹿又武

東北学院大学

工学総合研究所 Effect of pressure on the 3d transition compounds

Takeshi Kanomata

Tohoku Gakuin
University

12

擬一次元有機物質の圧力下物性研究

糸井

充穂

日本大学

医学部

Study on pressure induced superconductivity of quasi organic
conductor

Miho Itoi

Nihon University

13

多重極限関連圧力装置の調整

高橋

博樹

日本大学

文理学部

Adjustment of Cubic Anvil apparatus

Hiroki Takahashi

Nihon University

14

高圧下 X 線回析法の開発

江藤

徹二郎

久留米工業大学 工学部

Development of High Pressure X-ray diffraction measurements Tetsujiro Eto

Kurume Institute ofTechnology15

極低温下の磁気特性

鳥塚潔

日本工業大学

共通教育学群

Development of magnetic measurement method

Kiyoshi Torizuka

Nippon Institute ofTechnology

16

圧力下 NMR 測定法に関する開発

藤原

直樹

京都大学

大学院人間・環 Development of NMR measurement method under highpressure
境学研究科

Kyoto University

Naoki Fujiwara

17

希土類 122 化合物における圧力効果

繁岡

透

山口大学

大学院理工学研
Pressure effect of rare earth 122 compounds
究科

Toru Shigeoka

Yamaguchi University

18

低温用マルチアンビル装置の開発

辺土

正人

琉球大学

理学部

Development of multi-anvil apparatus for low temperature

Masato Hedo

University of Ryukyus

19

磁性体の圧力効果

巨海

玄道

久留米工業大学 工学部

Effect of pressure on the Magnetic Materials

Gendo Oomi

Kurume Institute ofTechnology

20

DAC を用いた物性測定方法の開発

狩野みか

日本工業大学

共通教育学群

Development of physical property measurement method using
Mika Kano
DAC

Development of quantum oscillation under high pressure

Effect of pressure on the organic conductor

Nippon Institute ofTechnology

担当：中性子科学研究施設

69

21

4G における共同利用推進

佐藤

卓

東北大学

多元物質科学研
Research and Support of General-Use at 4G
究所

Taku Sato

Tohoku University

22

〃

奥山

大輔

東北大学

多元物質科学研究所

Daisuke Okuyama

Tohoku University〃

70
ISSP Activity Report 2020

No.

課題名

23

〃

氏名

所属

那波

和宏

東北大学

多元物質科学研
究所

Title
〃

Name

Organization

Kazuhiro Nawa

Tohoku University

24

6G、T1-1 における共同利用推進

岩佐

和晃

茨城大学

フロンティア応
用原子科学研究 Research and Support of General-Use at 6G and T1-1
センター

Kazuaki Iwasa

Ibaraki University25

T1-1、T1-3 における共同利用推進

大山

研司

茨城大学

大学院理工学研
Research and Support of General-Use at T1-1 and T1-3
究科

Kenji Ohoyama

Ibaraki University26

T1-1 における共同利用推進

桑原

慶太郎

茨城大学

大学院理工学研
Research and Support of General-Use at T1-1
究科

Keitaro Kuwahara

Ibaraki University

27

〃

横山

淳

茨城大学

理学部

〃

Makoto Yokoyama

Ibaraki University

28

〃

伊賀

文俊

茨城大学

大学院理工学研
究科〃

Fumitoshi Iga

Ibaraki University

藤田

全基

東北大学

金属材料研究所 Research and Support of General-Use at T1-2, T1-3 and 6G

Masaki Fujita

Tohoku University29

T1-2、T1-3、6G における共同利用推進

30

〃

南部

雄亮

東北大学

金属材料研究所〃

Yusuke Nambu

Tohoku University

31

〃

池田

陽一

東北大学

金属材料研究所〃

Yoichi Ikeda

Tohoku University

32

〃

谷口

貴紀

東北大学

金属材料研究所〃

Takanori Taniguchi

Tohoku University

木村

宏之

東北大学

多元物質科学研
Research and Support of General-Use at T2-2 and T1-3
究所

Hiroyuki Kimura

Tohoku University

33

T2-2、T1-3 における共同利用推進

34

〃

坂倉

輝俊

東北大学

多元物質科学研究所〃

Terutoshi Sakakura

Tohoku University

35

〃

山本

孟

東北大学

多元物質科学研究所〃

Hajime Yamamoto

Tohoku University36

C1-2 における共同利用推進

杉山

正明

京都大学

複合原子力科学
Research and Support of General-Use at C1-2
研究所

Masaaki Sugiyama

Kyoto University37

C1-2、C2-3-1 における共同利用推進

井上

倫太郎

京都大学

複合原子力科学
Research and Support of General-Use at C1-2 and C2-3-1
研究所

Rintaro Inoue

Kyoto University

守島

健

京都大学

複合原子力科学研究所

Ken Morishima

Kyoto University

日野

正裕

京都大学

複合原子力科学
Research and Support of General-Use at C3-1-2 and C2-3-1
研究所

Masahiro Hino

Kyoto University

38
39

〃
C3-1-2、C2-3-1 における共同利用推進

〃

No.
40

課題名
C3-1-2 における共同利用推進

氏名

所属

Title

Name

Organization

田崎

誠司

京都大学

大学院工学研究
Research and Support of General-Use at C3-1-2科

Seiji Tasaki

Kyoto University

41

〃

小田

達郎

京都大学

複合原子力科学研究所〃

Tatsuro Oda

Kyoto University

42

〃

北口

雅暁

名古屋大学

大学院理学研究科〃

Masaaki Kitaguchi

Nagoya University

中川

慎太郎

東京大学

生産技術研究所 Research and Support of General-Use at C1-2 and C2-3-1

Shintaro Nakagawa

The University of
Tokyo

野口

悟

大阪府立大学

大学院理学系研 Development of adiabatic demagnetization cooling system forpulsed fields
究科

Satoru Noguchi

Osaka Prefecture
University

Kaname Kanai

Tokyo University of
ScienceAkio Kimura

Hiroshima University

Takayuki Kisu

Osaka University

43

C1-2、C2-3-1 における共同利用推進

担当所員：徳永44

将史

パルス強磁場用断熱消磁冷却システムの開発担当所員：近藤猛

ISSP Activity Report 202045

有機化合物の光電子分光

金井要

東京理科大学理工学部

46

トポロジカル絶縁体の電子状態の解明

木村

昭夫

広島大学

大学院理学研究
Electronic-structure study of topological insulators
科

47

光電子分光法を用いた各種分子性結晶の電子状態の研究及び装置の低温化

木須

孝幸

大阪大学

基礎工学研究科48

トポロジカル超伝導体の探索

坂野

昌人

東京大学

大学院工学系研Research for topological insulators
究科

Masato Sakano

The University of
Tokyo

49

高分解能光電子分光による強相関物質の研究

横谷

尚睦

岡山大学

異分野基礎科学
Ultra-high resolution study on strongly correlated materials
研究所

Takayoshi Yokota

Okayama University

理化学研究所

創発物性科学研
Laser-ARPES on Fe superconductor
究センター

Takahiro Shimojima

RIKEN

担当所員：岡﨑

Photoemission study on organic compounds

Research on electron state of molecular crystals using
photoemission spectroscopy

浩三

71

50

鉄系超伝導体のレーザー光電子分光

下志万

51

60-eV レーザーを用いた時間分解光電子分光の
開発

石坂

香子

東京大学

大学院工学系研 The development of time-resolved photoemission using 60eV
laser
究科

Kyoko Ishizaka

The University of
Tokyo

52

固体中のマヨラナ粒子の研究

松田

祐司

京都大学

大学院理学研究 Study of Majorana Fermion in Solids by Laser Photoemission
Spectroscopy
科

Yuji Matsuda

Kyoto University

佐藤

昌利

京都大学

基礎物理学研究所

Masatoshi Sato

Kyoto University

53

〃

貴博

〃

72
ISSP Activity Report 2020

No.

課題名

54

レーザー励起光電子顕微鏡を使った抵抗変化メ
モリ材料の研究木下健太郎

東京理科大学

理学部

Study on Materials for Resistive Switching Memories using
laser-PEEM

Kentaro Kinoshita

The University of
Tokyo

55

収差補正型光電子顕微鏡の建設と利用研究

小嗣真人

東京理科大学

基礎工学部

Construction and utilization research of aberration correction
photoelectron emission microscopy

Masato Kotsugi

Tokyo University of
Science

56

FeSe 超伝導体における BCS-BES クロスオーバ
ーの研究

紺谷

浩

名古屋大学

大学院理学研究
Study of BCS-BES crossover in FeSe superconductors
科

Hiroshi Kontani

Nagoya University

57

時間分解光電子分光を用いた強相関物質の研究

溝川

貴司

早稲田大学

理工学術院

Takashi Mizokawa

Waseda University

58

時間分解光電子分光や超高分解能光電子分光を用いた超伝導体や強相関物質の研究

吉田

鉄平

京都大学

総合人間学部 /Laser ARPES study on superconductors and strongly-correlated
Teppei Yoshida
人間・環境学研
materials
究科

Kyoto University59

超高分解能レーザー光電子分光による高温超伝
導体の研究

チャン
イル

上智大学

機能創造理工学 Study of high -Tc superconductors by high-resolution laser
ARPES
科

Sophia University

60

テラヘルツ光源を用いた光誘起絶縁体 - 金属転移久保田の研究担当所員：原田

氏名

ウェ

雄也

所属

Title

Time-resolved photoemission study on strongly-correlatedmaterials

Name

Weilu Zhang

Organization

放射光科学研究 XFEL 研究開発
センター
部門

Investigation of the photo-induced insulator-to-metal transition
Yuya Kubota
by terahertz optics

JASRI

大阪大学

Construction of a noble system for circular and linear
dichroism in soft X-ray emission and RIXS spectroscopy

Shigemasa Suga

Osaka University

慈久61

軟 X 線発光・共鳴非弾性散乱分光の磁気円・線二色性測定システムの構築

菅62

軟 X 線吸収 / 発光分光法によるリチウムイオン
電池電極材料の電子物性研究

細野英司

産業技術総合研 省エネルギー研 Study on the electronic property of electrode materials for Liion batteries by soft X-ray absorption/emission spectroscopy
究所
究部門

Eiji Hosono

AIST

63

〃

朝倉

大輔

産業技術総合研究所

Daisuke Asakura

AIST

64

高分解能光電子分光による酸化バナジウムの研
究

藤原

秀紀

大阪大学

大学院基礎工学
Study on vanadium oxides by high resolution Photoemission
研究科

Hidenori Fujiwara

Osaka University

65

省エネ・創エネ・蓄電デバイスのオペランド分
光

尾嶋

正治

東京大学

大学院工学系研 Operando nano-spectroscopy for energy efficient, power
generation and energy storage devices
究科

Masaharu Oshima

The University of
Tokyo

66

原子レベルで制御されたモデル有機分子表面上の界面水の電子状態観測

林

東京工業大学

物理工学院

Analysis of the electronic structure of the interfacial water
formed on model organic surfaces

Tomohiro Hayashi

Tokyo Institute ofTechnology

67

三次元 nanoESCA による実デバイスのオペラン
永村
ド電子状態解析直佳

物質・材料研究機構

Operando analysis of the electronic structure of actual device
by 3DnanoESCA

Naoka Nagamura

National Institute forMaterials Science68

時間分解光電子顕微分光実験の開発

豊彦

高輝度光科学研究センター

Technical development of time-resolved photoemission
microscopy measurement

Toyohiko Kinoshita

JASRI

担当所員：松田

巌

滋正

木下

智広

産業科学研究所

〃

No.

課題名

氏名

所属

Title

Name

Organization69

スピン分解光電子分光の測定技術開発

木村

真一

大阪大学

大学院生命機能 Technical development of spin-resolved photoemission
spectroscopy measurement研究科

70

時間分解磁気光学実験の技術開発

小嗣真人

東京理科大学

基礎工学部

71

超高速磁化応答による磁性波動関数の制御

小林

正起

東京大学

大学院工学系研 Regulation of magnetic wave functions by ultrafast
magnetization response
究科72

コヒーレント共鳴軟 X 線散乱による磁気ドメイン構造の観測山崎裕一

統合型材料開Observation of magnetic domain structure for ferromagnetic
物質・材料研究
発・情報基盤部
thin films by means of resonant soft x-ray scattering
機構
門

73

遷移金属化合物の時間分解 X 線分光と回析

和達大樹

兵庫県立大学

大学院物質理学 Time-resolved x-ray spectroscopy and diffraction of transitionHiyoki Wadachi
metal-compounds
研究科

University of Hyogo74

雰囲気光電子分光装置の高度化

山本

達

東北大学

多元物質科学研
Updates of the NAP-XPS machine
究所

Susumu Yamamoto

Tohoku University

75

偏光制御型軟 X 線分光装置の開発

平田

靖透

防衛大学校

応用物理学科Yasuyuki Hirata

National Defense
AcademyTechnical development of time-resolved magneto-opticalexperiment

Development of a system for the polarization-controlled soft
X-ray spectroscopy

Shin-ichi Kimura

Osaka University

Masato Kotsugi

Tokyo University of
Science

Masaki Kobayashi

The University ofTokyo

Yuichi Yamasaki

NIMS

一般研究員 / General Researcher
No.

課題名

担当所員：瀧川

ISSP Activity Report 2020

1

Title

細越

裕子

大阪府立大学

大学院理学系研 NMR study on the magnetodielectric properties of organic
equilateral triangular spin system
究科

Name

Organization

一成

立命館大学

理工学部

青山学院大学

理工学部

Yuko Hosokoshi

Osaka Prefecture
University

Determination of pairing symmetry in heavy Fermion
superconductors

Kazushige Machida

Ritsumeikan
University

Study of the nematic phase of topological superconductors

Yue SunAoyama Gakuin
University

Miyazawa Takamaro

Aoyama Gaguin
University

俊郎

2

重い電子系超伝導体の対称性の決定町田

3

トポロジカル超伝導のネマチック相研究

孫

4

所属

仁

正三角スピン有機トリラジカルの核磁気共鳴による磁気誘電現象の解明

担当所員：榊原

氏名

〃

悦

73

宮沢

貴麿

青山学院大学

理工学部

5

空間反転対称性の破れた重い電子系物質 CeIrSi3
木村のフェルミ面転移憲彰

東北大学

大学院理学研究 Fermi surface reconstruction in noncentrosymmetric heavy
fermion compound CeIrSi3科

Noriaki Kimura

Tohoku University

6重い電子系化合物における量子臨界現象

淳

茨城大学

大学院理工学研
Quantum critical behavior in heavy-fermion compounds
究科

Makoto Yokoyama

Ibaraki University

横山

〃

74
ISSP Activity Report 2020

No.

課題名

7

〃

8

氏名

所属

Title

Name

ラフマント

茨城大学

大学院理工学研
究科

新奇ウラン系スピン三重項超伝導体における極低温精密磁化・熱膨張測定

清水

悠晴

東北大学

金属材料研究所

9

有機ラジカルから成るフラストレート系の低温
物性測定

山口

博則

大阪府立大学

大学院理学系研 Low-temperature physical properties of frustrated spin systems
Hironori Yamaguchi
composed of organic radicals
究科10

磁場方位制御下における Sr2RuO4 の極低温磁歪
測定

橘高

俊一郎

中央大学

理工学部

11

〃

河野

洋平

中央大学

理工学部

12

遍歴電子メタ磁性系及びフラストレーション系の極低温比熱測定齋藤明子

Investigation of Itinerant-electron Metamagnetism and
物質・材料研究 液体水素材料研
Geometrically-frustrated Spin-systems by Low-temperature機構
究センター
Specific-heat Measurements

担当所員：山下〃Rahmanto

Novel spin-triplet uranium superconductors studied by precise
Yusei Shimizu
magnetization and thermal-expansion measurements

Low-temperature magnetostriction measurement on
Sr2RuO4 under precise control of field orientation〃

Organization
Ibaraki University
Tohoku University
Osaka Prefecture
University

Shunichiro Kittaka

Chuo University

Yohei Kono

Chuo University

Akiko T. Saito

National Institute forMaterials Science

Yoshitomo Karaki

University of the
Ryukyus穰
Low temperature specific heat measurements
antiferromagnets.

of triangular13

三角格子反強磁性体の低温比熱測定

柄木

良友

琉球大学

教育学部

14

YbRh2Si2 の超低温における dHvA 効果測定

宍戸寛明

大阪府立大学

大学院工学研究 dHvA effect measurements on YbRh2Si2 at ultra-low
temperatures
科

Hiroaki Shishido

Osaka Prefecture
University

15

熱輸送測定による量子常誘電・常磁性状態の研
究

下澤

雅明

大阪大学

大学院基礎工学 Studies of quantum disordered states of electric and magnetic
dipoles by thermal transport measurements
研究科

Masaaki Shiozawa

Osaka University

福田昭

兵庫医科大学

物理学教室

Akira Fukuda

Hyogo College ofMedicine

士郎

山形大学

大学院理工学研 Hall coefficient measurement of 2D cuprates and measurement
Shiro Kambeof magnetic property by MPMS Ⅱ
究科

Yamagata University

島袋

義仁

山形大学

大学院理工学研
究科〃

Yoshihito
Shimabukuro

Yamagata University

米谷

玲皇

東京大学

大学院新領域創Research on nanosensing device
成科学研究科

Reo Kometani

The University of
Tokyo

東京大学

大学院新領域創成科学研究科〃Xuesi LiThe University of
Tokyo

東京大学

大学院新領域創成科学研究科〃

Masaki Saito

The University ofTokyo

担当所員：勝本信吾

16

量子ホール効果のための高移動度半導体試料作製と超低温での測定

17

二次元銅酸化物のホール測定と MPMS による磁
神戸
化の測定

18
19

〃
ナノセンシングデバイスの研究

20

〃

黎

21

〃

齊藤

学思
正樹

Development of the high mobility semiconductor samples forthe quantum Hall state and their measurements in very low
temperature

No.

課題名

22

〃

橋本

将

東京大学

大学院新領域創成科学研究科〃Sho Hashimoto

The University of
Tokyo

23

〃

田中

駿太郎

東京大学

大学院新領域創成科学研究科〃Shuntaro Tanaka

The University of
Tokyo

石黒

亮輔

日本女子大学

理学部

Ryosuke Ishiguro

Japan Women's
University

あや日本女子大学

理学部

Aya Hamamoto

Japan Women's
University

熊本大学

大学院先端科学 Quantum transport in a graphene on a titanium oxide
nanosheet
研究部

Masahiro Hara

Kumamoto University

Daiki Shite

Kumamoto University

Hideki Narita

Kyoto University

24

Ti/MoS2 界面における超伝導状態の研究

氏名

所属

Title

Study of superconductivity at a Ti/MoS2 interface

Name

25

〃

浜本

26

酸化チタンナノシート上グラフェンの量子輸送

原

27

〃

志手

大輝

熊本大学

大学院自然科学教育部

28

微細素子化した強相関物質における電流誘起された電子相の開拓 2

成田

秀樹

京都大学

大学院理学研究 Investigation of electric current induced electronic phase in a
microfabricated strongly correlated materials 2科

大阪大学

Scanning Tunneling Spectroscopy of surfaces of exotic rare
産業科学研究所 earth and transition metal compounds and adsorbed magnetic Shigemasa Sugaatoms

担当所員：小森正大〃〃

Organization

文夫

ISSP Activity Report 202029

特異なスピン状態を持つ希土類及び遷移金属化
合物表面及び吸着磁性原子電子状態とスピン状態の STS 解析

菅30

窒素を飽和吸着させた Cu(001) 面における構造
緩和（２）

山田

正理

中央大学

理工学部

Structural relaxation on a Cu(001) surface saturated withadsorbed nitrogen (2)Masamichi Yamaada Chuo University

31

微傾斜 Si(111) √ 3 ×√ 3-B 基板上に成長した
Bi(110) 超薄膜の電子状態

中辻寛

東京工業大学

物質理工学院

Electronic structure of Bi(110) thin films grown on vicinal
Si(111) √ 3 ×√ 3-B substrates

Kan Nakatsuji

Tokyo Institute ofTechnology

中村玲雄

東京工業大学

物質理工学院

Leo Nakamura

Tokyo Institut ofTechnology

寛

東京工業大学

物質理工学院

Kan Nakatsuji

Tokyo Institute ofTechnology

Akihiro Kimura

Tokyo Institute ofTechnology

32
33

〃

滋正

酸素サーファクタントを用いた Fe 薄膜の成長過中辻程と電子状態〃
Oxygen surfactant assisted growth of Fe thin-films and theirelectronic states

Osaka University

75

34

〃

木村

彰博

東京工業大学

物質理工学院

35

真空転写法により形成したツイストグラフェンの電子状態評価

田中

悟

九州大学

大学院工学研究 Evaluation of electronic structures of twisted graphenefabricated by vacuum transfer technique
院

Satoru Tanaka

Kyushu University

36

〃

今村

均

九州大学

大学院工学府

Hitoshi Imamura

Kyushu University

SiC ナノ周期表面上に転写したグラフェンの電子
田中
状態の観察

悟

九州大学

大学院工学研究 Evaluation of electronic structures of graphene transferred on
SiC periodic nanosurfaces
院

Satoru Tanaka

Kyushu University

37

〃

〃

76
ISSP Activity Report 2020

No.

課題名

38

〃

氏名

所属

Title

魚谷

亮介

九州大学

大学院工学府宮町

俊生

電気通信大学

情報理工学研究 Low-temperature/High-magnetic field STM of strongly
correlated topological insulators
科40

走査トンネル顕微鏡を用いた重い電子系 Eu 化合
志賀物の電子状態測定雅亘

九州大学

大学院工学府41

IV 族二次元材料及びそのヘテロ構造の低温走査トンネル顕微鏡観察高村由起子

北陸先端科学技 マテリアルサイ STM investigation of group IV 2D materials and theirheterostructures
術大学院大学
エンス系

42

原子層物質√７×√ 3-In の超伝導に対する界面の
影響

平山

博之

東京工業大学

理学院

43

〃

荻野

嵩大

東京工業大学理学院

39

強相関トポロジカル絶縁体の極低温・強磁場
STM 観察

担当所員：長谷川Electronic density of state measurement of Eu-heavy fermion
system using STM techniqueInterface effect on the superconductivity of the √７×√ 3-In
atomic layer material
〃

大久保

勇男

物質・材料研究 機能性材料研究 High-throughput thin film growth combined with a machinelearning approach機構
拠点

Kyushu University

Toshio Miyamachi

The University
of ElectroCommunications

Masanobu Shiga

Kyushu University

Yukiko Takamura

JAIST

Hiroyuki Hirayama

Tokyo Institute ofTechnology

Takahiro Ogino

Tokyo Institute ofTechnology

Isao Ohkubo

National Institute forMaterials Science

Ryo Nouchi

Osaka Prefecture
University

Noriyuki Tsukahara

National Institute ofTechnology (KOSEN),
Gunma College

淳

45

遷移金属酸化物ナノシート表面への欠陥導入による外来分子吸着の制御

野内亮

大阪府立大学46

有機金属構造体薄膜−超伝導体界面の構築

塚原規志

群馬工業高等専 電子メディア工 Building up the interface between a metal-organic framework
film and a superconductor
門学校
学科

担当所員：秋山Ryosuke Uotani

ミック

機械学習を導入した高効率薄膜作製手法の開発

担当所員：吉信

Organization

幸雄

担当所員：リップマー
44

〃

Name

大学院工学研究 Control of molecular adsorption on transition metal oxide
nanosheet films by introduction of surface defects
科

英文

47

エルビウムデルタドープ GaAs の発光特性評価

矢口

裕之

埼玉大学

大学院理工学研
Luminescence properties of Er delta-doped GaAs
究科

Hiroyuki Yaguchi

Saitama University

48

〃

高宮

健吾

埼玉大学

総合技術支援センター〃

Kengo Takamiya

Saitama University

49

〃

清水

椋平

埼玉大学

大学院理工学研
究科〃

Ryohei Shimizu

Saitama University

俊

香川大学

創造工学部

Shyun Koshiba

Kagawa University

50

Si 基板上に直接成長させた GaN の成長条件が光
小柴
学特性に及ぼす影響

Influence of growth conditions of GaN on Si substrate on
optical properties

No.

課題名

51

〃

石川

由依

香川大学

工学部

52

希薄磁性半導体 GaGdAs を用いたスピン LEDの発光の増強と円偏光度制御

宮川

勇人

香川大学

創造工学部

53

〃

森健

香川大学

工学部

孝雄

静岡大学

ジュマエダ・
ジャトミカ

成田

固体基板上に作製された強磁性 CoPt 規則相の磁山浦
化測定

担当所員：大谷
54

義近、中辻

〃

担当所員：大谷
56

57

Title

Name

Organization〃

Yui Ishikawa

Kagawa University

Hayato Miyagawa

Kagawa University〃

Takeshi Mori

Kagawa University

学術院理学領域

Physical properties in rare earth intermetallic compounds athigh magnetic fields in low temperature

Takao Ebihara

Shizuoka University

静岡大学

大学院自然科学
教育部〃

Jumaeda Jatmika

Shizuoka University

秀樹

京都大学

大学院理学研究 Investigation of electric current induced electronic phase in a
microfabricated strongly correlated materials
科

Hideki Narita

Kyoto University

淳一

東京工業大学

元素戦略研究セ Magnetization measurement of ferromagnetic CoPt orderedphases fabricated on solid substrates
ンター

Junichi Yamaura

Tokyo Institute ofTechnology

Intensity enhancement and circular polarization control ofspin-polarized light-emitting diodes using diluted magnetic
semiconductor

海老原

義近

微細素子化した強相関物質における電流誘起された電子相の開拓担当所員：廣井所属

知希土類金属間化合物の強磁場低温物性研究

55

氏名

善二

ISSP Activity Report 2020

77

58

〃

真島

豊

東京工業大学

科学技術創成研究院〃

Yutaka Majima

Tokyo Institute ofTechnology

59

〃

遠山

諒

東京工業大学

物質理工学院〃

Ryo Toyama

Tokyo Institute ofTechnology

60

新しい Jeff=0 スピン軌道結合モット絶縁体の磁気特性に関する研究原口祐哉

東京農工大学

大学院工学研究 Investigation of magnetism in the novel Jeff=0 spin orbit
coupled Mott insulators
院

Yuya Haraguchi

University ofAgriculture andTechnology

61

希土類 4f 電子数制御による新規体積変化アクチュエーター材料の創製

横山

泰範

名古屋大学

大学院工学研究 Development of novel volume-change-driven actuatormaterials by control of rare earth 4f electron number
科

Yasunori Yokoyama

Nagoya University

62

〃

竹中

康司

名古屋大学

大学院工学研究
科〃

Koshi Takenaka

Nagoya University

63

〃

長谷川

名古屋大学

大学院工学研究科〃

Haruka Hasegawa

Nagoya University

64

〃

渋谷

名古屋大学

大学院工学研究
科〃

Junya Shibutani

Nagoya University

遥加
隼矢

78

No.

課題名

ISSP Activity Report 2020

担当所員：川島

氏名

所属

Title

Name

Organization

直輝

65

テンソルネットワーク中のエンタングルメント
最適化法の開発

原田

健自

京都大学

大学院情報学研 Development of entanglement optimization method in tensor
networks
究科

Kenji Harada

Kyoto University

66

蜂の巣格子拡張 Kitaev- Γ模型の基底状態相図２ 鈴木隆史

兵庫県立大学

大学院工学研究 Ground-state phase diagram of the extended Kitaev- Γ model
on a honeycomb lattice 2科

Takafumi Suzuki

University of Hyogo

松本

圭介

愛媛大学

大学院理工学研
Magnetocaloric effect in Hf1-xTaxFe2By
究科

Keisuke Matsumoto

Ehime University

高畦

恋

愛媛大学

大学院理工学研
究科

Ren Takaaze

Ehime University

松本

圭介

愛媛大学

大学院理工学研
Specific heat study of Ho1-xErxCuSi
究科

Keisuke Matsumoto

Ehime University

小林

将己

愛媛大学

大学院理工学研
究科

Masaki Kobayashi

Ehime University

透

山口大学

大学院創成科学 Crystal growth and characterization of pseudo-ternarycompounds Ce1-xLaxNiC2
研究科

Toru Shigeoka

Yamaguchi University

清晴

沖縄キリスト教
英語科
短期大学

Kiyoharu Uchima

Okinawa Christian
Junior College

透

山口大学

Toru Shigeoka

Yamaguchi University

内間清晴

沖縄キリスト教
英語科
短期大学

Kiyoharu Uchima

Okinawa Christian
Junior College

Osamu Nakamura

Okayama University of
Science

Kiyoharu Uchima

Okinawa Christian
Junior College

Toru Shigeoka

Yamaguchi University

担当所員：上床67

美也

六方晶 Hf1-xTaxFe2By の磁気熱量効果

68
69

〃
希土類三元系合金 Ho1-xErxCuSi の比熱

70
71

〃

擬三元化合物 Ce1-xLaxNiC2 の結晶育成と物質評
繁岡
価3

72
73

〃

内間

擬三元化合物 CeNi1-xPdxC2 の結晶育成と物質評
繁岡
価

74

〃

〃

〃

〃

大学院創成科学 Crystal growth and characterization of pseudo-ternarycompounds CeNi1-xPdxC2
研究科〃

研究 ･ 社会連携
Magnetic and transport properties in YbH2+x
センター

75

YbH2+x の磁性と伝導中村修

岡山理科大学76

多型化合物 RIr2Si2 (R = 希土類 ) 磁気特性 6

内間清晴

沖縄キリスト教
英語科
短期大学

Magnetic characteristics of polymorphic compounds
RIr2Si2 (R=Rare earth)6

77

〃

繁岡

透

山口大学

大学院創成科学研究科

78

ハーフメタルホイスラー合金の磁気体積効果に
関する研究

重田

出

鹿児島大学

大学院理工学研 Study on the magneto-volume effect of half-metallic Heusler
alloys究科

Iduru Shigeta

Kagoshima University

79

〃

辻川

聡一朗

鹿児島大学

理学部

Soichiro Tsujikawa

Kagoshima University

〃

〃

No.

課題名

氏名

所属

Title

Name

Organization

Yoshitomo Karaki

University of the
Ryukyus

大学院創成科学 Specific heat measurement under magnetic field of
Ho1-xLaxRh2Si2 single crystal II
研究科

Tetsuya Fujiwara

Yamaguchi University

山口大学

大学院創成科学研究科

Yuya Nishizaki

Yamaguchi University

哲也

山口大学

大学院創成科学 Magnetization measurements of pseudo-ternary system
HoRh2-xPd2Si2
研究科

Tetsuya Fujiwara

Yamaguchi University

金子

達哉

山口大学

理学部

Tatsuya Kaneko

Yamaguchi University

藤原

哲也

山口大学

大学院創成科学 Single crystal growth of Co substituted HoRh2-xPdxSi2
compounds
研究科

Tetsuya Fujiwara

Yamaguchi University

杉田

静留

山口大学

理学部

Shizuru Sugita

Yamaguchi University

藤原

哲也

山口大学

大学院創成科学 Specific heat measurement under magnetic field of
EuMn2Ge2 single crystal II
研究科

Tetsuya Fujiwara

Yamaguchi University

小林

遼平

山口大学

理学部

Ryohei Kobayashi

Yamaguchi University

Ta2NiSe5 の Ta,Ni サイト置換物質における高圧
広瀬
力下電気抵抗測定

雄介

新潟大学

理学部

佐野

純佳

新潟大学

大学院自然科学研究科

磁気転移を示す Ce 化合物の高圧力下電気抵抗測
広瀬
定

雄介

新潟大学

理学部

山田

峻輔

新潟大学

大学院自然科学研究科

93

高圧下における (Fe1-xZnx)2Mo3O8 の電気磁気特
赤星
性

大介

東邦大学

理学部

94

MnCo1-xGe 合金の磁気特性に関する研究 (3)

江藤

徹二郎

久留米工業大学 共通教育科

95

有機伝導体物性に与える高圧力媒体の分子形状
の効果

村田

96

鉄系超伝導体 FeSe1-xTex の高圧下電子相図の研
究

芝内

80

三角格子反強磁性体の低温磁性

柄木

良友

琉球大学

教育学部

81

Ho1-xLaxRh2Si2 単結晶の磁場中比熱測定 (2)

藤原

哲也

山口大学

西崎

裕哉

藤原

82
83
84
85
86
87
88
89

ISSP Activity Report 2020

90
91
92

〃
混晶系 HoRh2-xPd2Si2 の磁化測定〃
HoRh2Si2 の Pd 置換系化合物の単結晶育成〃
EuMn2Ge2 単結晶の磁場中比熱測定 (2)〃〃〃Low temperature magnetism of triangular antiferromagnets

〃

〃

〃

〃

Electrical resistivity measurement under pressure of Ta/Ni site
Yusuke Hirose
substituted Ta2NiSe5〃

Niigata University

Sumika Sano

Niigata University

Electrical resistivity measurement under pressure magnetic Ce
Yusuke Hirose
compoundNiigata University〃

79

Shunsuke Yamada

Niigata University

Magnetoelectric properties of (Fe1-xZnx)2Mo3O8 under highpressures

Daisuke Akahoshi

Toho University

Study of magnetic properties in MnCo1-xGe alloys(3)Tetsujiro Eto

Kurume Institute ofTechnology

惠三

大阪経済法科大 ２１世紀社会総 Effect of Molecular Shape of the High Pressure Medium to the
Keizo Murata
学合研究センター Properties of Organic Conductors.

Osaka University of
Economics and Law

孝禎

東京大学

大学院新領域創 Studies on electrical phase diagrams under high pressure in
FeSe1-xTex
成科学研究科The University ofTokyo

Takasada Shibauchi

80
ISSP Activity Report 2020

No.

課題名

氏名

所属

97

〃

橋本

顕一郎

東京大学

98

〃

向笠

清隆

三井

Title

Name

大学院新領域創成科学研究科〃

Kenichiro Hashimoto

The University of
Tokyo

東京大学

大学院新領域創成科学研究科〃Kiyotaka Mukasa

The University of
Tokyo

好古

鹿児島大学

大学院理工学研
In-field annealing effects on the Cu2MnAl alloys
究科

Yoshifuru Mitsui

Kagoshima University

中川

駿

鹿児島大学

大学院理工学研
究科

Shun Nakagawa

Kagoshima University

101 Sm2Fe17N3 化合物の磁場中相成長

三井

好古

鹿児島大学

大学院理工学研
In-field phase growth of Sm2Fe17N3 compounds
究科

Yoshifuru Mitsui

Kagoshima University

102

高橋

巡季

鹿児島大学

大学院理工学研
究科

Junki Takahashi

Kagoshima University

103 Yb(Co1-xNix)2Zn20 の 極低温磁化測定

阿曽

尚文

琉球大学

理学部

Naofumi Aso

University of the
Ryukyus

104

金城

龍廣

琉球大学

理学部

Tatsuhiro Kinjo

University of the
Ryukyus105 圧力誘起価数転移の探索と高圧下輸送特性

辺土

正人

琉球大学

理学部

106

仲間

隆男

琉球大学

理学部

107 磁場で制御した Sm2Fe17H3 の磁気特性

小山

佳一

鹿児島大学

108

尾上

昌平

高圧下電気抵抗測定による新規分子導体
109 β '-(BEST)2CuCl2 の温度圧力相図の決定と超伝
導相の探索

小林

110

〃

111
112

99
100

Cu2MnAl 合金への磁場中熱処理効果
〃

〃

〃

〃

〃
Low-temperature magnetization measurements in
Yb(Co1-xNix)2Zn20〃

Searching of pressure-induced valence transition and transport
Masato Hedo
properties under high pressure

Organization

University of the
Ryukyus

Takao Nakama

University of the
Ryukyus

大学院理工学研 Magnetic properties of Sm2Fe17H3 prepared under magnetic
fields究科

Keiichi Koyama

Kagoshima University

鹿児島大学

大学院理工学研
究科

Masahira Onoue

Kagoshima University

拓矢

埼玉大学

大学院理工学研
conductor β '-(BEST)2CuCl2 and search for superconducting phase by
究科

Takuya Kobayashi

Saitama University

谷口

弘三

埼玉大学

大学院理工学研
究科〃

Hiromi Taniguchi

Saitama University

〃

伊藤

有咲

埼玉大学

大学院理工学研
究科〃

Arisa Ito

Saitama University

〃

菅原

佳哉

埼玉大学

理学部

〃

Yoshiya Sugawara

Saitama University

久田

旭彦

徳島大学

大学院社会産業
Effect of pressure and substitution in iron-selenide compounds Akihiko Hisada
理工学研究部〃〃

113 鉄セレン系化合物における圧力効果と置換効果〃〃
Determination of pressure-temperature phase diagram of new molecularmeasuring electrical resistivity under high pressures

Tokushima University

No.

課題名

114

〃

森野

瑛介

徳島大学

理工学部

115

反強磁性ホイスラー合金 Ru2MnZ (Z= Ge, Sn,Sb) のネール温度の圧力効果

安達

義也

山形大学

116

〃

渡辺

健

本多

117 ウラン化合物の磁性の圧力効果

氏名

所属

Title

Name

〃

Eisuke Morino

Tokushima Univercity

大学院理工学研 Pressure effect of the Neel temperature for the
antiferromagnetic Heusler alloys Ru2MnZ (Z= Ge, Sn, Sb)
究科

Yoshiya Adachi

Yamagata University

山形大学

大学院理工学研究科

Ken Watanabe

Yamagata University

史憲

東北大学

金属材料研究所 Effect of Pressure on the magnetism of uranium compounds

Fuminori Honda

Tohoku University〃

Organization

ISSP Activity Report 2020

81

118

Ni2MnZ (Z= In, Sn, Sb) 強磁性ホイスラー合金の磁化の圧力効果

安達

義也

山形大学

大学院理工学研 Pressure effect of the magnetization for the ferromagnetic
Heusler alloys Ni2MnZ (Z= In, Sn, Sb)
究科

Yoshiya Adachi

Yamagata University

119

〃

吉田

圭吾

山形大学

大学院理工学研
究科

Keigo Yoshida

Yamagata University

120 重い電子系強磁性体の圧力下 dHvA 効果

摂待

力生

新潟大学

理学部

Rikio Settai

Niigata University

121

三橋

大貴

新潟大学

理学部

〃

Daiki Mitsuhashi

Niigata University

122 Ce2RuGe の圧力下電気抵抗測定

摂待

力生

新潟大学

理学部

Electrical resistivity measurement of Ce2RuGe under pressure

Rikio Settai

Niigata University

123

〃

池田

悠

新潟大学

理学部

〃

Yu Ikeda

Niigata University

124

金属絶縁体転移を持つ Cu(Ir1-xRhx)2S4 の高圧下
磁性

伊藤

昌和

鹿児島大学

総合科学域総合 Magnetic properties of Cu(Ir1-xRhx)2S4 with the metal-insulator
Masakazu Itotransition in high pressure
教育学系

Kagoshima University

125

〃

鹿島

頌太

鹿児島大学

大学院理工学研
究科〃

Shota Kashima

Kagoshima University

126

〃

今村

有助

鹿児島大学

大学院理工学研
究科〃

Yusuke Imamura

Kagoshima University

127

ハニカム格子を含むアクチノイド化合物の高圧
物性

芳賀

芳範

日本原子力研究 先端基礎研究セ High-pressure physical properties of uranium compound
having honeycomb structure
開発機構
ンター

Yoshinori Haga

Japan Atomic Energy
Agency128 S 置換した FeSe の低温 NMR 測定

藤原

直樹

京都大学

大学院人間・環Low-temperature NMR study on S-substituted FeSe
境学研究科

Naoki Fujiwara

Kyoto University

129

〃

桑山

昂典

京都大学

大学院人間・環境学研究科〃

Takanori Kuwayama Kyoto University

130

〃

中村

昂矢

京都大学

大学院人間・環境学研究科〃

Kouya Nakamura〃〃
de Haas-van Alphen effect in heavy fermion ferromagnet
compound under pressure

Kyoto University

82

No.

ISSP Activity Report 2020

課題名

氏名

131

実験と計算の協奏による二次元材料の構造・電子状態解析及び制御

アントワーヌフロランス

Analysis and control of crystal and electronic structures of 2D
北陸先端科学技 マテリアルサイ
materials through concerted collaboration of experiment andAntoine Fleurence
術大学院大学
エンス系
theory

JAIST

132

〃

新田

寛和

北陸先端科学技 先端科学技術研
術大学院大学
究科

Hirokazu Nitta

JAIST

133 空間反転対称性の破れた超伝導体の結晶性評価

古川

はづき

お茶の水女子大 基幹研究院
学
然科学系

Hazuki Furukawa

Ochanomizu
University

134 中性子回折研究用単結晶試料の結晶性評価

阿曽

尚文

琉球大学

理学部

Crystal quality evaluation of single crystals for neutron
diffraction

Naofumi Aso

University of the
Ryukyus

多縮重度系の (Y,Yb)T2Zn20 (T = 遷移金属元素 )池田における不純物近藤効果の熱力学的検証

陽一

東北大学

金属材料研究所

Thermodynamical verification of the impurity-Kondo effect on
Yoichi Ikeda
a multiplet system (Y,Yb)T2Zn20 (T = transition-metal elements)

浩明

京都大学

大学院理学研究 Magnetism of kagome lattice titanium fluorides with small
distortion
科

Hiroaki Ueda

Kyoto University

京都大学

大学院理学研究科

Masahiro Hayashi

Kyoto University

千城

京都大学

High-field magnetization measurements of quasi-two大学院理学研究
dimensional magnets based on layered compounds TxMX2 (T = Chishiro Michioka
科
3d-transition metal，M = Ta, Nb, X = S, Se)

Kyoto University
Kyoto University

担当所員：尾崎担当所員：益田135

担当所員：金道

Title

Name

Organization

泰助

〃

隆嗣
自 Evaluation of single crystal quality of non-centrosymmetricsuperconductors

Tohoku University

浩一

136 歪みの少ないカゴメ格子チタンフッ化物の磁性

植田

137

林

138

所属

〃

積層化合物 TxMX2 を基軸とした擬二次元磁性体
道岡の強磁場磁化測定

真弘

〃

139

〃

森山

広大

京都大学

大学院理学研究
科〃

Kodai Moriyama

140

〃

山中

俊介

京都大学

大学院理学研究
科〃

Shunsuke Yamanaka Kyoro University

141

〃

奈良

建佑

京都大学

大学院理学研究科〃

Nara Kensuke

Kyoto University

142

ルテニウムダブルペロブスカイト酸化物におけるスピン軌道励起子磁性の探索

原口祐哉

東京農工大学

大学院工学研究 Search for a spin-orbit excitonic magnetism in ruthenium
double perovskite oxides
院

Yuya Haraguchi

University ofAgriculture andTechnology

143

〃

八束

波椰斗

東京農工大学

工学部

Hayato Yatsuzuka

Tokyo Universityof Agriculture andTechnology

144

重い電子系化合物が示す非従来型超伝導と磁性
の相関

横山

淳

茨城大学

大学院理工学研 Interplay between unconventional superconductivity andmagnetism in heavy-fermion compounds
究科

Makoto Yokoyama

Ibaraki University

〃

No.

課題名

145

〃

氏名

所属

ラフマント

茨城大学

大学院理工学研
究科

146 Bi-2212 単結晶における修正コーラー則の検証

渡辺

孝夫

弘前大学

147

〃

原田

圭市

148

〃

藤井

149

Title
〃

Name

Organization

ISSP Activity Report 2020

83

Rahmanto

Ibaraki University

大学院理工学研 Investigation of the modified Kohler’ s rule on Bi-2212 single
crystals
究科

Takao Watanabe

Hirosaki University

弘前大学

大学院理工学研
究科〃

Keiichi Harada

Hirosaki University

武則

東京大学

低温センター〃Takenori Fujii

University of Tokyo

dimer-Mott 系有機導体における磁場中金属―絶
杉浦
縁体転移

栞理

東北大学

金属材料研究所

Shiori Sugiura

Tohoku University

150

幾何学的フラストレート磁性体の強磁場磁化測
定

菊池

彦光

福井大学

学術研究院工学
Magnetization measurements of the frustrated magnets
系部門

Hikomitsu Kikuchi

University of Fukui

151

強いスピン軌道相互作用を持つ超伝導体における量子振動測定

芝内

孝禎

東京大学

大学院新領域創 Quantum oscillation measurements on superconductors withstrong spin-orbit interaction
成科学研究科Takasada Shibauchi

The University of
Tokyo

152

〃

橋本

顕一郎

東京大学

大学院新領域創成科学研究科〃

Kenichiro Hashimoto

The University of
Tokyo

153

〃

水上

雄太

東京大学

大学院新領域創成科学研究科〃Yuta Mizukami

The University of
Tokyo

154

〃

石田

浩祐

東京大学

大学院新領域創成科学研究科〃

Kousuke Ishida

The University of
Tokyo

155

〃

向笠

清隆

東京大学

大学院新領域創成科学研究科〃Kiyotaka Mukasa

The University of
Tokyo

156

〃

石原

滉大

東京大学

大学院新領域創成科学研究科〃

Kota Ishihara

The University of
Tokyo

157

新奇ウラン系スピン三重項超伝導体及び関連物
質の強磁場物性

清水

悠晴

東北大学

金属材料研究所

High-magnetic field effects on novel spin-triplet uranium
superconductors and related compounds

Yusei Shimizu

Tohoku University

158

topological Kondo insulator SmB6,YbB12 の磁化特性と比熱

伊賀

文俊

茨城大学

理学部

Magnetic and thermal properties of topological Kondo
insulator SmB6 and YbB12

Fumitoshi Iga

Ibaraki University

159

〃

松浦

航

茨城大学

大学院理工学研
究科

Wataru Matsuura

Ibaraki university

160

高圧合成新規希土類 Ce および Pr12 ホウ化物の
強磁場中の磁化と比熱

伊賀

文俊

茨城大学

理学部

161

〃

山田

貴大

茨城大学

大学院理工学研
究科

Field induced M-I transition in dimer-Mott type organic
conductors〃

Magnetic and thermal properties in high magnetic fields of CeFumitoshi Iga
and Pr- dodeca-borides produced by high pressure synthesis〃

Takahiro Yamada

Ibaraki University
Ibaraki University

84
ISSP Activity Report 2020

No.

課題名

162

金属絶縁体転移を持つ Cu(Ir1-xRhx)2S4 の高磁場
電気抵抗

伊藤

昌和

鹿児島大学

総合科学域総合 High magnetic field electric resistivity of Cu(Ir1-xRhx)2S4 withthe metal-insulator transition
教育学系

Masakazu Ito

Kagoshima University

163

〃

鹿島

頌太

鹿児島大学

大学院理工学研
究科〃

Shota Kashima

Kagoshima University

164

〃

今村

有助

鹿児島大学

大学院理工学研
究科〃

Yusuke Imamura

Kagoshima University隆太郎

沖縄科学技術大 量子物質科学ユ High-field magnetization study of itinerant triangular lattice
antiferromagnet GdGaI
学院大学
ニット

Ryutaro Okuma

Okinawa Instituteof Science andTechnology

Electronic states at high magnetic fields in Heavy Fermion
systems

Takao Ebihara

Shizuoka University

Hiroshi Maruyama

Shizuoka University
University of Tokyo

165

氏名

遍歴三角格子反強磁性体 GdGaI の強磁場磁化過
大熊程担当所員：徳永

所属

Title

Name

Organization

将史

166 重い電子系における強磁場中の電子状態研究

海老原

167

〃

丸山

168

磁気光学顕微鏡による超伝導体中の量子渦の実空間非平衡ダイナミクス観測手法の確立

静岡大学

学術院理学領域

博史

静岡大学

大学院総合科学
技術研究科

黒川

穂高

東京大学

大学院総合文化 Observing the real-space nonequilibrium dynamics of vortices
in superconductor with a magneto-optical microscope
研究科

Hodaka Kurokawa

169 (AlxM2-x)GeO5 (M=Cr, V, Fe) の強磁場磁化測定 香取

浩子

東京農工大学

大学院工学研究 High-field magnetization measurements of (AlxM2-x)
GeO5 (M=Cr, V, Fe)院

Hiroko Katori

170

〃

柿本

和勇

東京農工大学工学府〃

Kazuo Kakimoto

171

〃

早川

隆史

東京農工大学

工学部〃

Takashi Hayakawa

Tokyo Universityof Agriculture andTechnology

多層ディラック電子系 BaMnBi2 における量子振酒井
動現象の研究英明

大阪大学

大学院理学研究
Study of quantum oscillation phenomena in BaMnBi2
科

Hideaki Sakai

Osaka University

172

孝雄

〃

Tokyo Universityof Agriculture andTechnology
Tokyo Universityof Agriculture andTechnology

173

〃

近藤

雅起

大阪大学

大学院理学研究科〃

Masaki Kondo

Osaka University

174

〃

阪口

駿也

大阪大学

理学部

〃

Shunya Sakaguchi

Osaka University

175

正四角台塔反強磁性体の強磁場電気磁気特性の
測定

木村

健太

東京大学

大学院新領域創 High-field magnetoelectric properties in square-cupola-based
antiferromagnets
成科学研究科

Kenta Kimura

The University of
Tokyo

176

トーラス型フェルミ面を持つラシュバ型半導体の量子極限伝導特性の研究

村川

寛

大阪大学

大学院理学研究 High field study for quantum limit transport properties of torus
Hiroshi Murakawa
Fermi surface in Rashba semiconductor
科

177

マンガン (III) スピンクロスオーバー錯体における磁気熱量効果

木原

工

東北大学

金属材料研究所

Magnetocaloric effect in manganese(III) spin-crossovercomplex

Takumi Kihara

Osaka university
Tohoku University

No.

課題名

氏名

所属

178

ハニカム格子を含むアクチノイド化合物の強磁
場物性

芳賀

芳範

日本原子力研究 先端基礎研究セ High-field physical properties of uranium compounds having
honeycomb lattice
開発機構
ンター

179

ウラン重い電子系超伝導体・磁性体における強磁場物性測定

清水

悠晴

東北大学

金属材料研究所

180

強磁場磁化過程測定によるペロブスカイト
PbMnO3 の電荷分布解明

東東京工業大学181

近藤絶縁体 YbIr3Si7 の高磁場相における量子振
佐藤
動の検証

雄貴

Title

Name

Organization

Yoshinori Haga

Japan Atomic Energy
AgencyYusei Shimizu

Tohoku University

フロンティア材 Clarification of charge distribution in perovskite PbMnO3 byhigh-field magnetization measurement
料研究所

Masaki Azuma

Tokyo Institute oftechnology

京都大学

大学院理学研究 Quantum oscillation in High field phase of Kondo insulator
YbIr3Si7
科

Sato Yuki

Kyoto University

文俊

茨城大学

理学部

Fumitoshi Iga

Ibaraki University

竹森

氷馬

茨城大学

大学院理工学研
究科

Hyoma Takamoriibaraki university

184

正四角台塔反強磁性体 Pb(TiO)Cu4(PO4)4 におけ木村
る強磁場中での電気磁気光学効果の研究

健太

東京大学

大学院新領域創 Optical magnetoelectric effect of the square-cupola-based
antiferromagnet Pb(TiO)Cu4(PO4)4 in a high magnetic field
成科学研究科

Kenta Kimura

The University of
Tokyo

185

微視的プロｰプによる強磁場誘起電子相の探索と
井原その周辺ダイナミクス観測

慶彦

北海道大学

大学院理学研究 NMR study for magnetic field induced electronic state andtheir dynamics
院

Yoshihiko Ihara

Hokkaido University

福岡

脩平

北海道大学

大学院理学研究院

Shuhei Fukuoka

Hokkaido University

187 次世代レーザーとレーザー加工の基礎技術研究

吉富

大

産業技術総合研 電子光技術研究 Basic research on next generation laser systems and laser
machining technology
究所
部門

Dai YoshitomiNat. Inst. of Advanced
Industrial Science andTechnology

188

〃

高田

英行

産業技術総合研 電子光技術研究
究所
部門

〃

Hideyuki Takada

National Institute ofAdvanced Industrial
Science and Technology

189

〃

奈良崎

産業技術総合研 電子光技術研究
究所
部門

〃

Aiko Narazaki

National Institute ofAdvanced Industrial
Science and Technology

190

〃

鳥塚

健二

産業技術総合研 電子光技術研究
究所
部門

〃

Kenji Torizuka

National Institute ofAdvanced Industrial
Science and Technology

191

〃

田中

真人

産業技術総合研 分析計測標準研
究所
究部門

〃

Masahito Tanaka

National Institute ofAdvanced Industrial
Science and Technology

担当所員：松田
182

正樹

康弘

近藤半導体 (Yb,R)B12、および新規高圧合成物質
伊賀のワンターンコイル 120T 強磁場磁化と伝導

183〃

担当所員：小濱

Magnetization and transport properties by using one-turn coilin a 120 T pulse magnet of Kondo insulator (Yb,R)B12 andnovel rare-earth borides producted by high-pressure synthesis〃

芳允

ISSP Activity Report 2020186
担当所員：小林

High-field properties for uranium heany-fermion
superconductors and magnetic materials

〃

〃

洋平

愛子

85

86
ISSP Activity Report 2020

No.

課題名

氏名

所属

Title

Name

192

〃

小川

博嗣

産業技術総合研 分析計測標準研
究所
究部門

〃

Hiroshi Ogawa

National Institute ofAdvanced Industrial
Science and Technology

193

〃

佐藤

大輔

産業技術総合研 分析計測標準研
究所
究部門

〃

Daisuke Satoh

National Institute ofAdvanced Industrial
Science and Technology

194

〃

澁谷

達則

産業技術総合研 分析計測標準研
究所
究部門

〃

Tatsunori Shibuya

National Institute ofAdvanced Industrial
Science and Technology

195

〃

黒田

隆之助

産業技術総合研究所〃

Ryunosuke Kuroda

National Institute ofAdvanced Industrial
Science and Technology

196

〃

盛合

靖章

産業技術総合研究所〃

Yasuaki Moriai

National Institute ofAdvanced Industrial
Science and Technology〃

Eichi Terasawa

National Institute ofAdvanced Industrial
Science and Technology〃

Daiki Ushikubo

National Institute ofAdvanced Industrial
Science and Technology

先端オペランド計測
技術オープンイノベ
ーションラボラトリ
先端オペランド計測
技術オープンイノベ
ーションラボラトリ
先端オペランド計測

Organization

197

〃

寺澤 英知

産業技術総合研
究所

198

〃

牛窪

大樹

産業技術総合研究所

199

青色半導体レーザー用ファイバ型光コンバイナ
の開発

藤本

靖

千葉工業大学

工学部

200

ワイドバンドギャップ半導体への赤外パルスレ
ーザー加工

富田

卓朗

徳島大学

大学院社会産業 Infrared pulsed laser processing on wide bandgap
semiconductors
理工学研究部

Takuro Tomita

Tokushima University

201

〃

岡田

達也

徳島大学

大学院社会産業
理工学研究部

Tatsuya Okada

Tokushima University

森山

匡洋

東京大学

大学院理学系研究科付属フォトンサ
イエンス研究機構

Masahiro Moriyama

The University of
Tokyo

山口

誠

秋田大学

大学院理工学研 Study on laser modification by using optical spectroscopic
measurements
究科

Makoto Yamaguchi

Akita University

小林

正起

東京大学

大学院工学系研 Observation of the Fermi surface of the interface state between
Masaki Kobayashi
topological insulator Bi and perpendicular magnet MnGa
究科

The University ofTokyo

202 短波長パルスレーザーによる CFRP 加工
203

分光分析によるレーザー加工プロセス解明に関する研究担当所員：原田204

ーションラボラトリ
先端オペランド計測
技術オープンイノベ
ーションラボラトリ

Development on fiber power combiner for GaN semiconductor
Yasushi Fujimoto
lasers〃
CFRP processing with short wavelength pulsed laser

Chiba Institute ofTechnology (CIT)

慈久トポロジカル絶縁体 Bi/ 垂直磁化膜 MnGa 界面におけるゾーン境界における Fermi 面の観測担当所員：板谷

技術オープンイノベ

治郎

205

時間分解非線形分光法を用いたハライド薄膜のコヒーレントフォノンの検出

牧野

哲征

福井大学

学術研究院工学 Coherent phonons of oxyhalide thin films studied by timeresolved nonlinear spectroscopy
系部門

Takayuki Makino

University of Fukui

206

〃

山口

拓真

福井大学

大学院工学研究
科

Takuma Yamaguchi

University of Fukui

〃

No.

課題名

207

〃

担当所員：近藤

氏名鈴木

大学院工学研究
科

Title

健

福井大学

光平

Electronic states of new van der Waals magnetic compound
沖縄科学技術大 量子物質科学ユGdGaI studied by laser angle-resolved photoemission
学院大学
ニット
spectroscopy

〃

Name

Organization

Ken Suzuki

University of Fukui

Kohei Yamagami

Okinawa Instituteof Science andTechnology

猛レーザー角度分解光電子分光を用いた新規ファ
208 ンデルワールス磁性化合物 GdGaI の微細電子状 山神
態観測担当所員：岡﨑所属

浩三

高分解能レーザー励起光電子顕微鏡を用いた鉄209 系超伝導体の電子ネマティック状態の実空間観
察 II

橋本

顕一郎

東京大学

Real-space observation of electronic nematicity in iron大学院新領域創based superconductors by using a high-resolution laser
成科学研究科
photoemission electron microscope II

Kenichiro Hashimoto

The University of
Tokyo

210

〃

水上

雄太

東京大学

大学院新領域創成科学研究科〃Yuta Mizukami

The University of
Tokyo

211

〃

石田

浩祐

東京大学

大学院新領域創成科学研究科〃

Kousuke Ishida

The University of
Tokyo

212

〃

影山

遥一

立命館大学

理工学部

〃

Yoichi Kageyama

Ritsumeikan
University

励起子絶縁体 Ta2NiSe5 及びモット絶縁体
213 Ca2RuO4 における光誘起絶縁体 - 金属転移の研究

久保田

214 励起子絶縁体における光誘起半金属相の研究

溝川

雄也
貴司

ISSP Activity Report 2020

215

T’ 構造をもつ銅酸化物高温超伝導体の角度分解
光電子分光による研究

チャン
イル

216

時間分解角度分解光電子分光による電荷密度波
物質 VTe2 のトポロジカル表面状態の観測

三石

ウェ

夏樹

放射光科学研究 XFEL 研究開発
センター
部門

Investigation of the photo-induced insulator-to-metal transition
Yuya Kubota
in an exitonic insulator Ta2NiSe5 and a Mott insulator Ca2RuO4Japan Synchrotron
Radiation ResearchInstitute (JASRI)

早稲田大学

理工学術院先進
Photoinduced semimetallic phases in excitonic insulators
理工学部

Takashi Mizokawa

Waseda University

上智大学

機能創造理工学 Photoemission spectroscopy of electron-doped T’ -cuprate
superconductors
科

Zhang Weilu

Sophia University

東京大学

Observation of topological surface states in charge density
大学院工学系研wave material VTe2 by time- and angle-resolved photoemission Natsuki Mitsuishi
究科
spectroscopy

The University ofTokyo

一般研究員・大阪大学 先端強磁場科学研究センター / General Researcher・Center for Advanced High Magnetic Field Science Osaka University
No.

課題名

氏名

87

1

Fe-Ni 系合金におけるマルテンサイト変態の時間
福田
依存性

2

磁気力の半径方向成分によるタンパク質結晶の磁気浮上と熱物性値計測

牧3

均一粒径クロミック化合物における強磁場物性

浅野

隆
祥
貴行

所属

Title

Name

大阪大学

大学院工学研究 Time dependence of martensitic transformation in Fe-Ni based
Takashi Fukuda
alloys科

大阪大谷大学

薬学部

福井大学

学術研究院工学 Magnetic properties under high magnetic field in chromic
compounds with a uniform particle size
系部門

Magnetic levitation and thermal property measurement ofprotein crystallization by the use of the radial component ofmagnetic force

Organization
Osaka University

Syou Maki

Osaka Ohtani
University

Takayuki Asano

University of Fukui

88
ISSP Activity Report 2020

No.

課題名

4

〃

氏名

所属

西首

時夫

福井大学

大学院工学研究
科

Title
〃

Name

Organization

Tokio Nishikubi

University of Fukui

5

量子スピン系の電場励起 ESR と方向二色性

木村

尚次郎

東北大学

金属材料研究所

Electric dipole spin resonance and directional dichroism of the
Shojiro Kimura
quantum spin systems

Tohoku University

6

ホイスラー合金 Ni2MnX(X = In, Al, Sn, Sb) 系の磁化・超磁歪ならびに高速磁場応答性の研究

左近

拓男

龍谷大学

理工学部

Research on time dependences of magnetstriction of Ni2MnX(X
Takuo Sakon= In, Al, Sn, Sb) type and Pd2MnSn type Heusler alloys

Ryukoku University7

層状反強磁性体 EuIn2As2 の磁気特性の解明

酒井

英明

大阪大学

大学院理学研究 Study of the magnetic properties for layered antiferromagnet
EuIn2As2
科

Hideaki Sakai

Osaka University

雅起

大阪大学

大学院理学研究科〃

Masaki Kondo

Osaka University

大阪大学

大学院理学研究
科〃

Ryusei Maeshiro

Osaka University〃

Shunya Sakaguchi

Osaka University

8

〃

近藤

9

〃

真栄城

10

〃

阪口

駿也

大阪大学

理学部

村川

寛

大阪大学

大学院理学研究
High-magnetic-field studies of the rare-earth Weyl materials
科

Hiroshi Murakawa

Osaka University

Yudai Nakaoka

Osaka University

11

希土類ワイル物質の強磁場下輸送特性の研究

竜生

12

〃

中岡

優大

大阪大学

大学院理学研究科

13

パルス強磁場を用いた圧力下 ESR 装置における渦電流軽減の検討

櫻井

敬博

神戸大学

研究基盤センタ Investigation of eddy current reduction in high pressure ESR
system using pulsed high magnetic fieldーTakahiro Sakurai

Kobe University

14

正四角台塔反強磁性体の強磁場 ESR

木村

健太

東京大学

大学院新領域創 High-field ESR measurements of square-cupola-based
antiferromagnets
成科学研究科

Kenta Kimura

The University of
Tokyo

15

CaBa(Co1-xFex)4O7 (0 ≤ x ≤ 1) 単結晶試料の強磁場下での磁化・電気分極・ESR 測定

桑原

英樹

上智大学

理工学部

16

〃

白崎

巧

上智大学

理工学部

17

ハルデン磁性体のバルクーエッジ相関に関する
研究

柏木

隆成

筑波大学

数理物質系

18

強いスピン - 軌道相互作用を活かした酸化物スピ
松野
ントロニクス

丈夫

大阪大学

19

カルボン酸、スルホン酸を架橋配位子とした金属錯体の構造と磁性に関する研究

本多

善太郎

20

バックルドハニカム格子反強磁性体 Cs3Fe2Cl9の強磁場下 ESR 測定

吉田

紘行

〃

Magnetization, electric polarization, and ESR measurements
for CaBa(Co1-xFex)4O7 (0 ≤ x ≤ 1) single crystals in pulsed high Hideki Kuwaharamagnetic fields〃

Sophia University

Takumi Shirasaki

Sophia University

Takanari Kashiwagi

Univ. of Tsukuba

大学院理学研究
Oxide spintronics utilizing strong spin-orbit coupling科

Jobu Matsuno

Osaka University

埼玉大学

大学院理工学研 Crystal structures and magnetic properties of carboxylate,sulfonate-bridged transition metal complexes
究科

Zentaro Honda

Saitama University

北海道大学

大学院理学研究 High-field ESR measurements on buckled honeycomb lattice
antiferromagnets Cs3Fe2Cl9
院

Hiroyuki Yoshida

Hokkaido University

Study of bulk-edge interaction of Haldane magnets

No.

課題名

21

SmB6/SrB6/CaB6 人工超格子の強磁場中ホール
効果測定

宍戸

寛明

大阪府立大学

大学院工学研究 Hall resistance measurements for SmB6/SrB6/CaB6 superlattices
Hiroaki Shishido
under high magnetic field科

Osaka Prefecture
University22三角格子磁性体の強磁場 ESR

南部

雄亮

東北大学

金属材料研究所

ESR measurements under high magnetic fields on a triangularmagnetYusuke Nambu

Tohoku University

23

フェルダジル系塩から成る量子スピン系の強磁
場磁性

山口

博則

大阪府立大学

大学院理学系研 High-field magnetic properties of quantum spin systems
composed of verdazyl-based salts
究科

Hironori Yamaguchi

Osaka Prefecture
University

24

ナノ構造を導入した希土類系高温超伝導薄膜における強磁場中臨界電流密度に関する研究

土屋

雄司

名古屋大学

工学部

Yuji Tsuchiya

Nagoya University

25

ディラック電子系 NiTe2 と Pd 置換系の磁化測定
宮坂による量子振動の研究

茂樹

大阪大学

大学院理学研究 Quantum oscillation in Dirac fermion system, NiT2 and Pddoping systems via magnetization measurement
科

Shigeki Miyasaka

Osaka University

26

微視的プロｰプによる強磁場誘起電子相の探索と
井原その周辺ダイナミクス観測

慶彦

北海道大学

大学院理学研究 NMR study for magnetic field induced electronic state andtheir dynamics
院

Yoshihiko Ihara

Hokkaido University

脩平

北海道大学

大学院理学研究科

Shuhei Fukuoka

Hokkaido University

27

〃

氏名

福岡

所属

Title

Study on the critical current density in high-magnetic field in
RE-based cuprate superconductors with nano-structure

〃

Name

Organization

物質合成・評価設備 G クラス / Materials Synthesis and Characterization G Class Researcher
No.

課題名

氏名

所属

Title

Name

Organization

ISSP Activity Report 2020

1

FZ 法での四ほう酸ストロンチウム (SrB4O7) 結晶
小松の育成と評価隆一

山口大学

大学院理工学研 Growth and characterization of strontium tetraborate crystal
by the floating zone method
究科

Ryuichi Komatsu

Yamaguchi University2

超臨界メタノール条件下でのエステル交換反応に固体触媒が与える影響

秋月

信

東京大学

大学院新領域創 The effect of solid catalysts on the ester exchange reaction insupercritical methanol
成科学研究科

Makoto Akizuki

The University of
Tokyo

3

〃

張

瑞子

東京大学

大学院新領域創成科学研究科

Zhang Ruizi

The University of
Tokyo

4

高温高圧水における析出炭素の除去による固体
触媒再生の検討

秋月

信

東京大学

大学院新領域創 Examination of solid catalyst regeneration by removing
precipitated carbon in sub- and supercritical water
成科学研究科

Makoto Akizuki

The University of
Tokyo

5

〃

チン
イ

ブンセ

東京大学

大学院新領域創成科学研究科Chen Wenjing

The university of
Tokyo

信

東京大学

大学院新領域創 Investigation of the effect of hot compressed methanol-water
mixed solvent on solid catalyzed reactions
成科学研究科

Makoto Akizuki

The University ofTokyo

Ayako Shimada

The university of
Tokyo

6

高温高圧条件下の水 - メタノール溶媒が固体触媒
秋月反応に及ぼす影響

89

7

〃

島田

綾子

東京大学

大学院新領域創成科学研究科8

単結晶 CaMn1-xSbxO3 の誘電特性および磁気特
性の研究

谷口

晴香

岩手大学

理工学部

〃

〃

〃

Study of dielectric and magnetic properties of single crystalline
Haruka Taniguchi
CaMn1-xSbxO3

Iwate University

90
ISSP Activity Report 2020

No.

課題名

氏名

所属

9

数値計算を用いた泥岩中の化学的浸透現象に伴う歪についての検討

廣田

翔伍

東京大学

大学院新領域創 Numerical investigation of rock deformation caused bychemical osmosis in mudstones
成科学研究科10

黒鉛層間金属微粒子の TEM 観察

白井

誠之

岩手大学

理工学部

Title

Name

Organization

Shogo Hirota

The University ofTokyo

Masayuki Shirai

Iwate University〃

Mika Sodeno

Iwate University

Study of new rare-earth magnets

Tetsuji Saito

Chiba Institute ofTechnology

TEM observation of metal particles intercalated between
graphite layers

11

〃

袖野

美果

岩手大学

大学院総合科学研究科

12

新規希土類磁石の構造解析

齋藤哲治

千葉工業大学

工学部

13

ナノ構造材料を用いたクリーンエネルギーデバ
イス開発

細野

英司

産業技術総合研 省エネルギー研 Development of clean energy devices by using nanostructured
Eiji Hosono
materials
究所
究部門

National Institute ofAdvanced Industrial
Science and Technology

14

〃

太田

道広

産業技術総合研 省エネルギー研
究所
究部門

〃

Michihiro Ohta

National Institute ofAdvanced Industrial
Science and Technology

15

〃

プリヤンカ
ジュド

産業技術総合研 省エネルギー研
究所
究部門

〃

Priyanka Jood

National Institute ofAdvanced Industrial
Science and Technology

16

マイクロミキサを用いた機能性無機ナノ粒子の連続合成

陶

産業技術総合研 化学プロセス研 Continuous synthesis of functional inorganic nanoparticles
using a micromixer
究所
究部門

Sue Kiwamu

National Institute ofAdvanced Industrial
Science and Technology

17

高圧下におけるオリビン高圧相間の同位体分配
実験

佐野

亜沙美

日本原子力研究 J-PARC センタ
開発機構
ーAsami Sano

JAEA

18

misfit 単結晶の構造観察

小林

夏野

岡山大学

異分野基礎科学
Observation of local structure on misfit single crystal
研究所

Kaya Kobayashi

Okayama University

19(Pr, Nd, Sm)0.5Sr0.5FeO3 の高温における磁性と中津川
熱電特性に関する研究

博

横浜国立大学

大学院工学研究 Magnetism and thermoelectric properties at high temperaturein (Pr, Nd, Sm)0.5Sr0.5FeO3院

Hiroshi Nakatsugawa

Yokohama National
University

20

キタエフ相互作用をもつ三角格子磁性体の磁気
特性評価

原口

祐哉

東京農工大学

大学院工学研究 Investigation of magnetism of triangular lattice magnets with
Kitaev interaction
院

Yuya Haraguchi

Tokyo Universityof Agriculture andTechnology

21

〃

大野田

東京農工大学

大学院工学研究院

Takehiro Ohnoda

22

ペロブスカイト型 Ni 酸化物における Ni 価数と磁性との関係香取

浩子

東京農工大学

大学院工学研究 Relationship between Ni valence and magnetism in perovskiteHiroko Katori
type Ni oxides
院

23

〃

柿本

和勇

東京農工大学工学府〃

Kazuo Kakimoto

24

〃

早川

隆史

東京農工大学

工学部〃

Takashi Hayakawa

Tokyo Universityof Agriculture andTechnology

25

ハーフメタルホイスラー合金の遍歴電子強磁性体のスピンゆらぎ理論による解析に関する研究

重田

出

鹿児島大学

大学院理工学研 Study on analysis of half-metallic Heusler alloys by the spin
fluctuation theory of itinerant electron ferromagnets
究科

Iduru Shigeta

Kagoshima University

究豪宏

Isotope partitioning experiment on olivine and its highpressure polymorph〃

Tokyo Universityof Agriculture andTechnology

Tokyo Universityof Agriculture andTechnology

Tokyo Universityof Agriculture andTechnology

No.

課題名

26

〃

氏名

所属

横山

喬亮

鹿児島大学

理学部

Title

Name

Organization〃

Takaaki Yokoyama

Kagoshima University

Shintaro Suzuki

Tokyo University of
Science27

準結晶・近似結晶の磁性に関する研究 IV

鈴木

慎太郎

東京理科大学

基礎工学部

28

有機伝導体の磁化測定によるモット物理の研究

宮川

和也

東京大学

大学院工学系研 Study of Mott physics by magnetization measurements oforganic conductors
究科

Kazuya Miyagawa

The University of
Tokyo

29

ホイスラー化合物での反強磁性の研究

廣井

政彦

鹿児島大学

大学院理工学研
Study on antiferromagnetism in Heusler compounds
究科

Masahiko Hiroi

Kagoshima University

Kouki Akaishi

Kagoshima University

Magnetism of quasicrystal and approximants IV

ISSP Activity Report 2020

30

〃

赤石

幸起

鹿児島大学

理学部

31

κ型有機導体における交流磁化率測定によるモット型超伝導ー反強磁性絶縁体相境界の研究

谷口

弘三

埼玉大学

Studies on Mott-type superconductor-antiferromagnetic
大学院理工学研
insulator phase boundary by AC susceptibility measurements
究科
in k-type organic conductors

Hiromi Taniguchi

Saitama University

32

〃

高橋

啓太

埼玉大学

理学部

Keita Takahashi

Saitama University

33

重希土類元素を含む充填スクッテルダイト化合物の新物質探索関根

ちひろ

室蘭工業大学

大学院工学研究 Search for new flled-skutterudite compounds including heavy
rare-earth metal科

Chihiro Sekine

Muroran Instiute ofTechnology

34

〃

上野

公輔

室蘭工業大学

大学院工学研究
科

Kosuke Ueno

Muroran Instiute ofTechnology

35

酸窒化物蛍光体の超高圧力合成と結晶構造，発
光特性評価

佐々木

名古屋大学

大学院工学研究 High-pressure synthesis, crystal structure, andphotoluminescence properties of oxynitride phosphors科

Takuya Sasaki

Nagoya University

36

〃

近藤

名古屋大学

大学院工学研究
科

Shinsuke Kondo

Nagoya University37

圧力誘起構造相転移を利用した酸化物蛍光体の合成と発光制御

佐々木

名古屋大学

High-pressure synthesis and photoluminescence control of
大学院工学研究
oxide-system phosphors by pressure-induced structural phase科
transition

Takuya Sasaki

Nagoya University

38

〃

立岩

一晃

名古屋大学

工学部

Kazuaki Tateiwa

Nagoya University

丹羽

健

名古屋大学

大学院工学研究 High-pressure synthesis and physical properties of novel
intermetallic compounds
科

Ken Niwa

Nagoya University

Koichi Takano

Nagoya University

39

新規金属間化合物の高圧合成と物性

拓也
信介
拓也

〃

〃

〃

〃

〃

91

40

〃

高野

航一

名古屋大学

大学院工学研究科

41

塩化アンモニウムおよび直接窒化による遷移金
属窒化物の高圧合成

丹羽

健

名古屋大学

大学院工学研究 High-pressure synthesis of transition metal nitrides via
Ken Niwa
nitridation of using ammonium chloride or molecular nitrogen
科

Nagoya University

42

〃

浅野

秀斗

名古屋大学

大学院工学研究
科

Nagoya University〃〃

Shuto Asano

92

No.

課題名

氏名

所属

ISSP Activity Report 202043

高圧下における TaN ナノワイヤー結晶の合成

ニコ アレキサ名古屋大学
ンダー ガイダ

工学部

44

高圧下でのアミノ酸のペプチド化反応と不斉増
幅

鍵

東京大学

45

〃

織田

翔太郎

46

Name

Organization

Nico Alexander
Gaida

Nagoya University

大学院理学系研 Peptide formation and chiral amplification of amino acids
under high pressure
究科

Hiroyuki Kagi

The University of
Tokyo

東京大学

大学院理学系研
究科

Shotaro Oda

The University of
Tokyo

理子

東京大学

大学院理学系研
Neutron diffraction measurements on hydrogenated iron-nickel
Riko Iizuka
究科地殻化学実
alloy at high-PT conditions
験施設

The University ofTokyo

Chikara Shito

The University of
Tokyo

裕之

高温高圧中性子回折測定を用いた鉄−ニッケル合飯塚
金中の水素原子のサイト依存性の解明

Title
Synthesis of TaN nanowire crystals under high pressure

〃

47

〃

市東

力

東京大学

大学院理学系研
究科

48

高温高圧下における下部マントル鉱物への窒素の取り込みに関する研究

福山

鴻

東京大学

大学院理学系研
The study on nitrogen incorporation into the lower-mantle
究科 地殻化学
minerals under high pressure and high temperature
実験施設

Ko Fukuyama

The University of
Tokyo

49

ぺロブスカイト関連化合物の高圧合成

稲熊

宜之

学習院大学

理学部

Yoshiyuki Inaguma

Gakushuin University〃

High-pressure synthesis of perovskite-related compounds

50

〃

植田

紘一郎

学習院大学

理学部

〃

Koichiro Ueda

Gakushuin University

51

〃

和泉

一成

学習院大学

大学院自然科学研究科〃

Kazunari Izumi

Gakushuin University

52

高温高圧水中でのバイオマス変換に使用するマイクロポーラス材料の安定性向上

大島

義人

東京大学

大学院新領域創 Improving stability of microporous materials for biomass
upgrading in sub- and supercritical water
成科学研究科Yoshito Oshima

The University of
Tokyo

53

〃

東京大学

大学院新領域創成科学研究科Apibanboriak
Chanwit

The University of
Tokyo

54

高脂質含有バイオマスの超臨界水ガス化における水素生産のための 2 段階接触分解装置と改質
装 置の開発アピバンボリラク チャン
ウィット
布浦

東京大学

Development of a two-stage catalytic cracker and reformer
環境安全研究セ
for hydrogen production in supercritical water gasification ofンター
biomass with high lipid content

Teppei Nunoura

The University of
Tokyo

55

〃

東京大学

大学院新領域創成科学研究科

Diane Gubatanga

The University of
Tokyo

56

加圧熱水処理によるコーヒー滓からの吸着材製
造

布浦

東京大学

環境安全研究セ Coffee-based adsorbents production via hydrothermal
carbonization
ンター

Teppei Nunoura

The University of
Tokyo

57

〃

秦

世明

東京大学

大学院新領域創成科学研究科Qin Shiming

The University of
Tokyo

58

超臨界二酸化炭素、塩水、岩石間の相互作用が起きる場の基礎的理解

秋月

信

東京大学

大学院新領域創 Research on fundamentals of interaction between supercritical
Makoto Akizuki
carbon dioxide, brine and rock
成科学研究科The University of
Tokyo

59

〃

外野

圭太

東京大学

大学院新領域創成科学研究科The University of
Tokyo

鉄兵

ダイアン
バタンガ
鉄兵

グ

〃

〃

〃

〃

Keita Hokano

ISSP Activity Report 2020

No.

課題名

60

プロトン伝導性固体電解質膜の異相接合界面における輸送現象の研究

大友

順一郎

東京大学

大学院新領域創 Study of the transport phenomenon at proton conductor’ sheterojunction
成科学研究科

Junichiro Otomo

The University of
Tokyo

61

〃

中根

健太

東京大学

工学部

Nakane Kenta

The University of
Tokyo

62

プロトン伝導性固体電解質薄膜を用いた低温作
動燃料電池・電解合成セルの開発

大友

順一郎

東京大学

Development of low-temperature solid oxide fuel cells and
大学院新領域創electrolysis cells using proton-conducting solid electrolyte thin Junichiro Otomo
成科学研究科films

The University of
Tokyo

63

〃

松尾

拓紀

東京大学

大学院新領域創成科学研究科The University of
Tokyo

64

カルシウムループ法によるメタンガスプロセス
の開発

大友

順一郎

東京大学

大学院新領域創
Development of Ca looping process for production of methane Junichiro Otomo
成科学研究科The University of
Tokyo

65

〃

李

東京大学

大学院新領域創成科学研究科Lee Jihan

The University of
Tokyo

66

中温域でのアンモニア電解合成における赤外分
光法を用いた反応機構解明

大友

順一郎

東京大学

Elucidation of reaction mechanism of ammonia
大学院新領域創electrosynthesis at intermediate temperature with infrared
成科学研究科
spectroscopy

Junichiro Otomo

The University of
Tokyo

67

〃

秋山

大樹

東京大学

大学院新領域創成科学研究科Daiki Akiyama

The University of
Tokyo

68

ケミカルループ燃焼法における酸素放出型キャ
リアの構造制御

大友

順一郎

東京大学

大学院新領域創 Structure control of oxygen carrier materials in chemicallooping systems
成科学研究科

Junichiro Otomo

The University of
Tokyo

69

〃

山村 泰平

東京大学

大学院新領域創成科学研究科

Taihei Yamamura

The University of
Tokyo

大友

順一郎

東京大学

大学院新領域創
Reactor design for ammonia electrosynthesis
成科学研究科

Junichiro Otomo

The University ofTokyo

Kazutaka Fukuda

The University of
Tokyo

70

アンモニア電解合成の反応器設計

氏名

智漢

所属

Title

〃

〃

〃

〃

〃

Name

Hiroki Matsuo

Organization

93

71

〃

福田

一峻

東京大学

大学院新領域創成科学研究科72

混合電解質を用いたセルによる輸送特性制御と電解合成への応用

大友

順一郎

東京大学

大学院新領域創 Transport property control by mixed electrolyte cell and its
application to electrosynthesis
成科学研究科

Junichiro Otomo

The University of
Tokyo

73

〃

田島

星也

東京大学

大学院新領域創成科学研究科

Seiya Tajima

The University of
Tokyo

74

CSD 法によるプロトン伝導性電解質薄膜の低温合成およびセル性能評価

大友

順一郎

東京大学

大学院新領域創 Low temperature synthesis of electrolyte thin film by CSD
method and evaluation of cell performance
成科学研究科

Junichiro Otomo

The University of
Tokyo

75

〃

戸田

亮輔

東京大学

大学院新領域創成科学研究科

Ryousuke Toda

The University of
Tokyo

76

燃料電池の電解質・電極の異相界面の解析と燃料電池の性能向上

大友

順一郎

東京大学

大学院新領域創 Analysis of heterogeneous interface of electrolyte andelectrode, and improvement of SOFC
成科学研究科

Junichiro Otomo

The University of
Tokyo

〃

〃

〃

94
ISSP Activity Report 2020

No.

課題名

氏名

77

〃

黄

78

イオン及び電子伝導特性の制御による SOEC 性
能の改善

大友

79

〃

80

所属
東京大学

大学院新領域創成科学研究科

順一郎

東京大学

オルティスコ
ラレスフリアンアンドレス

イオンー電子混合伝導体の異相界面の作製と輸送現象の解明

大友

81

〃

甚野

82

メソポーラスマテリアルに担持した金属触媒のキャラクタリゼーション

佐々木

83

廃プラスチックの炭化による二酸化炭素回収お
よび貯留

布浦

84

〃

85

Title

Name

Organization

Huang Rui

The University ofTokyo

大学院新領域創 Improvement of solid-oxide electrolysis cells performance bycontrolling ionic and electronic transport properties
成科学研究科

Junichiro Otomo

The University of
Tokyo

東京大学

大学院新領域創成科学研究科Ortiz Corrales Julian The University ofAndres
Tokyo

順一郎

東京大学

大学院新領域創 Formation of heterojunction of mixed ionic electronic
conductors and clarification of its transport phenomena
成科学研究科

Junichiro Otomo

The University of
Tokyo

幸一

東京大学

大学院新領域創成科学研究科

Koichi Jinno

The University of
Tokyo

東京大学

大学院新領域創 Characterization of metal catalysts loaded on mesoporous
materials
成科学研究科

Takehiko Sasaki

The University of
Tokyo

東京大学

環境安全研究セ
Carbon capture through carbonization of plastic waste
ンター

Teppei Nunoura

The University ofTokyo

ジェニファー
チャー ウィ
ー ファン

東京大学

大学院新領域創成科学研究科Jennifer Chia Wee
Fern

The University ofTokyo

二価の鉄イオンを含む六方晶フェライトの化学組成と磁気特性

植田

浩明

京都大学

大学院理学研究 Chemical compositions and magnetic properties of hexaferrites
Hiroaki Ueda
with ferrous ion
科

Kyoto university

86

〃

奥津

陽太

京都大学

大学院理学研究
科

Yota Okutsu

Kyoto University

87

新規パイロクロア格子反強磁性体の磁気的性質

岡本

佳比古

名古屋大学

大学院工学研究 Magnetic properties of a novel pyrochlore lattice
antiferromagnet
科

Yoshihiko Okamoto

Nagoya University

88

新規遷移金属窒化物の超高圧合成と結晶育成お
よび物性

長谷川

正

名古屋大学

大学院工学研究 High pressure synthesis, crystal growth and physical properties
Masashi Hasegawa
of novel transition metal nitrides
科

Nagoya University

89

〃

野田

航希

名古屋大学

工学部

Nagoya University

90

サマリウム系希土類オルソフェライト単結晶成
長とテラヘルツ帯スピン分光

中嶋

誠

大阪大学

レーザー科学研 Single crystal growth for Samarium rare-earth orthoferrite and
Makoto Nakajima
ultrafast terahertz spin control
究所

Osaka University

91

〃

北原

英明

大阪大学

レーザー科学研究所〃

Hideaki Kitahara

Osaka University

92

〃

小池

遥平

大阪大学

レーザー科学研究所〃

Yohei Koike

Osaka University

93

〃

凌

大阪大学

レーザー科学研
究所〃

Ling Ziqi

Osaka University

睿

岳彦
鉄兵

子祺

〃

〃

〃

〃

〃

〃

Koki Noda

No.

課題名

氏名

所属

94

〃

遠矢

雄浩

大阪大学

レーザー科学研究所

95

フェロイック物質に係る物質開発・新規な物性
現象の探求

木村

剛

東京大学

96

〃

木村 健太

97

〃

三澤

98

〃

99

ISSP Activity Report 2020

95

Title

Name

Organization〃

Toya Kazuhiro

Osaka university

大学院新領域創
Exploration of novel ferroic materials and phenomena
成科学研究科Tsuyoshi Kimura

The University of
Tokyo

東京大学

大学院新領域創成科学研究科〃

Kenta Kimura

The University of
Tokyo

龍介

東京大学

大学院新領域創成科学研究科〃

Ryusuke Misawa

The University of
Tokyo

林田

健志

東京大学

大学院新領域創成科学研究科〃

Takeshi Hayashida

The University of
Tokyo

〃

八木

直輝

東京大学

大学院新領域創成科学研究科〃

Naoki Yagi

The University of
Tokyo

100

〃

姜

山

東京大学

大学院新領域創成科学研究科〃

Kang SanThe University of
Tokyo

101

〃

林

悠生

東京大学

大学院新領域創成科学研究科〃Yuki Hayashi

The University of
Tokyo

102

〃

大島

貴彦

東京大学

大学院新領域創成科学研究科〃Takahiko Oshima

The University of
Tokyo

103

回転対称性の破れを伴う超伝導体・磁性体に関
する研究

水上

雄太

東京大学

大学院新領域創 Studies on superconductors and magnetic materials withrotational symmetry breaking
成科学研究科Yuta Mizukami

The University of
Tokyo

104

〃

石田

浩祐

東京大学

大学院新領域創成科学研究科〃

Kousuke Ishida

The University of
Tokyo

105

〃

向笠

清隆

東京大学

大学院新領域創成科学研究科〃Kiyotaka Mukasa

The University of
Tokyo

106

〃

田中

桜平

東京大学

大学院新領域創成科学研究科〃

Ohei Tanaka

The University of
Tokyo

107

〃

石原

滉大

東京大学

大学院新領域創成科学研究科〃

Kota Ishihara

The University of
Tokyo

108

〃

斎藤

三樹彦

東京大学

大学院新領域創成科学研究科〃Mikihiko Saito

The University of
Tokyo

109

〃

原澤

龍平

東京大学

工学部

〃

Ryuhei Harasawa

The University of
Tokyo

有馬

孝尚

東京大学

大学院新領域創 Exploration of materials hosting controllable magnetic
superstructure
成科学研究科Takahisa Arima

The University ofTokyo

110 外場制御可能な磁気超構造を有する物質の開発

96
ISSP Activity Report 2020

No.

課題名

氏名

111

〃

徳永

祐介

東京大学

大学院新領域創成科学研究科〃

Yusuke Tokunaga

The University of
Tokyo

112

〃

阿部

伸行

東京大学

大学院新領域創成科学研究科〃Nobuyuki Abe

The University of
Tokyo

113

〃

近江

毅志

東京大学

大学院新領域創成科学研究科〃Omi Tsuyoshi

The University of
Tokyo

114

〃

荒木

勇介

東京大学

大学院新領域創成科学研究科〃Araki Yusuke

The University of
Tokyo

115

〃

佐藤

樹

東京大学

大学院新領域創成科学研究科〃Tatsuki SatoThe University of
Tokyo

116

〃

渡辺

義人

東京大学

大学院新領域創成科学研究科〃Yoshito Watanabe

The University of
Tokyo

117

〃

蘇

東京大学

大学院新領域創成科学研究科〃Su DanThe University of
Tokyo

118

〃

柳内

晃

東京大学

大学院新領域創成科学研究科〃

Hikaru Yagiuchi

The University of
Tokyo

119

〃

磯貝

レオナ

東京大学

大学院新領域創成科学研究科〃Leona Isogai

The University of
Tokyo

120

〃

吉田

健斗

東京大学

大学院新領域創成科学研究科〃

Kento Yoshida

The University of
Tokyo

121

バナジウムカルコゲナイドにおける柔粘性結晶
状態の研究

片山

尚幸

名古屋大学

大学院工学研究
Study of plastic crystal state in vanadium chalcogenides
科

Naoyuki Katayama

Nagoya University

122

〃

小島

慶太

名古屋大学

大学院応用物理学専攻

Keita Kojima

Nagoya University

123

バルク材料に負の圧力をかける新しい圧力技術
の開発

片山

尚幸

名古屋大学

大学院工学研究 Development of novel pressure technique which enables toapply negative pressure on bulk materials
科

Naoyuki Katayama

Nagoya University

124

〃

塩見

学

名古屋大学

工学部

Manabu Shiomi

Nagoya University

洋一

岡山理科大学

理学部

Yoichi Tanabe

Okayama University of
Science

東京大学

大学院理学系研 Neutron diffraction measurements on hydrogenated iron-nickel
Yuichiro Mori
alloy at high-PT conditions
究科

The University of
Tokyo

東京大学

大学院新領域創 Exploration of materials hosting controllable magnetic
superstructure
成科学研究科The University of
Tokyo

125

3 次元トポロジカル絶縁体薄膜とグラフェンによ田邉
るヘテロ構造デバイスの物性

126

高温高圧中性子回折測定を用いた鉄−ニッケル合森
金中の水素原子のサイト依存性の解明

丹127 外場制御可能な磁気超構造を有する物質の開発

柳田

悠一郎
真佑

所属

Title

〃

〃
Physical properties of 3D topological insulator thin film /graphene heterostructure device

Name

Shinsuke Yanagida

Organization

No.

課題名

128

〃

氏名
車地

崇

所属
東京大学

Title

大学院新領域創成科学研究科〃Name
Takashi Kurumaji

Organization
The University ofTokyo

物質合成・評価設備 U クラス / Materials Synthesis and Characterization U Class Researcher
No.

課題名

氏名

所属

1

プラズマ風洞による宇宙往還機熱防護システムの動的酸化に関する研究

田中

聖也

東京大学

2

スピングラス物質の合成

古府

麻衣子

日本原子力研究 J-PARC センタ
開発機構
ー

Title

大学院工学系研 Investigation on dynamic oxidation of thermal protection
system using plasma wind tunnel
究科
Synthesis of spin glass materials

Name

Organization

Seiya Tanaka

The University ofTokyo

Maiko Kofu

Japan Atomic Energy
Agency長期留学研究員 / Long Term Young Researcher
No.

課題名

氏名

1

発光量絶対値測定系を用いたイクオリンの発光
量子収率の測定

小野

稜平

群馬大学

理工学府

2

銅と有機分子界面におけるバンド状態の巨大ス
ピン分裂の直接観測

下澤皐介

東京理科大学3

金属と有機分子界面におけるラシュバ分裂の増大

小久保

東京理科大学

裕太

所属

Title
Measurement of luminescence quantum yield of aequorin
using calibrated total-photon flux spectrometer

Name

Organization

Ryohei Ono

Gunma University

大学院理工学研 Direct observation of giant spin splitting band on organic
molecules/cooper interface.
究科

Kousuke Shimozawa

Tokyo University of
Science理工学部

yuta Kokubo

Tokyo University of
ScienceEnhancement of Rashba splitting on molecule/metal interface

ISSP Activity Report 2020

97

98

令和２年度 共同利用課題一覧（後期）/ Joint Research List (2020 Latter Term)

ISSP Activity Report 2020

嘱託研究員 / Commission Researcher
No.

課題名

担当所員：小森
1

氏名

Title

Name

Organization

文夫

レーザースピン角度分解光分光による表面電子状
矢治
態の研究

担当所員：上床所属

光一郎

物質・材料研究 先端材料解析研
SARPES studies of atomic layer materials at surfaces機構
究拠点

Koichiro Yaji

National Institute forMaterials Science

Masato Hedo

University of Ryukyus

美也

2

低温用マルチアンビル装置の開発

辺土

正人

琉球大学

理学部

3

希土類 122 化合物における圧力効果

繁岡

透

山口大学

大学院理工学研
Pressure effect of rare earth 122 compounds
究科

Toru Shigeoka

Yamaguchi University

4

圧力下 NMR 測定法に関する開発

藤原

直樹

京都大学

大学院人間・環 Development of NMR measurement method under highpressure
境学研究科

Naoki Fujiwara

Kyoto University5

極低温下の磁気特性

鳥塚潔

日本工業大学

共通教育学群

Development of magnetic measurement method

Kiyoshi Torizuka

Nippon Institute ofTechnology

6有機伝導体の圧力効果

村田惠三

大阪経済法科大学

Effect of pressure on the organic conductor

Keizo Murata

Osaka University of
Economice and Law

7

酸化物試料の作製と高圧下物性測定

川中浩史

産業技術総合研 電子光技術研究
Sample preparation and high pressure experiments
究所部門

Hirofumi Kawanaka

National Institute ofAdvanced Industorial
Science and Technology

8高圧下量子振動観測システム

摂待

力生

新潟大学

理学部

Rikio Settai

Niigata University

9

希釈冷凍機温度で使用可能な 10GPa 級超高圧発
松林生装置の開発和幸

電気通信大学

大学院情報理工 Development of 10GPa class high pressure apparatus for low
temperature
学研究科

KazuyukiMatsubayashi

The University
of ElectroCommunications

Development of multi-anvil apparatus for low temperature

Development of quantum oscillation under high pressure

Development of physical property measurement method using
Mika Kano
DAC

10 DAC を用いた物性測定方法の開発

狩野みか

日本工業大学

共通教育学群11 3 ｄ遷移化合物に関する圧力効果

鹿又武

東北学院大学

工学総合研究所 Effect of pressure on the 3d transition compounds

12 擬一次元有機物質の圧力下物性研究

糸井

充穂

日本大学

医学部

13 多重極限関連圧力装置の調整

高橋

博樹

日本大学

文理学部

Nippon Institute ofTechnology

Kanomata Takeshi

Tohoku Gakuin
University

Study on pressure induced superconductivity of quasi organic
conductor

Miho Itoi

Nihon University

Adjustment of Cubic Anvil apparatus

Hiroki Takahashi

Nihon University

No.

課題名

氏名

所属

Title

Name

Organization

Development of High Pressure X-ray diffraction measurements Tetsujiro Eto

Kurume Institute ofTechnology

14 高圧下 X 線回析法の開発

江藤

徹二郎

久留米工業大学 工学部

15 中性子回折用圧力発生装置の開発

宗像孝司

総合科学研究機 中性子科学セン
Development of high pressure apparatus for neutron diffraction Koji Munakata
構
ター

16 4G における共同利用推進

佐藤

卓

東北大学

多元物質科学研
Research and Support of General-Use at 4G
究所

Taku J Sato

Tohoku University

17

〃

奥山

大輔

東北大学

多元物質科学研究所〃

Daisuke Okuyama

Tohoku University

18

〃

那波

和宏

東北大学

多元物質科学研究所〃

Kazuhiro Nawa

Tohoku University

19 6G、T1-1 における共同利用推進

岩佐

和晃

茨城大学

フロンティア応
用原子科学研究 Research and Support of General-Use at 6G and T1-1
センター

Kazuaki Iwasa

Ibaraki University

20 T1-1、T1-3 における共同利用推進

大山

研司

茨城大学

大学院理工学研
Research and Support of General-Use at T1-1 and T1-3
究科

Kenji Ohoyama

Ibaraki University

21 T1-1 における共同利用推進

桑原

慶太郎

茨城大学

大学院理工学研
Research and Support of General-Use at T1-1
究科

Keitaro Kuwahara

Ibaraki University

22

〃

横山

淳

茨城大学

理学部

〃

Makoto Yokoyama

Ibaraki University

23

〃

伊賀

文俊

茨城大学

大学院理工学研
究科〃

Fumitoshi Iga

Ibaraki University

24 T1-2、T1-3、6G における共同利用推進

藤田

全基

東北大学

金属材料研究所 Research and Support of General-Use at T1-2, T1-3 and 6G

Masaki Fujita

Tohoku University

25

〃

南部

雄亮

東北大学

金属材料研究所〃

Yusuke Nambu

Tohoku University

26

〃

池田

陽一

東北大学

金属材料研究所〃

Yoichi Ikeda

Tohoku University

27

〃

谷口

貴紀

東北大学

金属材料研究所〃

Takanori Taniguchi

Tohoku University

28 T2-2、T1-3 における共同利用推進

木村

宏之

東北大学

多元物質科学研
Research and Support of General-Use at T1-2 and T1-3
究所

Hiroyuki Kimura

Tohoku University

29

坂倉

輝俊

東北大学

多元物質科学研究所

Terutoshi Sakakura

Tohoku University

担当所員：山室CROSS修

ISSP Activity Report 2020

99

〃

〃

100

No.

課題名

30

〃

氏名

所属

ISSP Activity Report 2020

山本

孟

東北大学

多元物質科学研究所

31 C1-2 における共同利用推進

杉山

正明

京都大学

32 C1-2、C2-3-1 における共同利用推進

井上

倫太郎

33

守島

34 C3-1-2、C2-3-1 における共同利用推進

Title

Organization

Hajime Yamamoto

Tohoku University

複合原子力科学
Research and Support of General-Use at C1-2
研究所

Masaaki Sugiyama

Kyoto University

京都大学

複合原子力科学
Research and Support of General-Use at C1-2 and C2-3-1
研究所

Rintaro Inoue

Kyoto University

健

京都大学

複合原子力科学研究所

Ken Morishima

Kyoto University

日野

正裕

京都大学

複合原子力科学
Research and Support of General-Use at C2-1-2 and C2-3-1
研究所

Masahiro Hino

Kyoto University

35 C3-1-2 における共同利用推進

田崎

誠司

京都大学

複合原子力科学
Research and Support of General-Use at C3-1-2
研究所

Seiji Tasaki

Kyoto University

36

〃

小田

達郎

京都大学

複合原子力科学研究所〃

Tatsuro Oda

Kyoto University

37

〃

北口

雅暁

名古屋大学

大学院理学研究科〃

Masaaki Kitaguchi

Nagoya University

中川

慎太郎

東京大学

生産技術研究所 Research and Support of General-Use at C1-2 and C2-3-1

Shintaro Nakagawa

The University of
Tokyo

孝幸

大阪大学

大学院基礎工学 Research on electron state of molecular crystals using
photoemission spectroscopy
研究科

Takayuki Kisu

Osaka University〃

38 C1-2、C2-3-1 における共同利用推進
担当所員：近藤
39

〃

Name

〃

猛

光電子分光法を用いた各種分子性結晶の電子状態
木須の研究及び装置の低温化

40 トポロジカル絶縁体の電子状態の解明

木村

昭夫

広島大学

大学院理学研究
Electronic-structure study of topological insulators
科

Akio Kimura

Hiroshima University

41 トポロジカル超伝導体の探索

坂野

昌人

東京大学

大学院工学系研Research for topological insulators
究科

Masato Sakano

The University ofTokyo

42 有機化合物の光電子分光

金井要

東京理科大学

理工学部

Kaname Kanai

Tokyo University of
Science

43 高分解能光電子分光による強相関物質の研究

横谷

尚睦

岡山大学

異分野基礎科学
Ultra-high resolution study on strongly correlated materials
研究所

Takayoshi Yokoya

Okayama Universiry

松田

祐司

京都大学

大学院理学研究 Study of Majorana Fermion in Solids by Laser Photoemission
Spectroscopy
科

Yuji Matsuda

Kyoto University

担当所員：岡﨑

Photoemission study on organic compounds

浩三

44 固体中のマヨラナ粒子の研究

No.

課題名

45

〃

氏名

所属

Title

Name

Organization〃

Masatoshi Sato

Kyoto University

佐藤

昌利

京都大学

基礎物理学研究所

60-eV レーザーを用いた時間分解光電子分光の開
石坂
発

香子

東京大学

大学院工学系研 The development of time-resolved photoemission using 60eV
laser
究科

Kyoko Ishizaka

The University of
Tokyo

小嗣

真人

東京理科大学

基礎工学部

Construction and utilization research of aberration correction
photoelectron emission microscopy

Masato Kotsugi

Tokyo University of
Science

FeSe 超伝導体における BCS-BES クロスオーバ
ーの研究

紺谷

浩

名古屋大学

大学院理学研究
Study of BCS-BES crossover in FeSe superconductors
科

Hiroshi Kontani

Nagoya University

49 時間分解光電子分光を用いた強相関物質の研究

溝川

貴司

早稲田大学

理工学術院

Takashi Mizokawa

Waseda University

時間分解光電子分光や超高分解能光電子分光を用吉田
いた超伝導体や強相関物質の研究

鉄平

京都大学

大学院人間・環 Laser ARPES study on superconductors and strongly-correlated
Teppei Yoshidamaterials
境学研究科

Kyoto University

理化学研究所

創発物性科学研
Laser-ARPES on Fe superconductor
究センター

Takahiro Shimojima

RIKEN

上智大学

大学院機能創造 Study of high -Tc superconductors by high-resolution laser
ARPES
理工学科

Weilu Zhang

Sophia University

大阪大学

産業科学研究所

Shigemasa Suga

Osaka University

46

47 収差補正型光電子顕微鏡の建設と利用研究
48

50

51 鉄系超伝導体のレーザー光電子分光
52

下志万

貴博

超高分解能レーザー光電子分光による高温超伝導 チャン
体の研究
イル

ウェ

担当所員：原田Time-resolved photoemission study on strongly-correlatedmaterials

慈久

ISSP Activity Report 2020

53

軟 X 線発光・共鳴非弾性散乱分光の磁気円・線二色性測定システムの構築

菅54

軟 X 線吸収 / 発光分光法によるリチウムイオン
電池電極材料の電子物性研究

細野英司

産業技術総合研 省エネルギー研 Study on the electronic property of electrode materials for Liion batteries by soft X-ray absorption/emission spectroscopy
究所
究部門

Eiji Hosono

National Institute ofAdvanced Industorial
Science and Technology

55

〃

朝倉

大輔

産業技術総合研 省エネルギー研
究所
究部門

Daisuke Asakura

National Institute ofAdvanced Industorial
Science and Technology

56 高分解能光電子分光による酸化バナジウムの研究 藤原

秀紀

大阪大学

大学院基礎工学
Study on vanadium oxides by high resolution Photoemission
研究科

Hidenori Fujiwara

Osaka University

57 省エネ・創エネ・蓄電デバイスのオペランド分光 尾嶋

正治

東京大学

大学院工学系研 Operando nano-spectroscopy for energy efficient, power
generation and energy storage devices
究科

Masaharu Oshima

The University ofTokyo

東京工業大学

物質理工学院

Tomohiro Hayashi

Tokyo Institute ofTechnology

58

原子レベルで制御されたモデル有機分子表面上の林
界面水の電子状態観測

智広

Construction of a noble system for circular and linear
dichroism in soft X-ray emission and RIXS spectroscopy〃

Analysis of the electronic structure of the interfacial water
formed on model organic surfaces

木下豊彦

高輝度光科学研 分光・イメージ Technical development of time-resolved photoemission
microscopy measurement
究センター
ング推進室

Toyohiko Kinoshita

JASRI

三次元 nanoESCA による実デバイスのオペラン
永村
ド電子状態解析直佳

物質・材料研究 先端材料解析研 Operando analysis of the electronic stucrure of actual device
by 3DnanoESCA
機構
究拠点

Naoka Nagamura

National Institute forMaterials Science

59 時間分解光電子顕微分光実験の技術開発

101

60

滋正

102

No.

課題名

担当所員：松田

所属

Title

Name

Organization

巌

ISSP Activity Report 2020

61 不均一触媒反応のオペランド光電子測定
62

氏名

小板谷

単原子層シートの原子・電子構造のダイナミクス
虻川
研究

貴典

Operendo photoelectron spectroscopy of heterogeneous
自然科学研究機
分子科学研究所
catalysts
構

Takanori Koitaya

National Institute of
Natural Scienses

匡

東北大学

多元物質科学研 Dynamics in atomic and electronic structures of monatomic
sheets究所

Tadashi Abukawa

Tohoku University

Susumu Yamamoto

Tohoku University

Yasuyuki Hirata

National Defence
Academy63 雰囲気光電子分光装置の高度化

山本

達

東北大学

多元物質科学研
Updates of the NAP-XPS machine究所

64 偏光制御型軟 X 線分光装置の開発

平田

靖透

防衛大学校

応用物理学科65 遷移金属化合物の時間分解 X 線分光と回析

和達大樹

兵庫県立大学

大学院物理学研 Time-resolved x-ray spectroscopy and diffraction of transitionHiroki Wadachi
metal-compounds
究科University of Hyogo

66 超高速磁化応答による磁性波動関数の制御

小林

正起

東京大学

大学院工学系研 Regulation of magnetic wave functions by ultrafast
magnetization response
究科

Masaki Kobayashi

The University ofTokyo

67 時間分解磁気光学実験の技術開発

小嗣真人

東京理科大学

基礎工学部

Masato Kotsugi

Tokyo University of
Science

Development of a system for the polarization-controlled soft
X-ray spectroscopy

Technical development of time-resolved magneto-opticalexperiment

一般研究員 / General Researcher
No.

課題名

担当所員：瀧川
1

氏名

Name

Organization

裕子

大阪府立大学

大学院理学系研 NMR study on the magnetodielectric properties of organic
equilateral triangular spin system
究科

Yuko Hosokoshi

Osaka Prefecture
University

一成

立命館大学

理工学部

Investigation on new superconductor UTe2

Kazunari Machida

Ritsumeikan University

洋

学習院大学

理学部物理学科

Experimental detection of quantum monopole in quantum spin
Yo Machida
ice systems

上原

大毅

学習院大学

大学院自然科学研究科

高度なスピン配列制御が作り出す多彩な量子状態
山口
の低温物性

博則

大阪府立大学

大学院理学系研 Low temperature physical properties of various quantum states
Hironori Yamaguchi
formed by advance spin alignment control
究科

俊郎

2

新規超伝導体 UTe2 の対関数の対称性の研究

3

量子スピンアイス物質における量子モノポールの
町田
実験的検出

5

Title

仁

正三角スピン系有機トリラジカルの窒素核磁気共細越
鳴による磁気誘電現象の解明

担当所員：榊原

4

所属

〃

町田

〃

Taiki Uehara

Gakushuin University
Gakushuin University
Osaka Prefecture
University

No.

課題名

氏名

所属

Title

Name
Takanori Taniguchi

Organization

6

重い電子化合物 YbCu4Au の極低温比熱測定

谷口

貴紀

東北大学

金属材料研究所

The specific heat measurement with a dilution refrigerator in
the heavy fermion compound YbCu4Au

7

大型単結晶試料を用いた Sr2RuO4 の磁場方位制
御下における極低温磁化測定

橘高

俊一郎

中央大学

理工学部

Low-temperature magnetization measurement on a large single
Shunichiro Kittaka
crystal of Sr2RuO4 under a precise control of field orientation

8

〃

河野

洋平

中央大学

理工学部

ファラデー力磁力計による単サイトで発現するメ池田
タ磁性の解明陽一

東北大学

金属材料研究所

北澤

崇文

東北大学

大学院理学研究科11

ウラン・トリウム非従来型超伝導体・磁性体の磁清水化・熱膨張測定悠晴

東北大学

金属材料研究所

12

新規金属有機カゴメ格子磁性体のスピン液体状態
山口
の研究

明

兵庫県立大学

大学院物質理学 Study of spin liquid state in a novel metal-organic kagome
antiferromagnet
研究科

Akira Yamaguchi

University of Hyogo

9
10

〃

〃
Clarification of the metamagnetism occurring in isolated
magnetic Yb ions with a Faraday force magnetometer〃

Tohoku University
Chuo University

Yohei Kono

Chuo University

Yoichi Ikeda

Tohoku University

Takafumi Kitazawa

Tohoku University

Magnetization and magnetosriction measurements of uraniumYusei Shimizu
thorium based unconventional superconductors

Tohoku University

ISSP Activity Report 2020

13

〃

松下

琢

名古屋大学

大学院理学研究
科〃

Taku Matsushita

Nagoya University

14

〃

丸本

涼太

名古屋大学

理学研究科

〃

Ryota Marumoto

Nagoya University

15

〃

帳

中岳

東海国立大学機 物質科学国際研
構名古屋大学究センター〃

Zhongyue Zhang

Nagoya University

空間反転対称性の破れた重い電子系物質 CeIrSi3
呉のフェルミ面転移

易簡

東北大学

大学院理学研究 Fermi surface reconstruction in noncentrosymmetric heavy
fermion compound CeIrSi3
科

Wu Yijian

Tohoku University

Hiroaki Shishido

Osaka Prefecture
University

16

担当所員：山下穰
宍戸寛明

大阪府立大学

大学院工学研究 Magnetic torque measurements on YbRh2Si2 at ultra-low
temperatures
科

二次元銅酸化物のホール測定と MPMS による磁神戸化の測定 III士郎

山形大学

大学院理工学研 Hall coefficient measurement of 2D cuprates and measurement
Shiro Kambeof magnetic property by MPMS III
究科

Yamagata University

熊本大学

大学院先端科学 Quantum transport in a graphene on a titanium oxide
nanosheet
研究部

Masahiro Hara

Kumamoto University

日本女子大学

理学部

Ryosuke Ishiguro

Japan Women's
University

17 YbRh2Si2 の超低温における磁気トルク測定
担当所員：勝本
18

信吾

19 酸化チタンナノシート上グラフェンの量子輸送

103

20

原

金属とファンデルワールス結晶と接合界面におけ
石黒る界面状態の研究

正大
亮輔

Study of Interface States at Junction between Metals and vander Waals Crystals

104

No.

課題名

21

〃

ISSP Activity Report 2020

22

所属

あや

日本女子大学

大学院理学研究科昭

兵庫医科大学

物理学教室

悟

浜本

量子ホール効果のための高移動度半導体試料作製
福田と超低温での測定担当所員：小森
23

氏名

Title

Name

Organization〃

Aya Hamamoto

Japan Women's
University

Development of the high mobility semiconductor samples forthe quantum Hall state and their measurements in very low
temperature

Akira Fukuda

Hyogo College ofMedicine

九州大学

大学院工学研究 Evaluation of electronic structures of twisted bilayer graphene
Satoru Tanaka
fabricated by a vacuum transfer technique
院

Kyushu University

文夫

真空転写法により形成したツイスト２層グラフェ
田中
ンの電子状態評価

24〃

ビシコフスキー アントン

九州大学

大学院工学研究院〃

Visikovskiy Anton

Kyushu University

25

〃

今村

均

九州大学

大学院工学研究院〃

Hitoshi Imamura

Kyushu University

SiC ナノ周期表面上に転写したグラフェンの電子
田中
状態の観察

悟

九州大学

大学院工学研究 Evaluation of electronic structures of graphene transferred on
SiC periodic nanosurfaces
院

Satoru Tanaka

Kyushu University

魚谷 亮介

九州大学

大学院工学研究院

Ryosuke Uotani

Kyushu University

26
27

〃

〃

28

酸素サーファクタントを用いた Fe 薄膜の成長過中辻程と電子状態寛東京工業大学

物質理工学院

Oxygen surfactant assisted growth of Fe thin-films and theirelectronic states

Kan Nakatsuji

Tokyo Institute ofTechnology

29

微傾斜 Si(111) √ 3 ×√ 3-B 基板上に成長した
Bi(110) 超薄膜の電子状態

中辻寛

東京工業大学

物質理工学院

Electronic structure of Bi(110) thin films grown on vicinal
Si(111) √ 3 ×√ 3-B substrates

Kan Nakatsuji

Tokyo Institute ofTechnology

中辻寛

東京工業大学

物質理工学院

Atomic structure of Si(110)3 × 2-Bi surface

Kan Nakatsuji

Tokyo Institute ofTechnology

大阪大学

Scanning tunneling spectroscopy of surfaces of exotic rare
産業科学研究所 earth and transition metal compounds and adsorbed magnetic Shigemasa Suga
atoms

中央大学

理工学部

30 Si(110)3 × 2-Bi 表面の原子構造

特異なスピン状態を持つ希土類及び遷移金属化合31 物表面及び吸着磁性原子電子状態とスピン状態の 菅
STS 解析
32 窒素を吸着させた Cu(001) 面における構造緩和担当所員：リップマー

山田

滋正
正理

担当所員：秋山

英文Masamichi Yamada

Chuo University

ミック

33 機械学習を活用した高効率薄膜作製手法の高度化 大久保
34 無機材料薄膜合成

Structural relaxation on a Cu(001) surface with adsorbed
nitrogen

Osaka University

大口

勇男

裕之

国際ナノアーキ
Development of an efficient thin film growth technique using a
物質・材料研究
Isao Ohkubo
テクトニクス研
machine learning approach機構
究拠点

National Institute forMaterials Science

芝浦工業大学

Shibaura Institute ofTechnology

工学部

Film growth of inorganic materials

Hiroyuki Oguchi

No.

課題名

氏名

所属

Title

Name

Organization

多波長励起フォトルミネッセンス測定による
35 GaPN 混晶および GaPAsN 混晶のアップコンバ
ージョン発光に関する研究

矢口

裕之

埼玉大学

大学院理工学研 Multiple wavelength excited photoluminescence measurements
Hiroyuki Yaguchi
of up-conversion luminescence from GaPN and GaPAsN alloys
究科

Saitama University

36

〃

高宮

健吾

埼玉大学

総合技術支援センター〃

Kengo Takamiya

Saitama University

37

〃

相良

鋼

埼玉大学

大学院理工学研
究科〃

Hagane Sagara

Saitama University

静岡大学

学術院理学領域

Takao Ebihara

Shizuoka University

静岡大学

大学院総合科学技術研究科〃

Hiroshi Maruyama

Shizuoka University〃

Jumaeda Jatmika

Shizuoka University

担当所員：中辻

知、大谷

義近
海老原

39

〃

丸山

40

〃

ジュマエダ・
ジャトミカ

静岡大学

自然科学教育部

41 Si 基板上垂直配向 L10 規則化 CoPt の磁化測定

山浦淳一

東京工業大学

元素戦略研究セ Magnetization measurement of perpendicular oriented L10ordered CoPt on Si substrates
ンター

Junichi Yamaura

Tokyo Institute ofTechnology

42

〃

真島

豊

東京工業大学

科学技術創成研究院〃

Yutaka Majima

Tokyo Institute ofTechnology

43

〃

遠山

諒

東京工業大学

物質理工学院〃

Ryo Toyama

Tokyo Institute ofTechnology

担当所員：廣井孝雄

Physical properties in rare earth intermetallic compounds athigh magnetic fields in low temperature

38 希土類金属間化合物の強磁場低温物性研究

博史

善二

ISSP Activity Report 2020

105

44

新しい三角格子クラスター Mott 絶縁体における原口
量子スピン液体相の探索

祐哉

東京農工大学

大学院工学研究 Search for quantum spin liquid phase in a new triangularlattice cluster Mott insulator
院

Yuya Haraguchi

University ofAgriculture andTechnology45交流磁化率測定による有機超伝導体の相分離の研
谷口
究

弘三

埼玉大学

大学院理工学研 Study on phase separation phenomena in organic
superconductor by ac susceptibility measurements
究科

Hiromi Taniguchi

Saitama University

高橋

啓太

埼玉大学

大学院理工学研
究科

Keita Takahashi

Saitama University

47 YbH2+x の磁性と伝導中村修

岡山理科大学研究 ･ 社会連携
Magnetic and transport properties in YbH2+x
センター

Osamu Nakamura

Okayama University of
Science48 MnCo1-xGe 合金の磁気特性に関する研究 (4)

江藤

徹二郎

久留米工業大学 共通教育科

Tetsujiro Eto

Kurume Institute ofTechnology

46
担当所員：上床〃〃美也

Study of magnetic properties in MnCo1-xGe alloys(4)

106

No.

課題名

氏名

Title

Name

Organization

山口大学

大学院創成科学 Evidence for the magnetic ordering of Yb momentaccompanied by the valence transition II
研究科

Tetsuya Fujiwara

Yamaguchi University

達哉

山口大学

大学院創成科学研究科

Tatsuya Kaneko

Yamaguchi University

51 TmRh2Si2 化合物の単結晶育成 (2)

藤原 哲也

山口大学

大学院創成科学
Single crystal growth of TmRh2Si2 compound II
研究科

Tetsuya Fujiwara

Yamaguchi University

52

西崎 裕哉

山口大学

大学院創成科学研究科

Yuya Nishizaki

Yamaguchi University

53 HoRh2Si2 の Pd 置換系化合物の単結晶育成 (2)

藤原 哲也

山口大学

大学院創成科学 Single crystal growth of Co substituted HoRh2-xPdxSi2
compounds II研究科

Tetsuya Fujiwara

Yamaguchi University

54

小林 遼平

山口大学

大学院創成科学研究科

Ryohei Kobayashi

Yamaguchi University

55 EuMn2Ge2 単結晶の磁場中比熱測定 (3)

藤原 哲也

山口大学

大学院創成科学 Specific heat measurement under magnetic field of
EuMn2Ge2 single crystal III
研究科

Tetsuya Fujiwara

Yamaguchi University

56

杉田

静留

山口大学

大学院創成科学研究科〃

Shizuru Sugita

Yamaguchi University

57 重い電子化合物 YbCu4Au の極低温高圧測定

谷口

貴紀

東北大学

金属材料研究所

The ultra-low temperature and high-pressure measurement in
the heavy fermion compound YbCu4Au

Takanori Taniguchi

Tohoku University

58

高濱

元史

東北大学

大学院理学研究科〃

59

有機伝導体物性に与える高圧力媒体の分子形状の村田
効果 # 2

惠三

大阪経済法科大 ２１世紀社会総 Effect of Molecular Shape of the High Pressure Medium to the
Keizo Murata
学合研究センター Properties of Organic Conductors #2

60

スピン三重項超伝導体 UTe2 の磁性と超伝導の圧
本多
力効果

史憲

東北大学

金属材料研究所

Effect of Pressure on the magnetism and superconductivity ofa spin triplet superconductor UTe2

Fuminori Honda

Tohoku University

清水

悠晴

東北大学

金属材料研究所〃

Yusei Shimizu

Tohoku University

62 ウラン化合物の磁性の圧力効果

本多

史憲

東北大学

金属材料研究所 Effect of Pressure on the magnetism of uranium compounds

Fuminori Honda

Tohoku University

63

小泉 尭嗣

東北大学

大学院工学研究
科

Takatsugu Koizumi

Tohoku University

鹿児島大学

大学院理工学研 Study on the magneto-volume effect of half-metallic Heusler
alloys究科

Iduru Shigeta

Kagoshima University

鹿児島大学

大学院理工学研
究科

Soichiro Tsujikawa

Kagoshima University

49

ISSP Activity Report 2020

50

61

64
65

圧力誘起価数転移によって発生する Yb モーメン
藤原 哲也
トの磁気秩序についての検証 (2)

所属

〃

〃

〃

〃

〃

〃

〃

金子

ハーフメタルホイスラー合金の磁気体積効果に関
重田 出
する研究
〃

辻川

聡一朗

〃

〃

〃

〃

〃

Motofumi Takahama Tohoku University
Osaka University of
Economics and Law

No.

課題名

氏名

所属

Title

Name

Organization

66 HfTe3 の高圧力下電気抵抗率の測定

加瀬直樹

東京理科大学

理学部応用物理High pressure study of the single crystal of HfTe3
学科

67 磁気冷凍材料候補物質 EuS の圧力下磁化測定

脇舎

和平

室蘭工業大学

希土類材料研究 Pressure effects on the magnetic and magnetocaloric properties
Kazuhei Wakiyaof EuSセンター

Muroran Institute ofTechnology

68

西村

肇

室蘭工業大学

大学院工学研究
科

Hajime Nishimura

Muroran Institute ofTechnology

69 中性子回折用小型圧力セルの開発

宗像孝司

総合科学研究機 中性子科学セン
Development of compact pressure cell for neutron diffraction
構
ター

Koji Munakata

CROSS

70 スピネル Fe1-xCuxCr2S4 の高圧下磁性

伊藤

昌和

鹿児島大学

総合科学域総合
Magnetic properties of spinel Fe1-xCuxCr2S4 in high pressure
教育学系

Masakazu Ito

Kagoshima University

Sm2Fe17-N2 気相 - 固相反応において窒素ガス圧
尾上
力が磁気特性に及ぼす効果

昌平

鹿児島大学

研究推進機構研 Effect of nitrogen gas pressure on the magnetic properties of究支援センター Sm2Fe17Nx

Masahira Onoue

Kagoshima University

高橋

巡季

鹿児島大学

大学院理工学研
究科

Junki Takahashi

Kagoshima University

磁場中熱処理により分解した Cu-Mn-Al 合金の磁
三井
気特性

好古

鹿児島大学

大学院理工学研 Magnetic properties of Cu-Mn-Al alloys decomposed by inmagnetic-field annealing
究科

Yoshifuru Mitsui

Kagoshima University

中川

駿

鹿児島大学

大学院理工学研
究科

Shun Nakagawa

Kagoshima University

75 圧力下 NMR 測定法に関する開発

藤原

直樹

京都大学

大学院人間・環Development of NMR measurements under pressure
境学研究科

Naoki Fujiwara

Kyoto University

76

〃

中村

昂矢

京都大学

大学院人間・環境学研究科〃

Kouta Nakamura

Kyoto University

77

〃

桑山

昂典

京都大学

大学院人間・環境学研究科〃

Takanori Kuwayama Kyoto University

78

〃

猪股

和也

京都大学

大学院人間・環境学研究科〃

Kazuya Inomata

Kyoto University

東北大学

金属材料研究所 Effect of Pressure on the magnetism of uranium compounds

Arvind Maurya

Tohoku University

Riki Kobayashi

University of the
Ryukyus

Takatoshi Okabe

University of the
Ryukyus

71

〃

72
73

〃

74

〃

ISSP Activity Report 2020

79 ウラン化合物の磁性の圧力効果
担当所員：益田

モーリヤ
ルビン

ア

〃

〃

〃

Naoki Kase

Tokyo University of
Science

隆嗣

107

80 (Ce1-xLax)5Ga2Ge 単結晶試料の極低温比熱測定

小林

理気

琉球大学

理学部

81

岡部

孝俊

琉球大学

大学院理工学研
究科〃

Specific heat measurement at very low temperature on(Ce1-xLax)5Ga2Ge systems
〃

108

No.

課題名

氏名

CeTe1-xGex 単結晶試料の高エネルギー X 線ラウ
小林
エ装置による結晶方位同定

所属

Title
Alignment of CeTe1-xGex single crystals by high-energy X-ray
Laue diffraction

Organization

Riki Kobayashi

University of the
Ryukyus

Yuki Iwata

University of the
Ryukyus

Riki Kobayashi

University of the
Ryukyus

Gaku Fujii

University of the
Ryukyus

理気

琉球大学

理学部

岩田

由規

琉球大学

大学院理工学研
究科

84 Ce5(Si1-xGex)3 単結晶試料の極低温比熱測定

小林

理気

琉球大学

理学部

85

藤井

岳

琉球大学

大学院理工学研
究科

祐哉

東京農工大学

大学院工学研究 Search for field-induced phase transitions in new cobalt-based
Yuya Haraguchi
Kitaev-Heisenberg-type magnets
院

吉田

悠澄

東京農工大学工学府

パルス強磁場磁化測定による Yb 希薄系における
池田
単サイトメタ磁性の全貌の観測

陽一

東北大学

Observation of the whole picture of single-site metamagnetism
Yoichi Ikeda
金属材料研究所 in a diluted Yb system by a pulsed high magnetic fieldmagnetization measurement

Tohoku University

北澤

崇文

東北大学

大学院理学研究
科

Takafumi Kitazawa

Tohoku University

90 幾何学的フラストレート磁性体の強磁場磁化測定 菊池

彦光

福井大学

学術研究院

Hikomitsu Kikuchi

University of Fukui

比熱および電気抵抗測定による Yb 希薄系におけ池田る縮重度の大きな不純物近藤効果の検証

陽一

東北大学

Verification of the highly degenerated impurity Kondo effect
金属材料研究所 in diluted Yb systems by specific heat and electrical resistivity Yoichi Ikeda
measurements

Tohoku University

Takafumi Kitazawa

Tohoku University

82

ISSP Activity Report 2020

Name

83

〃

〃

担当所員：金道
86
87
88
89

91

〃
Specific heat measurement at very low temperature on
Ce5(Si1-xGex)3 systems〃

浩一

新しいコバルト系キタエフ - ハイゼンベルグ型磁
原口性体における磁場誘起相転移の探索
〃

〃

〃

〃
Magnetization measurements of the frustrated magnets

Yuto Yoshida

University ofAgriculture andTechnology

Tokyo Universityof Agriculture andTechnology

92

〃

北澤

崇文

東北大学

大学院理学研究科93Bi-2212 単結晶における修正コーラー則の検証
(II)

渡辺

孝夫

弘前大学

大学院理工学研 Investigation of the modified Kohler’ s rule on Bi-2212 single
crystals(II)究科Takao Watanabe

Hirosaki University

94

〃

藤井

武則

東京大学

低温センター〃Takenori Fujii

The University of
Tokyo

95

〃

原田

圭市

弘前大学

大学院理工学研
究科〃

Keiichi Harada

Hirosaki University

ウラン系磁性体・常磁性体における強磁場領域遍
清水
歴メタ磁性の探索

悠晴

東北大学

金属材料研究所

Study of itinerant metamgnetism in uranium-based magnetic
and paramagnetic systems

Yusei Shimizu

Tohoku University

昌和

鹿児島大学

総合科学域総合
High magnetic field electric resistivity of spinel Fe1-xCuxCr2S4
教育学系

Masakazu Ito

Kagoshima University

96

97 スピネル Fe1-xCuxCr2S4 の高磁場電気抵抗

伊藤

〃

No.

課題名

氏名

所属

Title

Name

Organization

Yoshinori Imai

Tohoku University

Hironori Yamaguchi

Osaka Prefecture
University

Yuko Hosokoshi

Osaka Prefecture
University

Takao Ebihara

Shizuoka University

98

α -RuBr3 の磁場配向試料の作製と強磁場磁化過
今井
程の測定

良宗

東北大学

大学院理学研究 Preparation of magnetically oriented α -RuBr3 and high-fieldmagnetization measurements
科99

有機ラジカル系が創る新規スピンモデルの低温物
山口
性

博則

大阪府立大学

理学系研究科100

有機ビラジカルによる強磁性フラストレート磁性
細越
体の強磁場磁化測定

裕子

大阪府立大学

大学院理学系研 High-field magnetization study of ferromagnetic frustrated
lattice made of organic biradicals
究科

静岡大学

学術院理学領域

静岡大学

大学院総合科学技術研究科〃

Hiroshi Maruyama

Shizuoka University〃

Jumaeda Jatmika

Shizuoka University
Tokyo Universityof Agriculture andTechnology

担当所員：徳永

Low temperature physical properties of new spin models
formed by organic radicals

将史
海老原

102

〃

丸山

103

〃

ジュマエダ・
ジャトミカ

静岡大学

自然科学教育部

104 カイヤナイト M2GeO5 (M=Cr, V) の磁性

香取

浩子

東京農工大学

大学院工学研究
Magnetism of Kyanite M2GeO5 (M=Cr and V)
院

Hiroko Katori

105

柿本

和勇

東京農工大学工学府

Kazuo Kakimoto〃

孝雄

Electronic states at high magnetic fields in Heavy Fermion
systems

101 重い電子系における強磁場中の電子状態研究

博史〃

Tokyo Universityof Agriculture andTechnology

ISSP Activity Report 2020

106

トーラス型フェルミ面を持つラシュバ型半導体の村川
量子極限伝導特性の研究

寛

大阪大学

大学院理学研究 High field study for quantum limit transport properties of torus
Hiroshi Murakawa
Fermi surface in Rashba semiconductor
科

Osaka University

107

元素置換した BaMnX2 単結晶における強磁場輸
送現象の研究

酒井

英明

大阪大学

大学院理学研究 Study of high-field transport phenomena in chemicallysubstituted BaMnX2 single crystals
科

Hideaki Sakai

Osaka University

108

〃

近藤

雅起

大阪大学

大学院理学研究科〃

Masaki Kondo

Osaka University

109

〃

阪口

駿也

大阪大学

大学院理学研究
科〃

Shunya Sakaguchi

Osaka University

110 新規超伝導体 UTe2 の電子状態の圧力効果の研究 本多

史憲

東北大学

金属材料研究所

Study of exotic electronic properties of a new superconductor
UTe2 under high pressure

Fuminori Honda

Tohoku University

ウラン系化合物における新奇フラストレーション
清水
系磁性体の探索悠晴

東北大学

金属材料研究所

Exploration of novel frustrated magnetic system in uranium
compounds

Yusei Shimizu

Tohoku University

暢

神戸大学

分子フォトサイエンス研究セン High-field magnetocaloric effect in Sr2CoGe2O7
ター

Mitsuru Akaki

Kobe University

健太

東京大学

大学院新領域創 Dielectric constant measurements of square cupola
antiferromagnet Ba(TiO)Cu4(PO4)4
成科学研究科

Kanta Kimura

The University of
Tokyo

111

112 Sr2CoGe2O7 の強磁場磁気熱量効果

109

113

赤木

正四角台塔反強磁性体 Ba(TiO)Cu4(PO4)4 におけ木村
るパルス磁場中誘電率測定

110

No.

課題名

114

反強磁性金属α -Mn のパルス強磁場下磁化過程
の解明

所属

Title

Organization

ISSP Activity Report 2020

和人

岡山大学

大学院自然科学 Magnetization process of antiferromagnetic metal α -Mn inpulsed magnetic field
研究科

Kazuto Akiba

Okayama University

量子カゴメ反強磁性体 CaCu3(OH)6Cl2・0.6H2O
吉田の強磁場磁化測定

紘行

北海道大学

大学院理学研究 High-field magnetization measurements on quantum kagome
antiferromagnet CaCu3(OH)6Cl2・0.6H2O
院

Hiroyuki Yoshida

Hokkaido University

Kenta Kimura

The University ofTokyo

Explorations of the spin nematic phase in the chromium spinel
Shojiro Kimuraoxide

Tohoku University

担当所員：小濱

康弘

芳允

116

正四角台塔反強磁性体 Pb(TiO)Cu4(PO4)4 におけ木村
る強磁場中での電気磁気光学効果の研究

健太

東京大学

大学院新領域創 Optical magnetoelectric effect of the square-cupola-based
antiferromagnet Pb(TiO)Cu4(PO4)4 in a high magnetic field
成科学研究科117

クロムスピネル酸化物におけるスピンネマティッ
木村
ク相の探索

尚次郎

東北大学

金属材料研究所

和也

東京大学

大学院工学系研 Physical property measurement of organic spin liquid
candidate material under ultra high field
究科

118 有機スピン液体候補物質の超強磁場下物性測定
119

Name

秋葉

担当所員：松田
115

氏名

宮川

リフレクトメーターを用いた超強磁場下での電気
東京工業大学
抵抗測定の開発

担当所員：小林

元素戦略研究セ研究員
ンター

Development of electrical resistance measurement byreflectometer under ultra-high magnetic fieldKazuya Miyagawa

The University ofTokyo

Shiro Kawachi

Tokyo Institute ofTechnology

Advanced Industrial
Science andTechnology

洋平

120 次世代レーザーとレーザー加工の基礎技術研究

吉富

大

産業技術総合研 電子光基礎技術 Basic research on next generation laser systems and laser
machining technology
究所
研究部門

Dai Yoshitomi

121

〃

鳥塚

健二

産業技術総合研 電子光基礎技術
究所
研究部門

〃

Kenji Torizuka

122

〃

高田

英行

産業技術総合研 電子光基礎技術
究所
研究部門

〃

Hideyuki Takada

123

〃

奈良崎

産業技術総合研 電子光基礎技術
究所
研究部門

〃

Aiko Narazaki

124

〃

田中

真人

産業技術総合研 分析計測標準研
究所
究部門

〃

Masahito Tanaka

125

〃

小川

博嗣

産業技術総合研 分析計測標準研
究所
究部門

〃

Hiroshi Ogawa

126

〃

佐藤

大輔

産業技術総合研 分析計測標準研
究所
究部門

〃

Daisuke Satoh

127

〃

澁谷

達則

産業技術総合研 分析計測標準研
究所
究部門

〃

Tatsunori Shibuya

愛子

Advanced Industrial
Science andTechnology
Advanced Industrial
Science andTechnology
Advanced Industrial
Science andTechnology
Advanced Industrial
Science andTechnology
Advanced Industrial
Science andTechnology
Advanced Industrial
Science andTechnology
Advanced Industrial
Science andTechnology

No.

課題名

128

〃

黒田

隆之助

産業技術総合研
究所

129

〃

盛合

靖章

産業技術総合研
究所

130

〃

寺澤

英知

産業技術総合研
究所

131

〃

牛窪

大樹

産業技術総合研
究所

森山

匡洋

東京大学

大学院理学系研究科付属フォトンサ
イエンス研究機構

耕一郎

京都大学

132 短波長パルスレーザーによる CFRP 加工
133

氏名Yb モードロックファイバーレーザーに同期した
田中
Er モードロックファイバーレーザーの開発

所属

Title

Name

Organization〃

Ryunosuke Kuroda

Advanced Industrial
Science andTechnology〃

Yasuaki Moriai〃

Eichi Terasawa〃

Daiki Ushikubo

Advanced Industrial
Science andTechnology

Masahiro Moriyama

The University ofTokyo

大学院理学研究 Development of Er mode-locked fiber-laser system
synchronized with Yb mode-locked fiber-laser
科

Koichiro Tanaka

Kyoto University

先端オペランド計測
技術オープンイノベ
ーションラボラトリ
先端オペランド計測
技術オープンイノベ
ーションラボラトリ
先端オペランド計測
技術オープンイノベ
ーションラボラトリ
先端オペランド計測
技術オープンイノベ
ーションラボラトリ

CFRP processing with short wavelength pulsed laser

Advanced Industrial
Science andTechnology
Advanced Industrial
Science andTechnology

134

〃

北條

真之

京都大学

大学院理学研究科〃

Masayuki Hojo

Kyoto University

135

〃

高橋

伸弥

京都大学

大学院理学研究
科〃

Shinya Takahashi

Kyoto University

136

〃

内田

健人

京都大学

大学院理学研究科〃

Kento Uchida

Kyoto University

ISSP Activity Report 2020

137

青色半導体レーザー用ファイバ型光コンバイナの
藤本
開発

靖

千葉工業大学工学部 電気電 Development on fiber power combiner for GaN semiconductor
Yasushi Fujimoto
lasers子工学科

138

半導体におけるフェムト秒レーザー加工に表面粗富田さが与える影響

卓朗

徳島大学

徳島大学

賢哉

徳島大学

大学院創成科学
研究科

誠

秋田大学

岡田

達也

時間分解非線形分光法を用いた酸化物薄膜のコヒ
牧野ーレントフォノンの励起エネルギー依存性

139
140

〃

フェムト秒レーザー加工における固体材料の構造
山口
変化に関する研究141〃

担当所員：板谷
142

111

143

坂東

Influence of surface roughness on femtosecond laser
processing of semiconductors

Chiba Institute ofTechnology (CIT)

Takuro Tomita

Tokushima University

Kenya Bando

Tokushima University

大学院理工学研 Study on structural change of solid materials in femtosecond
laser processing
究科

Makoto Yamaguchi

Akita University

徳島大学

大学院 社会産業理工学研究部

Tatsuya Okada

Tokushima University

哲征

福井大学

学術研究院工学 Excitation energy dependence of coherent phonons in oxidethin films studied by time-resolved nonlinear spectroscopy
系部門

Takayuki Makino

University of Fukui

拓真

福井大学

大学院工学研究
科

Takuma Yamaguchi

University of Fukui

〃

〃

治郎

〃

山口

〃

112

No.

課題名

144

〃

ISSP Activity Report 2020

担当所員：岡﨑

氏名

NameOrganization

大学院工学研究科

理化学研究所

放射光科学研究 Investigation of the photo-induced insulator-to-metal transition
Yuya Kubota
in an exitonic insulator Ta2NiSe5 and a Mott insulator Ca2RuO4
センター

RIKEN SPring-8 Center

貴司

早稲田大学

理工学術院
進理工学部

Takashi Mizokawa

Waseda University

浩

大阪大学

大学院生命機能 Photo-induced phase transition dynamics on the SmS by
TrARPES
研究科

Hiroshi Watanabe

Osaka University

上智大学

機能創造理工学 Photoemission spectroscopy of electron-doped T'-cuprate
superconductors
科

Zhang Weilu

Sophia University

孝寛

名古屋大学

シンクロトロン Spin- and angle-resolved photoemission study of Graphene on
Takahiro Ito
光研究センター Hex-Au(100) reconstructed surface

Nagoya University

健〃

Ken Suzuki

University of Fukui

浩三
久保田

146 励起子絶縁体における超高速電荷ダイナミクス

溝川

147

時間分解光電子分光法を用いた SmS における光渡邊
誘起相転移ダイナミクスの研究

148

T' 構造をもつ銅酸化物高温超伝導体の角度分解
光電子分光による研究

149

Title

福井大学

鈴木

励起子絶縁体 Ta2NiSe5 及びモット絶縁体
145 Ca2RuO4 における光誘起絶縁体 - 金属転移の研究担当所員：近藤

所属

雄也

チャン
イル

ウェ

先

Ultrafast charge dynamics in excitonic insulators

猛

Hex-Au(100) 再構成表面上グラフェンのスピン分
伊藤
解角度分解光電子分光

150

〃

古田

貫志

名古屋大学

大学院工学研究
科〃

Kanji Furuta

Nagoya University

151

〃

細谷

知輝

名古屋大学

大学院工学研究
科〃

Tomoki Hosoya

Nagoya University

152

〃

松永

和也

名古屋大学

大学院工学研究科〃

Kazuya Matsunaga

Nagoya University

153

〃

山本

凌

名古屋大学

大学院工学研究科〃

Ryo Yamamoto

Nagoya University

小林

正起

東京大学

大学院工学系研 Thickness-dependence of topological surface in topologicalinsulator Bi/perpendicular ferromagnet MnGa heterostructure
究科

Masaki Kobayashi

The University ofTokyo

トポロジカル絶縁体 Bi/ 垂直磁化膜 MnGa ヘテ
154 ロ構造における Bi 膜厚に依存したトポロジカル
表面状態

一般研究員・大阪大学 先端強磁場科学研究センター / General Researcher・Center for Advanced High Magnetic Field Science Osaka University
No.
1
2

課題名

氏名

頂点及び辺共有した四面体を有する低次元物質の
浅野
強磁場物性
〃

西首

所属

Title

Name

Organization

貴行

福井大学

学術研究院工学 High-field properties of low-dimensional materials with cornerTakayuki Asanoand edge-sharing tetrahedron
系部門

University of Fukui

時夫

福井大学

大学院工学研究
科

University of Fukui〃

Tokio Nishikubi

No.

課題名

氏名

3

磁気力の半径方向成分によるタンパク質結晶の磁牧
気浮上と熱物性値計測

4

有機ラジカル系から成る量子スピン系の強磁場磁山口
性

5

希土類ワイル物質の強磁場下輸送特性の研究

6

所属

Title

Name

Organization

岡山理科大学

フロンティア理 Magnetic levitation and thermal property measurement ofprotein crystals by the radial component of magnetic force
工学研究所

Syou Maki

Okayama University of
Science博則

大阪府立大学

大学院理学系研 High-field magnetic properties of quantum spin systems
composed of organic radicals
究科

Hironori Yamaguchi

Osaka Prefecture
University

寛

大阪大学

大学院理学研究
High-magnetic-field studies of the rare-earth Weyl materials
科

Hiroshi Murakawa

Osaka university

強いスピン - 軌道相互作用を活かした酸化物スピ
松野
ントロニクス丈夫

大阪大学

大学院理学研究
Oxide spintronics utilizing strong spin-orbit coupling科

Matsuno Jobu

Osaka University7

新規低次元遷移金属配位高分子の構造とその量子
本多
磁性の解明

善太郎

埼玉大学

大学院理工学研 Crystal structures and quantum-magnetism of novel lowdimensional transition metal coordination polymers
究科

Zentaro Honda

Saitama University8

量子スピン系の電場励起 ESR と方向二色性

尚次郎 東北大学

金属材料研究所

Electric dipole spin resonance and directional dichroism of the
Shojiro Kimura
quantum spin systems

Tohoku University9

層状強磁性体 CrGeTe3 の磁気特性におけるキャ酒井
リアドープ効果の解明

英明

大阪大学

大学院理学研究 Study of the magnetic properties for carrier-doped layered
ferromagnet CrGeTe3
科

Hideaki Sakai

Osaka University

雅起

大阪大学

大学院理学研究科〃

Masaki Kondo

Graduate Schoolof Science Osaka
University

大阪大学

大学院理学研究科〃

Maeshiro Ryusei

Osaka University〃

Shunya Sakaguchi

Osaka University

祥

村川

木村

ISSP Activity Report 2020

113

10

〃

近藤

11

〃

真栄城

12

〃

阪口

駿也

大阪大学

大学院理学研究科

13 パルス強磁場用極低温実験装置の開発

野口悟

大阪府立大学

大学院理学系研
Development of the cryostat for pulsed high magnetic field
究科

Satoru Noguchi

Osaka Prefecture
University

14

中川

豪

大阪府立大学

大学院理学系研
究科

Takeshi Nakagawa

Osaka Prefecture
University

15 正四角台塔反強磁性体の強磁場 ESR

木村

健太

東京大学

大学院新領域創 High-field ESR measurements of square-cupola-based
antiferromagnets
成科学研究科

Kenta Kimura

The University of
Tokyo

16

赤木

暢

神戸大学

分子フォトサイエンス研究センター

Mitsuru Akaki

Kobe University

17 高温超伝導体のパルス強磁場下電流電圧特性

掛谷

一弘

京都大学

大学院工学研究 Current-voltage characteristics in high-Tc superconductors
under pulsed high magnetic fields
科

Itsuhiro Kakeya

Kyoto University

18 REFe2O4 の磁化測定 (RE=Tm, Lu)

掛谷

一弘

京都大学

大学院工学研究
Magnetization measurement in REFe2O4 (RE=Tm, Lu)科

Itsuhiro Kakeya

Kyoto University

19

田中

勝久

京都大学

大学院工学研究
科

Katsuhisa Tanaka

Kyoto University

〃

〃

〃

竜生

〃

〃

〃

114

No.

課題名

20

三角格子反強磁性体 CuFeO2 の圧力下強磁場磁
化過程

氏名

所属

Title

Name

Organization

ISSP Activity Report 2020

赤木

暢

神戸大学

分子フォトサイ
High-field magnetization under high-pressure in triangular
エンス研究セン
antiferromagnet CuFeO2
ター

Mitsuru Akaki

Kobe University

21 パルス強磁場を用いた圧力下 ESR 装置の開発

櫻井

敬博

神戸大学

研究基盤センタ Development of high-pressure ESR system using pulse highmagnetic fieldーTakahiro Sakurai

Kobe University

22

赤木

暢

神戸大学

分子フォトサイエンス研究センター

Mitsuru Akaki

Kobe University

英樹

上智大学

理工学部

Hideki Kuwahara

Sophia University〃

Mitsuru Akaki

Kobe University〃

Takumi Shirasaki

Sophia University

23〃

CaBa(Co1-xFex)4O7 (0 ≤ x ≤ 1) 単結晶試料の強磁
桑原
場下での磁化・電気分極・ESR 測定〃
Magnetization, electric polarization, and ESR measurements
for CaBa(Co1-xFex)4O7 (0 ≤ x ≤ 1) single crystals in pulsed highmagnetic fields

24

〃

赤木

暢

神戸大学

分子フォトサイエンス研究セン
ター

25

〃

白崎

巧

上智大学

大学院理工学研
究科

智之

大阪大学

大学院工学研究 Research for time dependence of martensitic transformation by
Tomoyuki Terai
using pulse magnet
科

雄亮

東北大学

金属材料研究所

東北大学

大学院理学研究科

26

パルス強磁場によるマルテンサイト変態の時間依
寺井存性に関する研究27 三角格子反強磁性体の強磁場 ESR

南部

28

唐

〃

一飛

Electron spin resonance under high magnetic fields on atriangular antiferromagnet

Osaka University

Yusuke Nambu

Tohoku University〃

Yifei Tang

Tohoku University

29

ホイスラー合金 _Ni2MnX(X = Al, Sb) および左近
Pd2MnSn の磁化・磁歪の高速磁場応答性の研究

拓男

龍谷大学

先端理工学部

Research on time dependences of magnetstriction of Ni2MnX(X = Al, Sb) type and Pd2MnSn type Heusler alloys

Takuo Sakon

Ryukoku University

30

ナノ構造を導入した希土類系高温超伝導薄膜にお土屋ける強磁場中臨界電流密度に関する研究

雄司

名古屋大学

工学部電気工学 Study on the critical current density in high-magnetic field in
RE-based cuprate superconductors with nano-structure
専攻

Yuji Tsuchiya

Nagoya University

Name

Organization

物質合成・評価設備 G クラス / Materials Synthesis and Characterization G Class Researcher
No.
1

課題名
超臨界水中の固体触媒の劣化挙動解明と再生

氏名
秋月

信

所属

Title

東京大学

大学院新領域創 Elucidation and regeneration of solid catalyst deterioration
behavior in supercritical water
成科学研究科

Makoto Akizuki

The University of
Tokyo

東京大学

大学院新領域創成科学研究科Chen Wenjing

The University ofTokyo

Tetsuji Saito

Chiba Institute ofTechnology

Makoto Akizuki

The University of
Tokyo

2

〃

チン
イ

ブンセ

3

新規希土類磁石の構造解析

齋藤哲治

千葉工業大学

工学部

4

超臨界二酸化炭素、塩水、岩石間の相互作用が起秋月きる場の基礎的理解

信

東京大学

大学院新領域創 Research on the fundamentals of the interaction amongsupercritical carbon dioxide, brine, and rock
成科学研究科〃Study of new rare-earth magnets

No.

課題名

5

〃

6

氏名
外野

圭太

材料形態制御によるクリーンエネルギーデバイス
細野
開発

英司

7

〃

太田

道広

8

〃

プリヤンカ
ジュド

9

〃

三石

雄悟

所属
東京大学

大学院新領域創成科学研究科

Title

Name

Organization〃

Keita Hokano

The University ofTokyo

Eiji Hosono

National Institute ofAdvanced Industrial
Science and Technology

Michihiro Ohta

National Institute ofAdvanced Industrial
Science and Technology

Priyanka Jood

National Institute ofAdvanced Industrial
Science and Technology

Yugo Miseki

National Institute ofAdvanced Industrial
Science and Technology

ゼロエミッショDevelopment of clean energy devices by morphology control
産業技術総合研
ン国際共同研究of materials
究所
センター
ゼロエミッショ
産業技術総合研〃
ン国際共同研究究所
センター
ゼロエミッショ
産業技術総合研〃
ン国際共同研究究所
センター
ゼロエミッショ
産業技術総合研〃
ン国際共同研究
究所
センター

10

Nd1-xCaxFeO3 (0.1 ≦ x ≦ 0.9) の高温における磁中津川性と熱電特性に関する研究

博

横浜国立大学大学院 工学研究 Magnetism and thermoelectric properties at high temperature
in Nd1-xCaxFeO3 (0.1 ≦ x ≦ 0.9)
院

Hiroshi Nakatsugawa

Yokohama National
University

11

層間チューニングされたハニカム格子イリジウム
原口
酸化物の物性解明

祐哉

東京農工大学

大学院工学研究 Study of physical properties on interlayer-tuned honeycomb
lattice iridium oxides
院

Yuya Haraguchi

Tokyo Unversityof Agriculture andTechnology

有海大樹

東京農工大学

大学院工学府

Hiroki Arikai

新しい Pr4+ 系キタエフ - ハイゼンベルグ型磁性香取体の探索と磁性浩子

東京農工大学

大学院工学研究 Search and magnetism of new Pr4+ Kitaev-Heisenberg typemagnets
院

Hiroko Katori

東京農工大学

大学院工学府

Yutaka Kobiki

Tokyo Univesityof Agriculture andTechnology

出

鹿児島大学

大学院理工学研 Study on analysis of half-metallic Heusler alloys by the spin
fluctuation theory of itinerant electron ferromagnets
究科

Iduru Shigeta

Kagoshima University

横山

喬亮

鹿児島大学

大学院理工学研
究科

Takaaki Yokoyama

Kagoshima University

17 ホイスラー化合物での反強磁性の研究

廣井

政彦

鹿児島大学

大学院理工学研
Study on antiferromagnetism in Heusler compounds
究科

Masahiko Hiroi

Kagoshima University

18

赤石

幸起

鹿児島大学

大学院理工学研
究科

Kouki Akaishi

Kagoshima University

有機伝導体の磁化測定によるモットおよびディラ
宮川
ック物理の研究和也

東京大学

大学院工学系研 Study of Mott and Dirac physics in organic conductors bymagnetization measurements
究科

Kazuya Miyagawa

The University of
Tokyo

12
13
14

ISSP Activity Report 2020

15
16

19

〃

〃

小日置

ハーフメタルホイスラー合金の遍歴電子強磁性体
重田のスピンゆらぎ理論による解析に関する研究
〃

〃

隆

〃

〃

〃

〃

Tokyo Unversityof Agriculture andTechnology

Tokyo Universityof Agriculture andTechnology

115

20 新規遷移金属珪化物の超高圧合成

丹羽

健

名古屋大学

大学院工学研究
High-pressure synthesis and novel transition metal silicide科

Ken Niwa

Nagoya University

21

高野

航一

名古屋大学

大学院工学研究
科

Koichi Takano

Nagoya University

〃

〃

116

No.
22

ISSP Activity Report 2020

23
24
25

課題名

氏名

様々な窒素源を用いた前期遷移金属窒化物の高圧
丹羽
合成

28
29

Title

Name

Organization

健

名古屋大学

大学院工学研究 High-pressure synthesis of early transition metal nitrides using
Ken Niwa
various nitrogen source科

Nagoya University

秀斗

名古屋大学

大学院工学研究
科

Shuto Asano

Nagoya University

名古屋大学

大学院工学研究 High-pressure synthesis and characterization of aluminate
phosphors with AeAl2O4 as a host structure科

Takuya Sasaki

Nagoya University

名古屋大学

大学院工学研究
科

Shinsuke Kondo

Nagoya University

名古屋大学

大学院工学研究 High-pressure synthesis of aluminosilicate phosphors underhigh pressure and high temperature科

Takuya Sasaki

Nagoya University

一晃

名古屋大学

大学院工学研究
科

Kazuaki Tateiwa

Nagoya University

ハロゲン化アンモニウムを用いた新規遷移金属窒佐々木 拓也
化物の高圧合成

名古屋大学

大学院工学研究 High-pressure synthesis of transition-metal nitrides using
ammonium halide
科

Takuya Sasaki

Nagoya University

名古屋大学

大学院工学研究
科

Koki Noda

Nagoya University

Nico Alexander
Gaida

Nagoya University〃

浅野

アルミン酸塩 AeAl2O4 を母体とした新規蛍光体
佐々木の高圧合成と評価
〃

拓也

近藤

信介

26 高温高圧下におけるアルミノ珪酸塩蛍光体の創製 佐々木
27

所属

〃

〃

30 マグネシウムシリサイドの相関係

拓也

立岩

野田

航希

ニコ アレキサ名古屋大学
ンダー ガイダ〃〃〃
Phase relations in magnesium silicide

ちひろ

室蘭工業大学

大学院工学研究 Search for new flled-skutterudite compounds exhibit multipole
Chihiro Sekineordering
科

Muroran Instiute ofTechnology

上野公輔

室蘭工業大学

大学院工学研究
科

Kosuke Ueno

Muroran Instiute ofTechnology

33 超臨界水を用いた金属酸化物微粒子の合成

秋月

信

東京大学

大学院新領域創 Synthesis of metal oxide nanoparticles using supercriticalwater
成科学研究科

Makoto Akizuki

The University of
Tokyo

34

シュソウコン

東京大学

大学院新領域創成科学研究科

Zhenghui Zhu

The University of
Tokyo

東京大学

大学院新領域創 In-situ organic modification of composite metal oxide particles
Makoto Akizuki
using supercritical hydrothermal method
成科学研究科The University of
Tokyo

東京大学

大学院新領域創成科学研究科Xue LiThe University of
Tokyo

東京大学

大学院新領域創 Improving stability of microporous materials for biomass
upgrading in sub- and supercritical water
成科学研究科Yoshito Oshima

The University of
Tokyo

東京大学

大学院新領域創成科学研究科Apibanboriak
Chanwit

The University of
Tokyo

31
32

35
36
37
38

多極子転移を示す充填スクッテルダイト化合物の
関根
新物質探索

工学部

〃

〃

〃

超臨界水熱合成法を利用した複合金属酸化物微粒
秋月子のその場有機修飾技術の研究〃

李高温高圧水中でのバイオマス変換に使用するマイ大島
クロポーラス材料の安定性向上
〃

信
雪
義人

アピバンボリラク チャン
ウィット

〃

〃

〃

〃

No.
39

課題名

メソポーラスマテリアル・グラフェンオキサイド佐々木に担持した金属触媒のキャラク タリゼーション

40 一次元テルル化物における超伝導
41
42
43

氏名

Title

Name

Organization

岳彦

東京大学

大学院新領域創 Characterization of metal catalysts supported on mesoporous
materials and graphene oxide
成科学研究科

Takehiko Sasaki

The University of
Tokyo

佳比古

名古屋大学

大学院工学研究Superconductivity in one-dimensional tellurides
科

Yoshihiko Okamoto

Nagoya University

名古屋大学

High pressure synthesis, crystal chemistry and physical
大学院工学研究
properties of novel transition metal nitrides and related科
compounds

Masashi Hasegawa

Nagoya University

仲景

名古屋大学

大学院工学研究科

Chang Chung Ching

Nagoya University

誠

大阪大学

レーザー科学研 Single crystal growth for Samarium rare-earth orthoferrite and
Makoto Nakajima
ultrafast control of magnetization by terahertz pulses
究所

Osaka University

岡本

新規遷移金属窒化物関連物質の超高圧合成と結晶
長谷川
化学および物性〃所属

張サマリウム系希土類オルソフェライト単結晶成長
中嶋とテラヘルツ波による磁化制御

正

〃

44

〃

マグ ウサラバリン カトリ 大阪大学
ン ペンダン

レーザー科学研究所〃

Pendang Valynn
Katrine Magsara

Osaka University

45

〃

小池

〃

Yohei Koike

Osaka University46

新規フェロイック物質開発・物性開拓に関する研
木村
究

遥平

大阪大学

レーザー科学研
究所

剛

東京大学

大学院新領域創Investigation of new ferroic materials and phenomena
成科学研究科Tsuyoshi Kimura

The University of
Tokyo

ISSP Activity Report 2020

47

〃

木村 健太

東京大学

大学院新領域創成科学研究科〃

Kenta Kimura

The University of
Tokyo

48

〃

林田

健志

東京大学

大学院新領域創成科学研究科〃

Takeshi Hayashida

The University of
Tokyo

49

〃

三澤

龍介

東京大学

大学院新領域創成科学研究科物質系専攻〃

Ryusuke Misawa

The University of
Tokyo

50

〃

姜

東京大学

大学院新領域創成科学研究科〃kang sanThe University of
Tokyo

51

〃

八木

直輝

東京大学

大学院新領域創成科学研究科〃

Naoki Yagi

The University of
Tokyo

52

〃

大島

貴彦

東京大学

大学院新領域創成科学研究科〃Takahiko Oshima

The University of
Tokyo

53

〃

林

東京大学

大学院新領域創成科学研究科〃Yuki Hayashi

The University of
Tokyo

山

悠生

117

54 外場制御可能な磁気超構造を有する物質の開発

有馬

孝尚

東京大学

大学院新領域創 Exploration of materials hosting controllable magnetic
superstructure
成科学研究科Taka-hisa Arima

The University of
Tokyo

55

徳永

祐介

東京大学

大学院新領域創成科学研究科

Yusuke Tokunaga

The University of
Tokyo

〃

〃

118
ISSP Activity Report 2020

No.

課題名

氏名

所属

56

〃

近江

毅志

東京大学

57

〃

佐藤

樹

58

〃

59

Title

Name

Organization

大学院新領域創成科学研究科〃Tsuyoshi Omi

The University of
Tokyo

東京大学

大学院新領域創成科学研究科〃

Tatuki SatoThe University of
Tokyo

荒木 勇介

東京大学

大学院新領域創成科学研究科〃

Yusuke Araki

The University of
Tokyo

〃

海本 祐真

東京大学

大学院新領域創成科学研究科〃Yuma Umimoto

The University of
Tokyo

60

〃

渡辺

東京大学

大学院新領域創成科学研究科〃Yoshito Watanabe

The University of
Tokyo

61

〃

蘇丹

東京大学

大学院新領域創成科学研究科〃Su DanThe University of
Tokyo

62

〃

柳内

晃

東京大学

大学院新領域創成科学研究科〃

Hikaru Yagiuchi

The University of
Tokyo

63

〃

磯貝

レオナ

東京大学

大学院新領域創成科学研究科〃Leona Isogai

The University of
Tokyo

64

〃

吉田 健斗

東京大学

大学院新領域創成科学研究科〃

Kento Yoshida

The University of
Tokyo

65

〃

柳田 真佑

東京大学

大学院新領域創成科学研究科

〃Shinsuke Yanagida

The University of
Tokyo

尚幸

名古屋大学

大学院工学研究 Study of lattice dynamics at the plastic crystal state in
vanadium chalcogenides
科

Naoyuki Katayama

Nagoya University

小島

慶太

名古屋大学

大学院応用物理学専攻

Keita Kojima

Nagoya University

バルク材料への負の圧力印可を可能とする新しい片山
圧力技術の開発尚幸

名古屋大学

大学院工学研究 Development of novel pressure technique which enables toapply negative pressure on bulk materials
科

Naoyuki Katayama

Nagoya University

塩見

学

名古屋大学

工学部

Manabu Shiomi

Nagoya University

車地

崇

東京大学

大学院新領域創 Exploration of materials hosting controllable magnetic
superstructure
成科学研究科Takashi Kurumaji

The University of
Tokyo

66
67
68
69

バナジウムカルコゲナイドにおける柔粘性結晶の片山
ダイナミクス
〃〃70 外場制御可能な磁気超構造を有する物質の開発

義人

〃

〃

No.

課題名

氏名

所属

Title

Name

Organization

物質合成・評価設備 U クラス / Materials Synthesis and Characterization U Class Researcher
No. 課題名1

所属

超臨界水を用いた rGO/NiFe2O4 ナノコンポジッ
布浦トの合成の検討

2
3

氏名

〃

Teppei Nunoura

The University of
Tokyo

東京大学

大学院新領域創成科学研究科Yang Jiongmei

The University of
Tokyo

東京大学

Solubility and site occupancy of hydrogen in Fe-Si system
大学院理学系研using in-situ neutron diffraction measurement under high究科
pressure and high temperature conditions

Hiroyuki Kagi

The University of
Tokyo

力

東京大学

大学院理学系研
究科〃

Chikara Shito

The University of
Tokyo

悠一郎

東京大学

大学院理学系研
究科〃

Yuichiro Mori

The University of
Tokyo

鉄兵

東京大学

Development of a two-stage catalytic cracker and reformer
環境安全研究セ
for hydrogen production in supercritical water gasification ofンター
biomass with high lipid content

Teppei Nunoura

The University of
Tokyo

ダイアン
グバタンガ

東京大学

新領域創成科学研究科

Diane Gubatanga

The University of
Tokyo

奥村

曉

名古屋大学

宇宙地球環境研 Development of the focal plane instrument of a ground-based
gamma-ray telescope
究所

Akira Okumura

Nagoya University

ヨウ
ミ

ジョン

市東

5

〃

森

裕之

〃

高脂質含有バイオマスの超臨界水ガス化における
布浦
水素生産のための 2 段階接触分解装置と改質装

8〃
地上ガンマ線望遠鏡の焦点面検出器の開発

Organization

環境安全研究セ Study on rGO/NiFe2O4 nanocomposite synthesis insupercritical water
ンター

高温高圧下中性子回折測定による鉄−ケイ素系で鍵の水素原子のサイト決定と溶存量の測定

7

Name

東京大学

鉄兵

4

6

Title

〃

〃

ISSP Activity Report 2020

9

〃

黒田

裕介

名古屋大学

大学院理学研究科〃

Yusuke Kuroda

Nagoya University

10

〃

芳賀

純也

名古屋大学

大学院理学研究
科〃

Junya Haga

Nagoya University

11 MOF を鋳型とした極細無機ナノワイヤーの創製 北尾

岳史

東京大学

大学院新領域創
Synthesis of ultrathin inorganic nanowire templated by MOFs
成科学研究科Takashi Kitao

The University ofTokyo

12 α -RuI3 の高圧合成

今井

良宗

東北大学

大学院理学研究High pressure synthesis of α -RuI3
科

Yoshinori Imai

Tohoku University

Hideyuki Fujihara

Tohoku University

Masato Kotsugi

Tokyo University ofscience

119

13

〃

藤原

秀行

東北大学

大学院理学研究科14

レアメタルフリー磁性材料 L10-FeCo の磁気特
性の解析

小嗣

真人

東京理科大学

基礎工学部

15

〃

熊谷

卓也

東京理科大学

基礎工学部〃

Takuya Kumagai

Tokyo University ofscience

16

〃

宮下

拓也

東京理科大学

基礎工学部〃

Takuya Miyashita

Tokyo University ofscience〃
Analysis of magnetic properties of rare-metal-free supermagnet "L10-FeCo”

120
ISSP Activity Report 2020

No.

課題名

氏名

所属

17

〃

中尾

太一

東京理科大学

18

〃

齋藤

彪我

19

〃

宇田

Title

Name

Organization

基礎工学部

〃

Taichi Nakao

Tokyo University ofscience

東京理科大学

基礎工学部〃

Hyuga Saito

Tokyo University ofscience

浩一

東京理科大学

基礎工学部〃

Koichi Uda

Tokyo University ofscience

20 新規トポロジカル超伝導体の物質合成と物性評価 水上

雄太

東京大学

大学院新領域創 Synthesis and characterization of novel topologicalsuperconductors
成科学研究科Yuta Mizukami

The University of
Tokyo

21

〃

向笠

清隆

東京大学

大学院新領域創成科学研究科〃Kiyotaka Mukasa

The University of
Tokyo

22

〃

石原

滉大

東京大学

大学院新領域創成科学研究科〃

Kota Ishihara

The University of
Tokyo

Title

Name

Organization

長期留学研究員 / Long Term Young Researcher
No.

課題名

氏名

所属

1

発光量絶対値測定系を用いたイクオリンの発光量
小野
子収率の測定

稜平

群馬大学

理工学府

2

銅と有機分子界面におけるバンド状態の巨大スピ
下澤
ン分裂の直接観測皐介

東京理科大学3

金属と有機分子界面におけるラシュバ分裂の増大 小久保

東京理科大学裕太

Measurement of luminescence quantum yield of aequorin
using calibrated total-photon flux spectrometer

Ryohei Ono

Gunma University

大学院理工学研 Direct observation of giant spin splitting band on organic
molecules/cooper interface
究科

Kousuke Shimozawa

Tokyo University of
Science理工学部

yuta Kokubo

Tokyo University of
ScienceEnhancement of Rashba splitting on molecule/metal interface

令和２年度No.

中性子科学研究施設課題名

共同利用課題一覧 / Joint Research List of Neutron Scattering Researcher 2020
氏名

所属

Title

Name

Organization

・申請装置 4G: GPTASISSP Activity Report 2020

121

1

GPTAS（汎用 3 軸中性子分光器）IRT 課題

佐藤

卓

東北大学

多元物質科学研
IRT project of GPTAS
究所

Taku J Sato

Tohoku University2

磁性準結晶中の隠れた磁気秩序の探索

佐藤

卓

東北大学

多元物質科学研
Hidden magnetic order in magnetic quasicrystals
究所

Taku J Sato

Tohoku University

3

量子スカーミオン励起の探索

佐藤

卓

東北大学

多元物質科学研
Quantum magnetic-skyrmion excitation
究所

Taku J Sato

Tohoku University

4

ハニカムおよびジグザグ格子上の非相反磁気励
起の探索

佐藤

卓

東北大学

多元物質科学研 Nonreciprocal quasiparticles in honeycomb and/or zigzag
magnets
究所

Taku J Sato

Tohoku University

5

a-Cu2V2O7 の非相反マグノンに対する bc 面内
磁場効果

佐藤

卓

東北大学

多元物質科学研 Effect of in-plane magnetic field for the nonreciprocal magnon
Taku J Satoin a-Cu2V2O7
究所

Tohoku University

6

Sr2RuO4 の非弾性散乱

古川

はづき

お茶の水女子大 基幹研究院 自学
然科学系

Inelastic neutron scattering experiments on Sr2RuO4

Hazuki Furukawa

Ochanomizu
University7

強磁性超伝導体における磁性と超伝導の研究

古川

はづき

お茶の水女子大 基幹研究院 自学
然科学系

A study of magnetic state in ferromagnetic superconductors

Hazuki Furukawa

Ochanomizu
University8

空間反転対称性の破れた超伝導体の非弾性散乱

古川

はづき

お茶の水女子大 基幹研究院 自学
然科学系

Inelastic neutron scattering experiments on noncentrosymmetric superconductors

Hazuki Furukawa

Ochanomizu
University

9

YbT2Zn20 (T= 遷移金属 ) の結晶場状態の決定

池田

陽一

東北大学

金属物理学研究 Determination of crystalline electric field level scheme of
YbT2Zn20 (T=transition metal)
所

Yoichi Ikeda

Tohoku University

10

リチウム鉄フェライトにおける非相反マグノン

那波

和宏

東北大学

多元物質科学研
Nonreciprocal magnons in noncentrosymmetric Lithium Ferrite Kazuhiro Nawa
究所

Tohoku University11

量子スピン鎖におけるスピノンラシュバ分裂

那波

和宏

東北大学

多元物質科学研
Spinon Rashba splitting on the quantum spin chain
究所

Kazuhiro Nawa

Tohoku University12反強磁性体 CeNiC2 の磁気構造

郷地

順

東京大学

物性研究所

Magnetic structure of antiferromagnetic compound CeNiC2

Jun Gouchi

The University of
Tokyo

13

強誘電体の相転移機構（変位型及び秩序−無秩序重松型）に関する統一的理解の確立

宏武

山口大学

教育学部

Establishment of the unified explanation about the phasetransition mechanism (displacive and order-disorder)

Hirotake Shigematsu Yamaguchi University

14

スピンアイスにおけるトポロジカル相転移

門脇広明

東京都立大学

理工学研究科物
Topological phase transition in spin ice
理学専攻

Hiroaki Kadowaki

Tokyo Metoropolitan
University

15

電気磁気交差相関現象を示す重い電子系反強磁性体 Ce3TiBi5 の磁気構造

阿曽

尚文

琉球大学

Magnetic structure in a heavy fermion antiferromagnet
理学部物質地球
Ce3TiBi5 exhibiting electromagnetic cross-correlation
科学科
phenomenon

Naofumi Aso

University of the
Ryukyus

122

No.

課題名

16

価数揺動希土類化合物における電荷・フォノン
結合現象の検証

氏名

所属

Title

Name

Organization

ISSP Activity Report 2020筒井智嗣

高輝度光科学研 放射光利用研究 Investigation of valence-phonon coupling in valence fluctuation
Satoshi Tsutsuicompounds
究センター
基盤センターJapan Synchrotron
Radiation ResearchInstitute

17

PONTA（高性能偏極中性子散乱装置）IRT 課題 中島

多朗

東京大学

18

MnO 酸化物の磁気相転移とスピンカレントに関
古川
する研究

はづき

19

偏極中性子回折による NaBH4 水溶液中の二水素
吉田
結合の解析

20

YbT2Zn20 (T= 遷移金属 ) の結晶場状態の決定

21

重水素化 CPL-1 に吸着された酸素分子の高エネ
ルギー磁気励起・申請装置 5G: PONTA
IRT project of PONTA

Taro Nakajima

The University ofTokyo

お茶の水女子大 基幹研究院 自学
然科学系

Contribution of magnetism on spin current in MnOHazuki Furukawa

Ochanomizu
University

亨次

福岡大学

理学部

Dihydrogen Bonding in Aqueous NaBH4 Solutions by Polarized
Koji Yoshida
Neutron Diffraction

池田

陽一

東北大学

金属物理学研究 Determination of crystalline electric field level scheme of
YbT2Zn20 (T=transition metal)
所

浅井

晋一郎

東京大学

物性研究所

High-Energy Magnetic Excitation in Oxygen Molecule Adsorbed
Shinichiro Asaiin deuterated CPL-1

The University of
Tokyo

22

Cu2(4-F-bza)4(2-mpyz) に吸着された酸素分子の
浅井
磁気励起

晋一郎

東京大学

物性研究所

Magnetic Excitation in Oxygen Molecule Adsorbed in
Nanoporous Metal Complex Cu2(4-F-bza)4(2-mpyz)

Shinichiro Asai

The University of
Tokyo

23

スピン状態クロスオーバーが起こるダブルペロ
ブスカイト型コバルト酸化物 Sr2CoNbO6 の中性 浅井子非弾性散乱研究

晋一郎

東京大学

物性研究所

Inelastic neutron scattering study for double perovskite cobalt
oxide Sr2CoNbO6

Shinichiro Asai

The University of
Tokyo

24

メイプルリーフ格子物質 MgMn3O7・3D2O の粉
浅井
末中性子回折実験

晋一郎

東京大学

物性研究所

Neutron Diffraction study of Maple Leaf Compound
MgMn3O7・3D2O

Shinichiro Asai

The University of
Tokyo

25

メイプルリーフ格子物質 MgMn3O7・3D2O の中浅井
性子非弾性散乱

晋一郎

東京大学

物性研究所

Inelastic Neutron Scattering of Maple Leaf Compound
MgMn3O7・3D2O

Shinichiro Asai

The University of
Tokyo

26

鉄系超伝導体のスピン揺動

産業技術総合研 省エネルギー研
Spin fluctuations of iron-based superconductors
究所
究部門

Chul-Ho Lee

National Institute ofAdvanced Industrial
Science and Technology27

低次元反強磁性体 Ni2V2O7 の磁場温度相図の決
長谷
定

正司

物質・材料研究 中性子散乱グル Determination of the magnetic phase diagram of the low
dimensional antiferromagnet Ni2V2O7
機構
ープ

Masashi Hase

National Institute forMaterials Science28

磁気冷凍材料 R3RuO7 (R = Nd, Tb) の磁気構造
長谷
の決定

正司

物質・材料研究 中性子散乱グル Determination of the magnetic structures of the magnetic
refrigeration materials R3RuO7 (R = Nd, Tb)
機構
ープ

Masashi Hase

National Institute forMaterials Science

李

哲虎

物性研究所

Yoichi Ikeda

Fukuoka University
Tohoku University

・申請装置 6G: TOPAN
29

TOPAN（東北大理：３軸型偏極中性子分光器 ）藤田
IRT 課題全基

東北大学

金属材料研究所 IRT project of TOPAN

Masaki Fujita

Tohoku University30

偏極中性子非弾性散乱による Tb3Fe5O12 におけ南部るマグノン極性の測定

雄亮

東北大学

金属材料研究所 Magnon polarization in Tb3Fe5O12

Yusuke Nambu

Tohoku University

No.

課題名

氏名

所属

Title

Name

Organization

31

Possible Z2 vortex in the two-dimensional
triangular antiferromagnet FeGa2S4

南部

雄亮

東北大学

金属材料研究所

Possible Z2 vortex in the two-dimensional triangularantiferromagnet FeGa2S4

Yusuke Nambu

Tohoku University

32

近藤半金属におけるワイルフェルミオンの磁気
状態

岩佐

和晃

茨城大学

フロンティア応
用原子科学研究 Magnetic states of Weyl fermion in Kondo semimetals
センター

Kazuaki Iwasa

Ibaraki University

33

YbT2Zn20 (T= 遷移金属 ) の結晶場状態の決定

池田

陽一

東北大学

金属物理学研究 Determination of crystalline electric field level scheme of
YbT2Zn20 (T=transition metal)
所

Yoichi Ikeda

Tohoku University

34

T' 構造銅酸化物 Pr2-xCaxCuO4 における磁気相関藤田と超伝導の研究全基

東北大学

金属材料研究所

Study of spin correlations and superconductivity inT'-structured cuprate oxide Pr2-xCaxCuO4

Masaki Fujita

Tohoku University

IRT project of HER

Takatsugu Masuda

The University ofTokyo・申請装置 C1-1: HER

ISSP Activity Report 2020

35

HER ( 高エネルギー分解能３軸型中性子分光器 )益田
IRT 課題

隆嗣

東京大学

物性研究所

36

量子スカーミオン励起の探索

佐藤

卓

東北大学

多元物質科学研
Quantum magnetic-skyrmion excitation
究所

Taku J Sato

Tohoku University

37

ハニカムおよびジグザグ格子上の非相反磁気励
起の探索

佐藤

卓

東北大学

多元物質科学研 Nonreciprocal quasiparticles in honeycomb and/or zigzag
magnets
究所

Taku J Sato

Tohoku University38

a-Cu2V2O7 の非相反マグノンに対する bc 面内
磁場効果

佐藤

卓

東北大学

多元物質科学研 Effect of in-plane magnetic field for the nonreciprocal magnon
Taku J Satoin a-Cu2V2O7
究所

Tohoku University

39(Ni,Mn)TiO3 のメモリー効果

古川

はづき

お茶の水女子大 基幹研究院 自学
然科学系

Memory effect on spinglass system (Ni,Mn)TiO3

Hazuki Furukawa

Ochanomizu
University40

Ce(Co,Rh)In5 の磁性と超伝導発現機構の関係

古川

はづき

お茶の水女子大 基幹研究院 自学
然科学系

Magnetism and Superconductivity in Ce(Co,Rh)In5

Hazuki Furukawa

Ochanomizu
University

41

近藤半金属におけるワイルフェルミオンの磁気
状態

岩佐

和晃

茨城大学

フロンティア応
用原子科学研究 Magnetic states of Weyl fermion in Kondo semimetals
センター

Kazuaki Iwasa

Ibaraki University

42

T' 構造銅酸化物 Pr2-xCaxCuO4 における磁気相関藤田と超伝導の研究全基

東北大学

金属材料研究所

Masaki Fujita

Tohoku University

43

量子スピン液体の研究

門脇広明

東京都立大学

理工学研究科物
Quantum spin liquid
理学専攻

Hiroaki Kadowaki

Tokyo Metoropolitan
University

44

CeNiSn は topological Kondo insulator なのか？ 門脇広明

東京都立大学

理工学研究科物
Is CeNiSn topological Kondo insulator ？
理学専攻

Hiroaki Kadowaki

Tokyo Metoropolitan
University

東京大学

物性研究所

Xiang LiThe University ofTokyo

Study of spin correlations and superconductivity inT'-structured cuprate oxide Pr2-xCaxCuO4・申請装置 C1-2: SANS-U

123

45

SANS-U（二次元位置測定小角散乱装置）IRT 課
Li
題

Xiang

IRT project of SANS-U

124

No.

課題名

氏名

所属

Title

Name

Organization

ISSP Activity Report 202046

ファージーゲルの伸張下での構造評価

Li

Xiang

東京大学

物性研究所

Simultaneous tensile test and SANS measurements of novel
hybrid gels from polymer and M13 phage

Xiang LiThe University of
Tokyo

47

高均一ゲルの伸張下での空間相関の探求

Li

Xiang

東京大学

物性研究所

Investigation of spatial correlation of highly homogeneous gels
Xiang Li
under elongation

The University of
Tokyo

48

重水素化ラベリングを用いた均一ゲルの構造解
析

Li

Xiang

東京大学

物性研究所

Structure analysis of homogeneous gel with assistance of
deuteration labeling

Xiang LiThe University of
Tokyo

49

選択的ドメイン重水素化と中性子小角散乱によるマルチドメインタンパク質のドメイン運動の
解明

井上

倫太郎

京都大学

Elucidation of domain motions in multi-domain protein
複合原子力科学through selective deuteration-assisted small-angle neutron研究所
scattering.

Rintaro Inoue

Kyoto University50

磁性準結晶中の隠れた磁気秩序の探索

佐藤

卓

東北大学

多元物質科学研
Hidden magnetic order in magnetic quasicrystals
究所

Taku J Sato

Tohoku University51

反転対称性を持つ RGa2 における磁気スキルミオ
南部
ンの探索

雄亮

東北大学

金属材料研究所

Search for magnetic skyrmion in RGa2 with inversion
symmetry

Yusuke Nambu

Tohoku University

52

中性子小角散乱実験による Sr2RuO4 の異常金属
状態の研究

古川

はづき

お茶の水女子大 基幹研究院 自学
然科学系

Anomalous vortex state in Sr2RuO4 studied by SANS
experiments

Hazuki Furukawa

Ochanomizu
University53

空間反転対称性の破れた超伝導体のヘリカル磁束格子の観測古川

はづき

お茶の水女子大 基幹研究院 自学
然科学系

Herical vortex phase on non-centrosymmetric superconductors Hazuki Furukawa

Ochanomizu
University54

強磁性超伝導体における自発的磁束格子構造の
研究

古川

はづき

お茶の水女子大 基幹研究院 自学
然科学系

Spontaneous vortex phase in ferromagnetic superconductors

Ochanomizu
University

55

MnSi における変動電流下の磁気スキルミオン格
奥山
子変形の周波数依存性

大輔

東北大学

多元物質科学研 Frequency dependence of the magnetic skyrmion deformation
Daisuke Okuyama
in MnSi under an alternative electric current flow
究所

Tohoku University

56

マイクロエマルションの角層浸透機構

櫻木

美菜

崇城大学

工学部ナノサイ The penetration mechanism of microemulsions into thestratum corneum
エンス学科

Mina Sakuragi

Sojo UnIversity

57

レゾルシナレン系カプセルの正多面体構造における溶媒依存性藤井翔太

北九州市立大学 環境技術研究所

Solvent dependence of resorcinarene-based capsules on theirplatonic structures and catalytic ability

Shota Fujii

The University of
Kitakyushu

58

中性子散乱法によるブロックポリマー / リン脂質
ハイブリッドベシクル中のナノドメインの構造 西村
解析

智貴

京都大学

工学研究科

Nanodomain formation in oligopeptide-block-poly(propyleneoxide)/phospholipid hybrid vesicles: A contrast-matching
SANS study

Tomoki Nishimura

Kyoto University

59

イミダゾリウム系イオン液体中におけるエタノールクラスターの形成

高椋

利幸

佐賀大学

理工学部

Formation of Ethanol Clusters in Imidazolium-based Ionic
Liquids

Toshiyuki Takamuku Saga University

60

セグメントラベルを活用した中性子小角散乱によるマルチドメイン蛋白質の溶液構造解析

中川洋

日本原子力研究 階層構造研究グ Analysis of solution structure of segment labelled multi-domain
Hiroshi Nakagawa
protein by SANS
開発機構
ループ

Japan Atomic Energy
Agency東京大学

The University ofTokyo

Hazuki Furukawa

・申請装置 C2-3-1: iNSE
61

iNSE（中性子スピンエコー分光器 )IRT 課題

Li

Xiang

物性研究所

IRT project of iNSE

Xiang Li

No.

課題名

氏名

所属

Title

Name

Organization

Hiroshi Nakagawa

Japan Atomic Energy
Agency中川

日本原子力研究 階層構造研究グ Analysis of relationship between structural dynamics andfunction of segment labelled multi-domain protein
開発機構
ループ

セグメントラベルによるマルチドメイン蛋白質の動的構造と機能発現との関係性の解析

洋

63

Ochanomizu
University

左右田

Minoru Soda

MnSi におけるスキルミオンのダイナミクス

お茶の水女子大 基幹研究院自然Dynamics of skyrmion in MnSi
学
科学系

62

稔

・申請装置 C3-1-1: AGNES
64

AGNES（高分解能パルス冷中性子分光器）IRT
課題

山室

修

東京大学

物性研究所

IRT project of AGNES

Osamu Yamamuro

The University of
Tokyo

65

新規水素クラスター物質 Li5MoH11 の速いダイ
ナミクス

山室

修

東京大学

物性研究所

Fast dynamics of novel hydrogen cluster material Li5MoH11

Osamu Yamamuro

The University of
Tokyo

66

新規水素クラスター物質 Li5MoH11 の遅いダイ
ナミクス

山室

修

東京大学

物性研究所

Slow dynamics of novel hydrogen cluster material Li5MoH11

Osamu Yamamuro

The University of
Tokyo

67

アルキルアンモニウム系プロトン性イオン液体の速いダイナミクス

山室

修

東京大学

物性研究所

Fast dynamics of alkylammonium based protic ionic liquids

Osamu Yamamuro

The University of
Tokyo

68

アルキルアンモニウム系プロトン性イオン液体の遅いダイナミクス

山室

修

東京大学

物性研究所

Slow dynamics of alkylammonium based protic ionic liquids

Osamu Yamamuro

The University ofTokyo・申請装置 C3-1-2: MINE1

ISSP Activity Report 2020

69

MINE1（京大複合研：多層膜中性子干渉計・反射率計）IRT 課題

日野

正裕

京都大学

複合原子力科学
MINE1 (Multilayer neutron interferometer and reflectmeter)研究所

Masahiro Hino

Kyoto University70

MINE2（京大複合研：多層膜中性子干渉計・反射率計）IRT 課題

日野

正裕

京都大学

複合原子力科学MINE2 (Multilayer neutron interferometer and reflectmeter)研究所

Masahiro Hino

Kyoto University71

高分子 / 水界面における生体分子の吸着状態の解
松野
析

寿生

九州大学

大学院工学研究 Analyses of adsorbed biomolecules at the polymer/waterinterface
院

Hisao Matsuno

Kyushu University

Kenji Ohoyama

Ibaraki University
Tohoku University

・申請装置 T1-1: HQR

125

72

HQR( 高分解能中性子散乱装置 )IRT 課題

大山

研司

茨城大学

理工学研究科73

重い電子超伝導体 CeNiGe3 の秩序変数の圧力依
池田
存性

陽一

東北大学

金属物理学研究
Pressure dependence of the order parameter in CeNiGe3
所

Yoichi Ikeda

74

Rb2MoO4 における多形転移とソフトフォノン

重松

宏武

山口大学

教育学部

Polymorph Transition and Soft Phonon in Rb2MoO4

Hirotake Shigematsu Yamaguchi University75

強誘電体の相転移機構（変位型及び秩序−無秩序重松型）に関する統一的理解の確立

宏武

山口大学

教育学部

Establishment of the unified explanation about the phasetransition mechanism (displacive and orderdisorder)

Hirotake Shigematsu Yamaguchi University

IRT project of HQR

126

No.

課題名

氏名

所属

Title

Name

Organization

・申請装置 T1-2: AKANEISSP Activity Report 2020

76

AKANE（東北大金研：三軸型中性子分光器 ）IRT 課題

藤田

全基

東北大学

金属材料研究所 IRT project of AKANE

Masaki Fujita

Tohoku University

77

重い電子超伝導体 CeNiGe3 の秩序変数の圧力依
池田
存性

陽一

東北大学

金属物理学研究
Pressure dependence of the order parameter in CeNiGe3
所

Yoichi Ikeda

Tohoku University

78

T' 構造銅酸化物 Pr2-xCaxCuO4 における磁気相関藤田と超伝導の研究全基

東北大学

金属材料研究所

Masaki Fujita

Tohoku University

79

鉄系超伝導体のスピン揺動

産業技術総合研 省エネルギー研
Spin fluctuations of iron-based superconductors
究所
究部門

Chul-Ho Lee

National Institute ofAdvanced Industrial
Science and Technology

李哲虎Study of spin correlations and superconductivity inT'-structured cuprate oxide Pr2-xCaxCuO4・申請装置 T1-3 HERMES80

HERMES（東北大金研：中性子粉末回折装置）
IRT 課題

南部

雄亮

東北大学

金属材料研究所 IRT project of HERMES

Yusuke Nambu

Tohoku University

81

キタエフ候補物質 RuX3 (X = Br, I) の結晶構造
と磁気構造

佐藤

卓

東北大学

多元物質科学研 Crystal and magnetic structure of the possible Kitaevcandidates RuX3 (X = Br, I)
究所

Taku J Sato

Tohoku University

82

Ce(Te1-xGex)3(x˜0.33) の磁気構造解析

小林

理気

琉球大学

理学部

Riki Kobayashi

University of the
Ryukyus83

近藤半金属におけるワイルフェルミオンの磁気
状態

岩佐

和晃

茨城大学

フロンティア応
用原子科学研究 Magnetic states of Weyl fermion in Kondo semimetals
センター

Kazuaki Iwasa

Ibaraki University

84

EuTGe3 (T=Rh, Ir) におけるらせん磁気構造の探
松村
索

武

広島大学

大学院先端物質 Search for a helimagnetic structure of noncentrosymmetric
EuTGe3 (T=Rh, Ir)
科学研究科

Takeshi Matsumura

Hiroshima University

85

T’ 構造銅酸化物の超伝導発現と結晶構造の関係 藤田

全基

東北大学

金属材料研究所

Masaki Fujita

Tohoku University86

電気磁気交差相関現象を示す重い電子系反強磁性体 Ce3TiBi5 の磁気構造

阿曽

尚文

琉球大学

Magnetic structure in a heavy fermion antiferromagnet
理学部物質地球
Ce3TiBi5 exhibiting electromagnetic cross-correlation
科学科
phenomenon

Naofumi Aso

University of the
Ryukyus87

量子臨界点近傍にある YbCo2Zn20 の置換系試料
阿曽の結晶構造と磁気構造

尚文

琉球大学

理学部物質地球 Crystal and magnetic structures in doped systems of
YbCo2Zn20 in vicinity of a quantum critical point
科学科

Naofumi Aso

University of the
Ryukyus

Determination of magnetic structure in Ce(Te1-xGex)3(x~0.33)

Relation between superconducting mechanism and crystal
structure in T’ cuprate oxide

・申請装置 T2-2: FONDER
88

FONDER( 中性子 4 軸回折装置 )IRT 課題

木村

宏之

東北大学

多元物質科学研
IRT proposal for FONDER (Neutron 4-circle diffractometer)
究所

Hiroyuki Kimura

Tohoku University89

塑性歪みを加えた Pt3Fe 反強磁性体における強磁性の発現機構

小林

悟

岩手大学

理工学部

Mechanism of ferromagnetism in plastically deformed Pt3Fe
antiferromagnet

Satoru Kobayashi

Iwate University

No.

課題名

氏名
左右田

稔

所属

Title

Name

お茶の水女子大 基幹研究院自然Magnetic Ordering in Organic Radical Compound C20H14Cl3N4 Minoru Soda
学
科学系

Organization
Ochanomizu
University

90

有機ラジカル分子 C20H14Cl3N4 の磁気秩序

91

マルチフェロイック Tb0.5Gd0.5Mn2O5 における木村
磁気構造と強誘電性の研究

宏之

東北大学

多元物質科学研 Magnetic structure and its relevance to the ferroelectricity inmultiferroic Tb0.5Gd0.5Mn2O5
究所

Hiroyuki Kimura

Tohoku University

92

T'-type Pr2CuO4 における結晶構造の還元効果

木村

宏之

東北大学

多元物質科学研 Oxygen reduction effect on the crystal structure in the T’-structure of Pr2CuO4+y
究所

Hiroyuki Kimura

Tohoku University

93

ジグザグ三角鎖磁性体 Fe2O(SeO3)2 の磁気構造

那波

和宏

東北大学

多元物質科学研
Magnetic structure of the saw-tooth chain magnet Fe2O(SeO3)2 Kazuhiro Nawa
究所

Tohoku University

94

typeIII 型反強磁性体 Pt-Mn における整合ー非整高橋
合磁気相転移

美和子

筑波大学

数理物資系

Commensurate-Incommensurate Magnetic Phase Transition in
Miwako Takahashi
Type-III Anti-ferromagnet Pt-Mn

Tsukuba University

美也

東京大学

物性研究所

IRT project of Accessory

The University ofTokyo・申請装置 Accessory
95

アクセサリー IRT 課題

上床

Yoshiya Uwatoko

ISSP Activity Report 2020

127

128

令和２年度 軌道放射物性研究施設 共同利用課題一覧 / Joint Research List of Syncrotron Radiation Researcher 2020
播磨分室

BL07LSU / Harima Branch BL07LSU

ISSP Activity Report 2020

No.

課題名

1

軟 X 線発光分光測定を用いた生体適合性ポリマ
ーブラシ誘導体に閉じ込められた水分子の電子
状態解析

赤田

圭史

東京大学

2

固体電気化学デバイスのオペランド軟 X 線発光
分光

朝倉

大輔

産業技術総合研 省エネルギー研 Operando soft X-ray emission spectroscopy of solid-stateelectrochemical devices
究所
究部門

3

磁場中共鳴非弾性軟 X 線散乱 (SX-RIXS) による
Co2FeSi ホイスラー合金バルク単結晶の電子状態 梅津
研究

理恵

東北大学

4

高分解能軟 X 線分光を用いた層状遷移金属酸化物における高度蓄電機能と電子状態の相関解析

大久保

5

レドックスフロー電池における触媒活性点のオ
ペランド電子状態解析

大平昭博

産業技術総合研 省エネルギー研 Operando analysis of electronic structure of catalytic active
sites in redox flow batteries
究所
究部門

6

酸素透過時における混合導電性酸化物表面の時
間分解軟 X 線光電子分光測定

籠宮功

名古屋工業大学

Time-resolved soft X-ray core-level spectroscopy on surfaces in
Isao Kagomiya
mixed conductive oxides during oxygen permeation

Nagoya Insutitute ofTechnology

7

酸素透過時における混合伝導体表面の軟Ｘ線雰
囲気光電子分光実験

籠宮功

名古屋工業大学

Ambient pressure X-ray photoelectron spectroscopy on
Isao Kagomiya
surfaces in mixed conductive oxides during oxygen permeation

Nagoya Insutitute ofTechnology

8

X 線吸収分光および発光分光による有機膜と水分
倉橋子の相互作用の評価

直也

東京大学

物性研究所

Analysis of interaction between organic film and watermolecule by x-ray absorption and emission spectroscopy.

Naoya Kurahashi

The University of
Tokyo

9

高分子電解質中の水分子の状態解析研究

直也

東京大学

物性研究所

State analysis study of water molecules in polymer electrolyte Naoya Kurahashi

The University of
Tokyo

10
11

オペランド光電子分光によるプラチナ－酸化パ
ラジウムモデル触媒を用いたメタン転換反応メカニズムの解明
オペランド光電子分光測定によるパラジウム合
金系触媒におけるメタン酸化カップリング反応
の直接観測

氏名

倉橋

將史

所属

東京大学

物性研究所

Title
Analysis of electronic states in water molecules confinedin biocompatible polymer brush derivatives using soft X-ray
emission spectroscopy

Electronic state of bulk-single crystal Co2FeSi Heusler alloy
金属材料研究所 probed by resonant inelastic soft X-ray scattering (SX-RIXS) inmagnetic field
Study on key electronic factors of layered oxides for highperformance charge storage using high-resolution soft x-ray
工学系研究科
spectroscopy

Name

Organization

Keishi Akada

The University ofTokyo

Daisuke Asakura

National Institute ofAdvanced Industrial
Science and Technology

Rie Umetsu

Tohoku University

Masashi Okubo

The University ofTokyo

Akihiro Oohira

National Institute ofAdvanced Industrial
Science and Technology

小板谷

貴典

分子科学研究所

物質分子科学研 Elucidation of the mechanism of methane conversion reaction
Takanori Koitaya
on Pt-PdO model catalysts by operando AP-XPS
究領域

Institute for Molecular
Science

小板谷貴典

分子科学研究所

物質分子科学研 Direct observation of methane oxidative coupling on palladium
Takanori Koitaya
alloy catalysts by operando AP-XPS
究領域

Institute for Molecular
Science

東京大学

大学院工学系研 Unveiling the origin of the p-d exchange interaction in p-type
Mn-doped ferromagnetic semiconductors
究科

Masaki Kobayashi

The University of
Tokyo

12

p 型 Mn ドープ強磁性半導体における p-d 交換相互作用の起源解明

小林

13

単結晶ナノワイヤ正極を用いる二次電池の顕微
光電子マッピングとオペランド測定

張

文雄

東京大学

物性研究所

XPS mapping and operando measurements of LIB using single
Wenxiong Zhang
crystalline nanowires as cathodes

The University of
Tokyo

14

雰囲気 X 線光電子分光による Pd 系合金ナノ粒子
唐表面 CO2 水素化反応過程の解明

佳藝

兵庫県立大学

工学研究科

Ambient-pressure XPS studies of CO2 hydrogenation on Pdbased alloy nanoparticle catalysts

University of Hyogo15

磁性ファンデアワールス・ヘテロ構造における
磁気近接効果の起源の解明

東京大学

大学院工学系研 Elucidation of the origin of the magnetic proximity effect at theMasaki Nakano
magnetic van der Waals heterostructures
究科

中野

正起

匡規

Jiayi TangThe University of
Tokyo

No.

課題名

16

磁性ファンデアワールス・ヘテロ構造におけるフェロバレー状態の観測

中野

匡規

東京大学

大学院工学系研 Observation of a ferrovalley state in the magnetic van der
Waals heterostructures
究科

Masaki Nakano

The University of
Tokyo

17

小角軟 X 線非弾性散乱による Mg 合金中 LPSO
構造形成メカニズムの解明

西堀

麻衣子

九州大学

大学院総合理工 Investigation of LPSO-structure formation mechanism by small
Maiko Nishibori
angle inelastic X-ray scattering
学研究院

Kyushu University18

軟 X 線吸収・発光分光解析による生体親和性高分子界面における中間水の定量評価

西村

慎之介

九州大学

Quantitative evaluation of the interfacial intermediate water on
Shinnosuke
先導物質化学研
biocompatible polymers by soft X-ray absorption and emission
Nishimura究所
spectroscopies

Kyushu University

慈久

東京大学

物性研究所

Improvement of inner-wall coating material for ECMO accelerated
by electronic structure analysis of interfacial water using soft X-ray
emission spectroscopy [coronavirus-related proposal]

Yoshihisa Harada

The University of
Tokyo

慈久

東京大学

物性研究所

Improvement of inner-wall coating material for ECMO accelerated
by electronic structure analysis of interfacial water using soft X-ray
emission spectroscopy (II) [coronavirus-related proposal]

Yoshihisa Harada

The University ofTokyo

Determination of the complex permittivity of thin films ofmagnetic metal by magneto-optical measurement using fastpolarization switching

Yasuyuki Hirata

National Defense
AcademyEiji Hosono

National Institute ofAdvanced Industrial
Science and Technology

Jun Miyawaki

The University of
Tokyo

19
20

氏名

軟 X 線発光分光を用いた界面水分子の電子状態解
析で加速する体外式膜型人工肺（ECMO）配管内壁 原田
コーティング材料の改良【コロナ関連課題】
軟 X 線発光分光を用いた界面水分子の電子状態解
析で加速する体外式膜型人工肺（ECMO）配管内壁 原田
コーティング材料の改良 (II)【コロナ関連課題】

所属

Title

Name

Organization

ISSP Activity Report 2020

21

高速偏光スイッチングを利用した磁気光学測定
による磁性金属薄膜の複素誘電率の決定

平田

靖透

防衛大学校

22

Li 脱挿入による Li-rich/Li-poor2 相ドメイン壁の移動のオペランド顕微光電子マッピング解析

細野英司

Operando/Micro-XPS mapping analysis for domain wall
産業技術総合研 省エネルギー研
migration by two-phase reaction between Li-rich and Li-poor
究所
究部門
phases due to Li insertion and extraction23

共鳴非弾性軟 X 線回折によるサイズ弁別電子状
態解析

宮脇

淳

東京大学

物性研究所

Size-Selective Electronic State Probed by Resonant Inelastic
Soft X-ray Diffraction24

温度応答性高分子が構造変化する分子機構と水
の役割

山添

康介

東京大学

物性研究所

Molecular mechanism of conformation change of temperatureKosuke Yamazoe
responsive polymer and the role of water

The University of
Tokyo

25

軟 X 線オペランド計測の高度化が拓く次世代触
山本
媒科学

達

東京大学

物性研究所

Next Generation Catalysis Science Opened by Sophisticationof Operando Soft X-ray Spectroscopies

Susumu Yamamoto

The University of
Tokyo

26

雰囲気光電子分光で探る遷移金属錯体への水素脱着に伴う化学物性淳

東京大学

大学院新領域創 The transformation of chemical properties of transition metal
complex induced by hydrogen: AP-XPS study
成科学研究科Jun Yoshinobu

The University of
Tokyo

Name

Organization

吉信

柏キャンパス E 棟 / Laser and Synchrotron Research Laboratory in Kashiwa
No.

課題名

氏名

所属

Title

129

1

レーザー角度分解光電子分光を用いた新規ファ
ンデルワールス磁性化合物 GdGaI の微細電子状 岡田
態観測佳憲

沖縄科学技術大
量子物質科学学

2

銅と有機分子界面におけるバンド状態の巨大ス
ピン分裂の直接観測

金井要

東京理科大学

大学院理工学研 Direct observation of giant spin splitting band on organic
molecules/copper interface
究科

3

SARPES を用いた疑一次元超伝導体 TaSe3 にお近藤
けるトポロジカル表面状態の観察

猛

東京大学

物性研究所

SARPES study on topological surfaces states of TaSe3
superconductor

4

SARPES を用いた CDW 物質における ワイル半近藤
金属相の研究

猛

東京大学

物性研究所

Laser-excited angle resolved photoemission study on theelectronic structure for van der Waals magnetic compound
GdGaI

Yoshinori Okada

Okinawa Instituteof Science andTechnology

Kaname Kanai

Tokyo University of
Science

Takeshi Kondo

The University ofTokyo

SARPES study of a new Weyl semimetal of the CDW componds Takeshi Kondo

The University of
Tokyo

130

No.

課題名

氏名
光一郎

所属

Title

物質材料研究機 先端材料解析研
ARPES study of gallium single crystal surface
構
究拠点

Name

ISSP Activity Report 2020

5

Ga 単結晶表面の角度分解光電子分光

矢治

6

疑一次元物質におけるトポロジカル状態のスピ
ンテクスチャーの研究

Ye

7

トポロジカル絶縁体 Bi/ 垂直磁化膜 MnGa ヘテ
ロ構造における Bi 膜厚に依存したトポロジカル
表面状態

小林

正起

東京大学

大学院工学系研 Thickness-dependence of topological surface in topologicalinsulator Bi/perpendicular ferromagnet MnGa heterostructure
究科8

擬一次元ビスマスハライドのトポロジカル表面
状態とバンドギャップ制御

近藤

猛

東京大学

物性研究所

9

Hex-Au(100) 再構成表面上グラフェンのスピン
分解角度分解光電子分光

伊藤

孝寛

名古屋大学

シンクロトロン
Spin- and angle-resolved photoemission study of Graphene on
Takahiro Ito
光科学研究セン
Hex-Au(100) reconstructed surface
ター

Mao

ChineseAcademy of
Sciences

Koichiro Yaji

Study on the spin texture of the topological states in quasi-oneMao Ye
dimensional material
Masaki Kobayashi

Topological surface state and band-gap control in quasi-1D BiTakeshi Kondo
HalidesOrganization
National Institue forMaterials Science
Chinese Academy of
Sciences
The University ofTokyo
The University ofTokyo
Nagoya University令和２年度 スーパーコンピュータ共同利用課題一覧 / Joint Research List of Supercomputer System 2020
No.

課題名

氏名

所属

Title

Name

Organization

1. 第一原理計算 / First‒Principles Calculation of Materials Properties

ISSP Activity Report 2020

1311

高機能スピントロニクス磁性材料の電子構造解
析および電気磁気効果解析

小田竜樹

金沢大学理工研究域数物科学系

Analyses on electronic structure and magnetoelectric effect inhigh-performance spintronics and magnetic materials

Tatsuki Oda

Kanazawa University

2

電気化学界面のシミュレーション

杉野修

東京大学物性研究所

Simulation of electrochemical interfaces

Osamu Sugino

The University of
Tokyo

3

水素の計算物質科学

杉野修

東京大学物性研究所

Computational hydrogenomics

Osamu Sugino

The University of
Tokyo

4

量子論による半導体界面形成機構と電子物性の
解明

押山

淳

名古屋大学未来材料・システム研 Mechanisms of Semiconductor Interface Formation and its
Electronic Properties based on Quantum Theory
究所

Atsushi Oshiyama

5

量子論による半導体界面形成機構と電子物性の
解明

押山

淳

名古屋大学未来材料・システム研 Mechanisms of Semiconductor Interface Formation and its
Electronic Properties based on Quantum Theory
究所

Atsushi Oshiyama

6

表面、界面、欠陥等の複雑構造における原子構
造と原子ダイナミクスに関する解析渡邉聡

東京大学大学院工学系研究科マテ Analyses related to atomic structures and atom dynamics atcomplex structures such as surfaces, interfaces and defects
リアル工学専攻

Satoshi Watanabe

The University of
Tokyo

7

第一原理電子状態・輸送特性計算コード RSPACE
小野の開発とデバイスシミュレーション

倫也

神戸大学大学院工学研究科電気電 Development of first-principles electronic-structure andtransport calculation code RSPACE and simulations for device
子工学専攻

Tomoya Ono

Kobe University

8

第一原理電子状態・輸送特性計算コード RSPACE
小野の開発とデバイスシ ミュレーション

倫也

神戸大学大学院工学研究科電気電 Development of first-principles electronic-structure andtransport calculation code RSPACE and simulations for device
子工学専攻

Tomoya Ono

Kobe University

9

⾼圧⼒下における共有結合性液体・ガラスの構造と電⼦状態の第⼀原理計算

下條冬樹

熊本大学大学院自然科学研究科

First-Principles Molecular-Dynamics Study of Structural andElectronic Properties of Covalent Liquids and Glasses under
Pressure

Fuyuki Shimojo

Kumamoto University

10

⾼機能スピントロニクス磁性材料の電⼦構造解
析および電気磁気効果解析

小田竜樹

金沢大学理工研究域数物科学系

Analyses on electronic structure and magnetoelectric effect inhigh-performance spintronics and magnetic materials

Tatsuki Oda

Kanazawa University11

CeO2（100）でのメタンの酸化反応

横東北大学材料科学高等研究所

Oxidative reaction of CH4 on CeO2(100)Akira Yoko

Tohoku University

12パワー半導体における界面欠陥構造の特定とそ松下の低減法の提案 : 第一原理計算からのアプローチ雄一郎

東京工業大学

Identification of interface-state defects in power
semiconductors: Approach from ab-initio calculations

Yu-ichiro Matsushita

Tokyo Institute ofTechnology

13

量子シミュレーションによる動的不均一触媒理
論

森川

良忠

大阪大学 大学院工学研究科 精密
Quantum simulations on dynamical heterogeneous catalysts
科学・応用物理学専攻

Yoshitada Morikawa

Osaka University14

ベリー位相法による金属強磁性体の異常ホール係数の第一原理計算石井史之

金沢大学ナノマテリアル研究所

First-principles calculation of anomalous Hall coefficient inmetallic ferromagnet by using Berry phase approach

Fumiyuki Ishii

Kanazawa University

15

パワー半導体における界面欠陥構造の特定とその低松下
減法の提案 : 第一原理 計 算からのアプローチ雄一郎

東京工業大学

Identification of interface-state defects in power
semiconductors: Approach from ab-initio calculations

Yu-ichiro Matsushita

Tokyo Institute ofTechnology

哲Institute of Materials
and Systems for
Sustainability
Institute of Materials
and Systems for
Sustainability

132
ISSP Activity Report 2020

No.

課題名

氏名

16

氷惑星および氷衛星内部における 氷物質の熱力
学特性

小松

勇

自然科学研究機構アストロバイオ Thermodynamic properties of icy materials in the interior ofplanets and satelites
ロジーセンター＆国立天文台

17

電子の長距離量子輸送シミュレーションに向けた第一原理アルゴリズムの開発と応用

江上喜幸

北海道大学大学院工学研究院

Development and application of first-principles algorithms forfor long-range electron transport simulation

18

第一原理計算を用いたクラスレート化合物の熱
電特性解析

大西

正人

東京大学機械工学専攻

Analysis of Thermoelectric Properties of Clathrate Compounds
Masato Ohnishiwith Ab Initio Calculations

19

表面、界面、欠陥等の複雑構造における原子構
造と原子ダイナミクスに関する解析渡邉聡

東京大学大学院工学系研究科マテ Analyses related to atomic structures and atom dynamics atcomplex structures such as surfaces, interfaces and defects
リアル工学専攻

20

原子層エッチングプロセスにおける表面反応解
析

浜口

智志

大阪大学工学研究科

21

水素を含む固体の先端計算による水素機能予測

常行

真司

東京大学大学院理学系研究科物理 Prediction of hydrogen function by advanced calculation ofsolids containing hydrogen
学専攻

22

密度汎関数法と溶液理論を用いた電気化学反応
の解析 2

春山

潤

東京大学物性研究所

23

並列計算を用いた計算物質科学とデータ駆動科
学の融合

星

24

GaN 中の不純物 - らせん転位複合体の原子構造と電子構造の第一原理計算による研究

白石

賢二

25

燃料電池電極触媒及び水素透過膜の省貴金属化

坂口

紀史

26

高圧力下における共有結合性液体・ガラスの構
造と電子状態の第一原理 計算

下條

冬樹

27

大規模第一原理電子輸送シミュレーションに向けたアルゴリズム開発と応用

江上

28

遷移金属合金の磁気熱量効果

29

健夫

所属

Title

Analyses of Surface Reactions in Atomic Layer Etching
Processes

Electrochemical reaction analysis using density functional
calculation + implicit solvation model2

鳥取大学大学院工学研究科機械宇 Fusion of computational material science and data-driven
science with parallel computation
宙工学専攻応用数理工学講座
名古屋大学
研究所

Name

Organization

Yu Komatsu

National Institutes of Natural
Sciences AstroBiology Center& National Astronomical
Observatory of Japan

Yoshiyuki Egami

Hokkaido University
The University ofTokyo

Satoshi Watanabe

The University ofTokyo

Satoshi Hamaguchi

Osaka University

Shinji Tsuneyuki

The University ofTokyo

Jun Haruyama

The University ofTokyo

Takeo Hoshi

Tottori University

未来材料・システム First Principles Studies on Atomic and Electronic Structures ofKenji Shiraishi
Impurity-screw dislocation complexes in Gan

Nagoya University

Reduction of Rare Metals in Fuel Cell Catalysts and Hydrogen
Permeable Membrane

Norihito Sakaguchi

Hokkaido University

熊本大学大学院自然科学研究科

First-Principles Molecular-Dynamics Study of Structural andElectronic Properties of Covalent Liquids and Glasses under
Pressure

Fuyuki Shimojo

Kumamoto University

喜幸

北海道大学大学院工学研究院

Development and application of algorithms for large-scale firstYoshiyuki Egami
principles electron-transport simulation

Hokkaido University

小口

多美夫

大阪大学産業科学研究所

Magnetocaloric Effect of Transition-Metal Alloys

Tamio Oguchi

Osaka University

量⼦シミュレーションによる動的不均⼀触媒理
論

森川

良忠

大阪大学 大学院工学研究科 精密
Quantum simulations on dynamical heterogeneous catalysts
科学・応用物理学専攻

Yoshitada Morikawa

Osaka University

30

マルチフィジックスシミュレーションによる半導体気相成長の解明

白石

賢二

名古屋大学
研究所

Kenji Shiraishi

Nagoya University31

表面および界面構造探索手法の開発

山下智樹

長岡技術科学大学

Development of surface and interface structure prediction
methods

Tomoki Yamashita

Nagaoka University ofTechnology32

群論に基づくバンド計算

斎藤峯雄

金沢大学理工研究域数物科学系

Band structure calculation based on the group theory

Mineo Saito

Kanazawa University

北海道大学大学院工学研究院

附属エネル

ギー・マテリアル融合領域研究センター

未来材料・システム Theoretical Studies on Semiconductor MOVPE Growth Basedon Multi-Physics Simulation

No.

課題名

氏名

所属

Title

Kaoru Ohno

Yokohama National
University

Reduction of Rare Metals in Formic Acid Decomposition
Catalysts and Oxygen Storage Materials

Yuji Kunisada

Hokkaido University

ISSP Activity Report 2020

全電子混合基底法プログラムの改良と応用

大野

かおる

34

ギ酸分解触媒及び酸素吸蔵材料の省貴⾦属化

國貞

雄治

35

第一原理計算における Pt(100) 薄膜の強磁性発現
佐藤に関する研究徹哉

慶應義塾大学理工学部

36

結晶構造予測のためのデータ同化手法の開発と水素を含む化合物への応用

常行

真司

Development of data assimilation method for crystal structure
東京大学大学院理学系研究科物理prediction and its application to hydrogen-containing
学専攻
compounds

37「厳密」な第一原理 GW+Bethe-Salpeter 法の開
発

野口

良史

静岡大学工学部

38

双極子近似を超えた光 - 分子相互作用のための第岩佐一原理計算手法の開発と応用

豪

北海道大学

39

フォノンの磁性への影響の理論解析

合田義弘

東京工業大学物質理工学院材料系 Theoretical analysis of influences of phonons on magnetism

40

Ga 添加型永久磁石界面に対する第一原理的研究 立津

慶幸

名桜大学

First-principles study on grain boundaries in Ga-doped
permanent magnets

41

プロトン伝導性酸塩基複合体中の局所構造と分子運動の解析

堀

筑波大学計算科学研究センター

The analysis of the local structures and molecular dynamics in
Yuta Hori
proton-conduction acid-base composites

42

低次元ペロブスカイトにおける励起子自己捕獲現象の第一原理計算

レービガー
ハンネス

横浜国立大学 大学院工学研究院 First principles theory of exciton self-trapping in lowdimensional perovskites
物理工学コース

43

統計物理・第一原理計算連携シミュレーション
による蓄電固体界面の熱力学解析

笠松

山形大学学術研究院

44

自己組織化単分子膜を用いた PbS 量子ドット系のフォノンエンジニアリング

邵

45

第一原理計算・統計物理・機械学習の連携による不規則物質系の物性予測

笠松

46

密度汎関数法と溶液理論を用いた電気化学反応の解析 2-2

春山

47

北海道大学大学院工学研究院

附属エネル

ギー・マテリアル融合領域研究センター

Organization

Improvement and application of all-electron mixed basis
program33

優太

横浜国立大学大学院工学研究院

Name

Study of ferromagnetism in Pt(100) thin films by first-principles
Tetsuya Sato
calculation

Keio University

Shinji Tsuneyuki

The University ofTokyo

Development of Exact First-Principles GW+Bethe-Salpeter
MethodYoshifumi Noguchi

Shizuoka University

Development and applications of first principles methods forlight-matter interactions beyond the dipole approximation

Takeshi Iwasa

Hokkaido University

Yoshihiro Gohda

Tokyo Institute ofTechnology

Yasutomi Tatetsu

Meio University
University of Tsukuba

133

Hannes Raebiger

Yokohama National
University

Thermodynamic analysis of charge-storing interfaces basedon direct coupling of statistical physics and first-principles
calculation

Shusuke Kasamatsu

Yamagata University

東京大学機械工学塩見研究室

Phonon engineering in PbS quantum dot ligand system

Cheng Shao

The University of
Tokyo

秀輔

山形大学学術研究院

Analysis of disordered materials using a combination of firstprinciples calculations, statistical physics, and machinelearning

Shusuke Kasamatsu

Yamagata University

潤

東京大学物性研究所

Electrochemical reaction analysis using density functional
calculation + implicit solvation model 2-2

Jun Haruyama

The University ofTokyo

金属／半導体界面のギャップ状態制御の物理：第中山
一原理計算による研究 II隆史

千葉大学理学部物理学科

First-principles study on physics of gap-state control at metal/
semiconductor interfaces II

Takashi Nakayama

Chiba University48

反転中心の破れた反強磁性体の第一原理電子状
態計算

邦彦

京都大学学際融合教育研究推進セ First-principles electronic structure calculations of noncentrosymmetric antiferromagnets
ンター

Kunihiko Yamauchi

Kyoto University

49

金属 - 絶縁体界面における結合した電子 - フォノ
邵
ン輸送

秀輔
成

山内
成

東京大学機械工学塩見研究室

Coupled electron-phonon transport at metal-insulator interface Cheng Shao

The University of
Tokyo

134

No.

課題名

氏名

所属

Title

Name

Organization

ISSP Activity Report 2020

50

第一原理計算における Pt(100) 薄膜の強磁性発現
佐藤に関する研究徹哉

慶應義塾大学理工学部

Study of ferromagnetism in Pt(100) thin films by first-principles
Tetsuya Sato
calculation

Keio University51

原子層エッチングプロセスにおける表面反応解
析

浜口

智志

大阪大学工学研究科

Analyses of Surface Reactions in Atomic Layer Etching
Processes

Satoshi Hamaguchi

Osaka University

52

分子・金属界面の第一原理計算

濱田

幾太郎

大阪大学工学研究科精密科学・応First-principles study of molecule/metal interfaces
用物理専攻

Ikutaro Hamada

Osaka University

53

高分子系有機半導体の電子状態・界面準位の第一原理的研究柳澤将

琉球大学理学部物質地球科学科物 First-principles theoretical study on the electronic structure
and interface gap states of organic semiconductor polymers
理系

Susumu Yanagisawa

University of the
Ryukyus54

人工ニューラルネットワーク力場構築のための効率的な学習データ生成法の模索 II

島村孝平

熊本大学大学院先端科学研究部

Study of Efficient Training Data Generation Method forConstructing Artificial Neural Network Force Field II

Kohei Shimamura

Kumamoto University

55

第一原理計算による新規二次電池材料の解析

山田淳夫

東京大学工学系研究科

First principles analyses on novel materials for secondary
batteries

Atsuo Yamada

The University of
Tokyo

56

保存則を満たす GW+Bethe-Salpeter 法の開発

野口良史

静岡大学工学部

Development of GW+Bethe-Salpeter method

Yoshifumi Noguchi

Shizuoka University

57

原⼦層⾯内ヘテロ構造・積層構造におけるスピ
ン偏極・擬スピン偏極の ⽣成

明楽浩史

北海道大学大学院工学研究院

Generation of spin and pseudospin polarizations in atomiclayer inplane heterostructures and stacked structures

Hiroshi Akera

Hokkaido University

58

ナノ構造の量⼦伝導の第⼀原理計算

小林伸彦

筑波大学 数理物質系
域First-principles study of quantum transport in nanostructures

Nobuhiko Kobayashi University of Tsukuba

59

氷惑星および氷衛星内部における 氷物質の熱力
学特性

小松

勇

自然科学研究機構アストロバイオ Thermodynamic properties of icy materials in the interior ofplanets and satelites
ロジーセンター＆国立天文台

60

多元系液体鉄合金の超高圧下における構造と輸
送特性

大村

訓史

広島工業大学61

ハイブリッド汎関数による水 / 酸化チタン界面構
大戸造の第一原理シミュレーション

達彦

大阪大学大学院基礎工学研究科

62

量子化学計算を用いた高性能フッ素ポリマーエ
レクトレットの開発

鈴木

雄二

63

第一原理計算による水素化物の準安定固体相および超伝導の探索 II

明石

64

溶媒中の人工網膜分子の物性：第一原理分子動
力学シミュレーション

65
66

物理工学

Yu Komatsu

National Institutes of Natural
Sciences AstroBiology Center& National Astronomical
Observatory of Japan

Structural and transport properties of multi-component liquid
Fe mixtures under high pressure

Satoshi Ohmura

Hiroshima Institute ofTechnology

First-principles molecular dynamics study of water/TiO2
interfaces using hybrid functionals

Tatsuhiko Ohto

Osaka University

東京大学大学院工学系研究科機械 Development of High-performance Polymer Electret Using
Quantum Chemical Analysis
工学専攻

Yuji Suzuki

The University of
Tokyo

遼介

東京大学大学院理学系研究科物理 First principles exploration of the metastable phases of
hydrides and their superconductivity II
学専攻

Ryosuke Akashi

The University of
Tokyo

大村

訓史

広島工業大学

Satoshi Ohmura

Hiroshima Institute ofTechnology

第一原理計算による水素化物の準安定固体相および超伝導の探索明石遼介

東京大学大学院理学系研究科物理 First principles exploration of the metastable phases of
hydrides and their superconductivity
学専攻

Ryosuke Akashi

The University ofTokyo

フォノン及び電子フォノン相互作用の第一原理
精密解析

南谷

英美

分子科学研究所

Emi Minamitani

Institute for Molecular
Science

工学部

工学部

Effects of solvents on properties of artificial-retina molecule:
ab initio molecular dynamics simulations

Ab-initio analysis of phonon and electron-phonon interaction

No.

課題名

氏名

所属

Title

Name

Organization67

二次元物質および表面合金の第一原理計算石井史之

金沢大学ナノマテリアル研究所

First-Principles Calculations of Two-Dimensional Materials andFumiyuki Ishii
Surface Alloys

Kanazawa University

68

永久磁石内部の異相界面に対する第一原理的研
究

立津

慶幸

名桜大学

First-principles study on grain boundaries with multiple
subphases in permanent magnets

Yasutomi Tatetsu

Meio University

69

Na-Mg-F 系超高圧相における秩序無秩序転移

梅本

幸一郎

東京工業大学地球生命研究所

Order-disorder transition in ultrahigh-pressure phase of the
Na-Mg-F system

Koichiro Umemoto

Tokyo Institute ofTechnology

70

DFT 計算による非接触原子間力顕微鏡のエネルギ
ー散逸チャンネルで捉えた原子変位機構の解明

新井

豊子

金沢大学

DFT calculation of atomic displacement captured by energy
dissipation channel of noncontact atomic force microscope

Toyoko Arai

Kanazawa University

71

シリコン結晶マトリックスにナノ粒子アレイを導入することによる 2 経路フォノン干渉共鳴誘導ストップバンド

胡

東京大学機械工学塩見研究室

Two-Path Phonon-Interference Resonance Induces a StopBand in Silicon Crystal Matrix by Embedded Nanoparticles
Array

Shiqian Hu

The University of
Tokyo

72

高分子系有機半導体の電子状態・界面準位の第一原理的研究柳澤

Susumu Yanagisawa

University of the
Ryukyus73

Takashi Nakayama

Chiba University

世

ISSP Activity Report 2020135将

琉球大学理学部物質地球科学科物 First-principles investigation on the electronic properties ofpolymer organic semiconductors
理系

第一原理計算に基づく金属／半導体界面のギャップ
中山
状態制御の物理 III：電場下・合金界面への展開

隆史

千葉大学理学部物理学科

74

反転中心の破れた反強磁性体の第一原理電子状
態計算

山内

邦彦

京都大学学際融合教育研究推進セ First-principles electronic structure calculations of noncentrosymmetric antiferromagnets
ンター

Kunihiko Yamauchi

Kyoto University

75

第一原理計算による高温水中の多価アルコールの反応過程の研究

佐々木

東京大学
研究科

Takehiko Sasaki

The University of
Tokyo

76

ギ酸分解触媒及び酸素吸蔵材料の省貴金属化

國貞雄治

Yuji Kunisada

Hokkaido University

77

固体光吸収の第一原理計算

篠原康

東京大学工学系研究科附属光量子 First-principles calculations for light absorption of crystalline
solids
科学研究センター

Yasushi Shinohara

The University of
Tokyo

78

原子層面内ヘテロ構造・積層構造におけるスピ
ン偏極・擬スピン偏極の生成

明楽浩史

北海道大学大学院工学研究院

Generation of spin and pseudospin polarizations in atomiclayer inplane heterostructures and stacked structures

Hiroshi Akera

Hokkaido University

79

第一原理計算を用いた永久磁石内の様々な相・相界面に対する交換結合定数計算および界面磁気特性の解明

寺澤麻子

高度情報科学技術研究機構

First-principles calculation of exchange coupling constants andinvestigation of interface magnetism for various phases andAsako Terasawa
their interfaces of permanent magnets

80

ナノ構造の量子伝導の第一原理計算

小林伸彦

筑波大学 数理物質系
域First-principles study of quantum transport in nanostructures

Nobuhiko Kobayashi University of Tsukuba

81

フォノン及び電子フォノン相互作用の第一原理
精密解析

南谷

英美

分子科学研究所

Ab-initio analysis of phonon and electron-phonon interaction

Emi Minamitani

82

第一原理計算を用いたクラスレート化合物の熱
電特性解析

大西

正人

東京大学機械工学専攻

Analysis of Thermoelectric Properties of Clathrate Compounds
Masato Ohnishiwith Ab Initio Calculations

The University of
Tokyo

83

Sb 系テラヘルツトランジスタのための歪バンド
構造設計

藤代

博記

東京理科大学

Strained Band-Structure Engineering for Antimonide-BasedTerahertz Transistors

Tokyo University of
Science

岳彦

First-principles study on physics of gap-state control at metal/
semiconductor interfaces III: effects of electric field and alloy
interface

大学院新領域創成科学 Reaction processes of polyalcohols in high temperature waterby First Principles Calculations

北海道大学大学院工学研究院

附属エネル

ギー・マテリアル融合領域研究センター

物理工学

Reduction of Rare Metals in Formic Acid Decomposition
Catalysts and Oxygen Storage Materials

Hiroki Fujishiro

Research Organization
for Information Scienceand Technology

Institute for Molecular
Science136
ISSP Activity Report 2020

No.

課題名

氏名

所属

84

ナノ界面・分子構造の最適特性設計のための第一原理 / 機械学習連成計算

鶴田健二

岡山大学大学院自然科学研究科

Hybrid Ab-Initio/Machine-Learning Optimization of Nano
Interfaces and Molecular Structures

85

第一原理分子動力学法に基づくガラスの静的構
造に関する研究高良明英

熊本大学技術部

Ab initio molecular dynamics study on static structure of glass
Akihide Koura
materials

86

酸化物界面の安定構造探索および偏析現象の解
明

幾原

雄一

東京大学大学院工学系研究科総合 Study of atomic structure and segregation behavior in oxideinterface研究機構

87

第一原理分子動力学法に基づくガラスの静的構
造に関する研究高良明英

熊本大学技術部

Ab initio molecular dynamics study on static structure of glass
Akihide Koura
materials

Kumamoto University

88

熱力学状態図作成のための第一原理計算 : 交換相
中村
関汎関数依存性和磨

九州工業大学

Ab initio calculation for thermodynamic phase diagram:
Investigation on exchange-correlation functional dependence

Kazuma Nakamura

Kyushu Institute ofTechnology

89

van der Waals 密度汎関数法による金 (110) 表面
濱本に吸着した銅フタロシアニンの理論的研究

雄治

大阪大学 大学院工学研究科 物理 van der Waals density functional study of Cu phthalocyanine
adsorbed on the Au(110) surface
学系専攻

Yuji Hamamoto

Osaka University

90

イリジウム酸化物 Ca5Ir3O12 の第一原理フォノ
ン計算

中村

和磨

九州工業大学

Kazuma Nakamura

Kyushu Institute ofTechnology

91

van der Waals 密度汎関数法による金 (110) 表面
濱本に吸着した銅フタロシアニンの理論的研究

雄治

大阪大学 大学院工学研究科 物理 van der Waals density functional study of Cu phtyalocyanine
adsorbed on the Au(110) surface
学系専攻

Yuji Hamamoto

Osaka University

92

第一原理計算による高温水中のソルビトールの環化脱水反応の研究

佐々木

東京大学
研究科

Takehiko Sasaki

The University of
Tokyo

93

超並列計算を⽤いた計算物質科学とデータ駆動
科学の融合

星

鳥取大学大学院工学研究科機械宇 Fusion of computational material science and data-driven
science with massively parallel computation
宙工学専攻応用数理工学講座

Takeo Hoshi

Tottori University

94

群論に基づくバンド計算

斎藤峯雄

金沢大学理工研究域数物科学系

Band structure calculation based on the group theory

Mineo Saito

Kanazawa University

95

照射損傷と格子間原子との相互作用の研究

大澤一人

九州大学応用力学研究所

Study of interaction between radiation damage and interstitial
atom

Kazuhito Ohsawa

Kyushu University

96

ダブルペロブスカイト型光触媒の電子構造に関
する研究

西館

数芽

岩手大学理工学部

Investigation on the electronic structure of photo-catalytic
double-perovskite

Kazume Nishidate

IWATE University

97

燃料電池電極触媒及び水素透過膜の省貴金属化

坂口紀史

Reduction of Rare Metals in Fuel Cell Catalysts and Hydrogen
Permeable Membrane

Norihito Sakaguchi

Hokkaido University

98

第一原理分子動力学法による異種界面原子構造
の解析

幾原

雄一

東京大学大学院工学系研究科総合 Analysis of hetero-interface by ab-initio molecular dynamics
simulations
研究機構

Yuichi Ikuhara

The University of
Tokyo

99

KKR グリーン関数法を用いたハイスループット
材料計算手法の開発

福島鉄也

東京大学物性研究所

Tetsuya Fukushima

The University of
Tokyo

100

機械学習を用いた高性能フッ素ポリマーエレク
トレットの開発鈴木雄二

東京大学大学院工学系研究科機械 Development of High-performance Polymer Electret with the
Aid of Machine Learning
工学専攻

Yuji Suzuki

The University of
Tokyo

岳彦

健夫

Title

Ab initio phonon calculation for Ca5Or3O12

大学院新領域創成科学 Study on cyclodehydration of sorbitol in hot water by First
Principles calculations

北海道大学大学院工学研究院

附属エネル

ギー・マテリアル融合領域研究センター

High-throughput screening calculations by KKR Green's
function method

Name
Kenji Tsuruta

Yuichi Ikuhara

Organization
Okayama University
Kumamoto University
The University of
Tokyo

No.

課題名

氏名
世谦

所属
東京大学機械工学塩見研究室

Title

Name

Study of Phonon Thermal Conduction in Two-dimensional (2D)
Shiqian Hu
Composite Materials

Organization
The University ofTokyo

101 二次元複合材料におけるフォノン熱伝導の研究

胡102 絶縁体非線形光吸収の第一原理計算

篠原康

東京大学工学系研究科附属光量子 First-principles calculations for nonlinear light absorption of
insulators
科学研究センター

Yasushi Shinohara

The University ofTokyo

103 グラフェンへのドーピングと分子吸着藤本義隆

東京工業大学大学院理工学研究科
Doping and molecular adsorption of graphene
物性物理学専攻

Yoshitaka Fujimoto

Tokyo Institute ofTechnology

104

Na フラックス GaN 成長における融液構造および融液物性の解析

河村貴宏

三重大学大学院工学研究科

First-principles analysis of melt structure and property in Na
flux GaN growth

Takahiro Kawamura

Mie University

105

KKR グリーン関数法による磁性不規則合金のデータベース構築福島鉄也

東京大学物性研究所

Construction of magnetic materials database by KKR Green's
function method

Tetsuya Fukushima

The University of
Tokyo

赤井

久純

東京大学物性研究所

Magnetic properties of rare earth magnetic materials withstructural dis- order

Hisazumi Akai

The University of
Tokyo

107

不純物ドープによるε型とκ型の Ga2O3 の光学
首藤的バンドギャップ制御健一

横浜国立大学・工学部

Optical gaps of metastable Ga2O3 structures modulated by
impurity dope

Ken-ichi Shudo

Yokohama Nat'l Univ.

108

第一原理計算による有機強誘電体・圧電体の物
性予測

石橋

章司

産業技術総合研究所

Prediction of properties of organic ferroelectrics andpiezoelectrics by first-principles calculation

Shoji Ishibashi

National Institute ofAdvanced Industrial
Science and Technology

109

合金触媒の原子構造と電子構造に関する第一原
理計算

野澤

和生

鹿児島大学理学部物理科学科

First-principles study of atomic and electronic structures ofintermetallic compound catalysts

Kazuki Nozawa

Kagoshima University

110

純水による Si 単結晶の触媒表面基準エッチングのメカニズム解明

BUI
VANPHO

大阪大学大学院工学研究科

Study on removal mechanism in catalyst referred etching of
single crystalline Si with pure water

Vanpho Bui

Osaka University

111

スピン流 - 電流変換物質における電界効果の第一
山口
原理計算

直也

金沢大学ナノマテリアル研究所

First-principles Calculation of Electric Field Effects in Spin-tocharge Conversion Materials

Naoya Yamaguchi

Kanazawa University服部賢

奈良先端科学技術大学院大学物質
Atomic structure and electronic states for silicide films
創成科学研究科

Ken Hattori

環境調和型シリサイド SrSi2 の熱電性能への不純飯田
物添加効果の理論的研究

努

東京理科大学

A theoretical study on the effect of impurity doping on thethermoelectric performance of environmental friendly silicide
SrSi2

Nara Instituteof Science andTechnology

Tsutomu Iida

Tokyo University of
Science影島博之

島根大学大学院自然科学研究科

Study on structural elementary excitations at semiconductor
surfaces and interfaces

Hiroyuki Kageshima

Shimane University

Study of Efficient Training Data Generation Method forConstructing Artificial Neural Network Force Field

Kohei Shimamura

Kumamoto University

Yosuke Harashima

Nagoya University

Wataru Mizukami

Osaka University

106 乱れた構造を伴う希土類磁石材料の磁気特性

ISSP Activity Report 2020

112 シリサイド薄膜系の原子構造と電子状態
113

114 半導体表面界面における構造的素励起の研究

137

115

人工ニューラルネットワーク力場構築のための効率的な学習データ生成法の模索

島村孝平

熊本大学大学院先端科学研究部

116

パワー半導体デバイスのリーク電流と貫通転位
における電子状態

原嶋

庸介

名古屋大学未来材料・システム研 Leakage current on power semiconductor devices and anelectronic structure on a threading dislocation
究所

117

量子古典混合アルゴリズムを用いた結晶系の第
一原理計算

水上

渉

大阪大学 先導的学際研究機構

First principles calculations of crystals with quantum classicalhybrid algorithms

138
ISSP Activity Report 2020

No.

課題名

118

Sb 系テラヘルツトランジスタのための歪バンド
構造設計

藤代

博記

東京理科大学

Strained Band-Structure Engineering for Antimonide-BasedTerahertz Transistors

Hiroki Fujishiro

Tokyo University of
Science119

不純物ドープによる Ga2O3 および GaN の光学的バンドギャップ制御

首藤健一

横浜国立大学・工学部

Optical gaps of metastable Ga2O3 and GaN with impurity
doping effectKen-ichi Shudo

Yokohama Nat'l Univ.

120

量子古典混合アルゴリズムを用いた第一原理計
算のノイズを考慮したシミュレーション

水上渉大阪大学 先導的学際研究機構

Noisy simulations of first-principles calculations using quantum
Wataru Mizukami
classical hybrid algorithms

Osaka University

赤井久純

東京大学物性研究所

Magnetic properties of rare earth magnetic materials withstructural disorder

Hisazumi Akai

The University ofTokyo

121 乱れた構造を伴う希土類磁石材料の磁気特性

氏名

所属

Title

Name

Organization

122

ポストポストペロブスカイト転移における Al 不梅本
純物の影響についての第一原理研究

幸一郎

東京工業大学地球生命研究所

First principles study of effect of Al impurity on the post-postperovskite transitions

Koichiro Umemoto

Tokyo Institute ofTechnology

123

新たなナノスケール表面界面の電子物性の理論
的研究

小林

功佳

お茶の水女子大学理学部物理学科

Theoretical study on electronic properties of new nanoscalesurfaces and interfaces

Katsuyoshi
Kobayashi

Ochanomizu
University124

微小グラフェンシートの STM 観測で得られる特有馬
異な輝点列の起源の解明

健太

大阪大学 大学院 工学研究科

Origin of specific dot patters on small graphene sheets
observed by STM

Kenta Arima

Osaka University

125

対称性指標を用いた網羅的なトポロジカル物質
探索

渡邉

悠樹

東京大学工学系研究科物理工学専
Comprehensive material search based on symmetry indicators Haruki Watanabe
攻126

固体表面・界面、微粒子の新規電子物性の探索
と実現

稲岡

毅

琉球大学理学部

Search and realization of novel electronic properties of solid
surfaces and interfaces and of small particles

Takeshi Inaoka

University of the
Ryukyus127

磁性分子複合体・結晶・界面系の原子・磁気構造の解析と外部電場・磁場効果の調査

小幡正雄

金沢大学理工研究域

Analysis on atomic and magnetic structure in magnetic
molecular complex, crystal and interface and investigation of
external electric and magnetic field effectMasao Obata

Kanazawa University

128

希土類セスキオキシドにおける電子格子相互作
用の計算

牧野

哲征

福井大学学術研究院工学系部門

Electron-phonon interaction calculation in rare-earth
sesquioxides

Takayuki Makino

University of Fukui

129

密度汎関数理論と線形応答理論の枠組みにおけるゼーベック係数計算手法の開発

高東京工業大学物質理工学院

Development of Seebeck coefficient calculation method in theframework of density functional theory and linear response
theorySonju Kou

Tokyo Institute ofTechnology

130 強相関電子系における多極子秩序と超伝導
131

半導体デバイス中のキャリアダイナミクスの機械学習モデルに関する研究

132 原子層物質形成反応の解析と物性予測

成柱

The University of
Tokyo

池田

浩章

立命館大学理工学部物理科学科

Multipole orders and superconductivity in strongly correlated
electron systems

Hiroaki Ikeda

Ritsumeikan
University

村口正和

北海道科学大学

Study on machine learning model of carrier dynamics insemiconductor devices

Masakazu Muraguchi

Hokkaido Universityof Science

島田

敏宏

北海道大学

Analysis of reaction and prediction of properties of atomic
layer materials

Toshihiro Shimada

Hokkaido University

大学院工学研究院

133

酸化チタン界面における光触媒反応メカニズムの理論的解析

城塚

達也

茨城大学

Theoretical Analysis of Photocatalytic Reaction Mechanism at
Tatsuya Joutsuka
Titanium Dioxide Interfaces

134

PMT 基底関数法を用いた第一原理多体有効模型
構築

榊原

寛史

鳥取大学大学院工学研究科

First-principles derivation of a many-body effective model
based on PMT basis

Ibaraki University

Hirofumi Sakakibara Tottori University

No.

課題名

135

機械学習と第一原理計算による赤外およびラマンスペクトルの予測方法の検証

平塚将起

工学院大学機械工学科

Estimation of Infrared and Raman spectra using ab initio
calculation and machine learning

Masaki Hiratsuka

Kogakuin University

136

LCPAO 法を用いた一様電場下にある絶縁体・半導体バルクにおけるバンド分散の第一原理的解析

山口直也

金沢大学ナノマテリアル研究所

First-principles Analysis of Band Dispersion in Bulk Insulators/
Semiconductors Under Finite Electric Fields by Using the
Naoya Yamaguchi
LCPAO Method

Kanazawa University

137

プロトン伝導性有機結晶中の水素結合構造の解析

堀

筑波大学計算科学研究センター

The analysis of the hydrogen-bonding structures in protonconduction organic crystals

Yuta Hori

University of Tsukuba

138

第一原理計算と機械学習を用いた固体中の塑性
波伝播の分子動力学シミュレーション

三澤賢明

岡山大学大学院自然科学研究科

Molecular Dynamics Simulation on Plastic-Wave Propagation
in Solid Materials Based on First-Principles Calculation andMachine Learning

Masaaki Misawa

Okayama University

139

対称性指標を用いた網羅的なトポロジカル物質
探索

渡邉

悠樹

東京大学工学系研究科物理工学専
Comprehensive material search based on symmetry indicators Haruki Watanabe
攻140

2 次元物質の周期表に基づく動的に安定な合金の小野
新しい探索法

頌太

岐阜大学

141

有機・無機材料界面における自己秩序化現象の
機構解明

折本

裕一

九州大学大学院総合理工学研究院 Elucidation of the mechanism of self-ordering phenomena at
the interface between organic and inorganic materials
物質科学部門櫻井

誠大

東京大学物性研究所

First-principles KKR calculations for evaluating magnetic
properties

東北大学材料科学高等研究所

First-principles calculation for low-temperature oxygen transfer
Akira Yoko
in metal oxide

Tohoku University

Carbonization reaction and electronic structures of molecular
crystals under high temperature high pressure conditions

Toshihiro Shimada

Hokkaido University

142 第一原理 KKR 計算を用いた磁気特性の評価

氏名

優太

所属

Title

Name

A new method for exploring dynamically stable alloys from the
Shota Ono
periodic table of 2D materials

Organization

The University ofTokyo
Gifu University

Yuuichi Orimoto

Kyushu University

Masahiro Sakurai

The University of
Tokyo

ISSP Activity Report 2020

143

低温で酸素移動が生じる金属酸化物の第一原理
計算

横

144

高温高圧における分子結晶の炭化反応と電子状
態

島田

敏宏

北海道大学

145

新しい基底関数法 PMT を用いた第一原理多体有
榊原
効模型構築

寛史

鳥取大学大学院工学研究科

First-principles derivation of a many-body effective model
based on a new basis PMT

Hirofumi Sakakibara Tottori University

高橋修

広島大学大学院理学研究科

Electronic state of organic compounds in aqueous solution

Osamu Takahashi

Hiroshima University

146 有機物水溶液の電子状態

哲

大学院工学研究院

147

第一原理計算と機械学習を用いた非平衡過程に関する分子動力学的研究

三澤賢明

岡山大学大学院自然科学研究科

Molecular dynamics study on non-equilibrium processes using
Masaaki Misawa
first-principles calculation and machine leaning

Okayama University

148

触媒インフォマティクスに向けた複合酸化物の表面物性計算日沼洋陽

東京工業大学科学技術創成研究院

Calculation of multication oxide surface properties for catalyst
Yoyo Hinuma
informatics

Tokyo Institute ofTechnology

小口

多美夫

大阪大学産業科学研究所

Magnetocaloric Effect of Transition-Metal Alloys

Tamio Oguchi

Osaka University

真砂

啓

大阪大学基礎工学部

First principles calculations of thermal dependence ofconductivity and Seebeck coefficient

Akira Masago

Osaka University

福田

将大

東京大学物性研究所

Analysis of local quantities of electron field in material surface Masahiro Fukuda

149 遷移金属合金の磁気熱量効果150

電気伝導度の温度依存性とゼーベック係数の第
一原理計算

139

151 物質表面における電子場の局所量解析

The University of
Tokyo

140

No.

課題名

152

低圧化学気相成長法による金属膜の高速成長の第一原理計算ISSP Activity Report 2020

153 液晶における電子輸送機構のモデル化と解明

氏名

所属

Title

Name

Organization

城塚

達也

茨城大学

Ab Initio Calculation of High-Rate Deposition of Metal Film by
Tatsuya Joutsuka
Low-Pressure Chemical Vapor Deposition

Ibaraki University

大野玲

東京工業大学

Modeling and elucidation of electron transport mechanism inliquid crystals

Akira Ohno

Tokyo Institute ofTechnology

東北大学材料科学高等研究所

First-principles calculation of oxygen storage capacity andstructural distortion of metal doped cerium oxide

Akira Yoko

Tohoku University

Yoyo Hinuma

Tokyo Institute ofTechnology

154

金属ドープによるセリウム酸化物の格子歪発現と酸素貯蔵能向上に関する第一原理計算

横155

触媒インフォマティクスに向けた合成可能な表
面探索

日沼

洋陽

東京工業大学科学技術創成研究院 Search of accessible surfaces for catalyst informatics

156

合⾦触媒の原⼦構造と電⼦構造に関する第⼀原
理計算

野澤

和生

鹿児島大学理学部物理科学科

First-principles study of atomic and electronic structures ofintermetallic compound catalysts

Kazuki Nozawa

Kagoshima University157

磁性分子複合体・結晶・界面系の原子・磁気と原子構造の解析と外部電磁場効果の調査

小幡正雄

金沢大学理工研究域

Analysis on atomic and magnetic structure in magnetic
molecular complex, crystal and interface and investigation of
external electromagnetic field effectMasao Obata

Kanazawa University158

波数空間分解光電子分光を用いた 分子結晶表面の解析手法の確立

二木

かおり

千葉大学

Establishment of molecular crystal surface analysis technique
Kaori Niki
using wave number space resolved photoelectron spectroscopy

Chiba University

159

純⽔による Si 単結晶の触媒表⾯基準エッチング BUIのメカニズム解明
VANPHO

大阪大学大学院工学研究科

Study on removal mechanism of single crystalline Si planarized
Vanpho Bui
by catalyst referred etching in pure water

Osaka University

160

ダブルペロブスカイト型光触媒の電子構造に関
する研究

西館

岩手大学理工学部

Investigation on the electronic structure of photo-catalytic
double-perovskite

IWATE University

161

ドライエッチング工程におけるフロロカーボン
誘電膜の第一原理計算

レービガー
ハンネス

横浜国立大学 大学院工学研究院 First principles calculation of fluorocarbon layer in dry etching
Hannes Raebiger
process
物理工学コース162

デラフォサイト型銅酸化物における定常電場印
加下での電子構造計算

牧野哲征

福井大学学術研究院工学系部門

Electronic structure calculation under presence of static
electric field in delafossite-type cuprates

Takayuki Makino

University of Fukui

163

固体表⾯・界⾯、微粒⼦の新規電⼦物性の探索
と実現

稲岡

毅

琉球大学理学部

Search and realization of novel electronic properties of solid
surfaces and interfaces and of small particles

Takeshi Inaoka

University of the
Ryukyus164

酸化物における電場印加下でのフォノン分散および状態密度の計算

牧野哲征

福井大学学術研究院工学系部門

Calculation of phonon dispersion and density of states underelectric field in oxides

Takayuki Makino

University of Fukui

165

強相関系酸化物反強磁性体における電子構造の
計算

牧野

哲征

福井大学学術研究院工学系部門

Calculation of electronic states in strongly-electron-correlated
antiferromagnetic oxides

Takayuki Makino

University of Fukui

池田浩章

立命館大学理工学部物理科学科

Multipole orders and superconductivity in strongly correlated
electron systems

Hiroaki Ikeda

Ritsumeikan
University

Matsunaka Daisuke

Shinshu University

Katsuyoshi
Kobayashi

Ochanomizu
University

166 強相関電子系における多極子秩序と超伝導

哲

数芽

167

第一原理計算に基づくマグネシウム合金の欠陥
場の解析

松中

大介

信州大学工学部機械システム工学
First-principles Study of Defects of Magnesium Alloys
科

168

新たなナノスケール表面界面の電子物性の理論
的研究

小林

功佳

お茶の水女子大学理学部物理学科

Theoretical study on electronic properties of new nanoscalesurfaces and interfaces

Kazume Nishidate

Yokohama National
University

No.

課題名

氏名

所属

169

第一原理計算に基づくマグネシウム合金の欠陥
場の解析

松中

大介

信州大学工学部機械システム工学
First-principles Study of Defects of Magnesium Alloys
科

170

ナノ界面・分子構造の最適特性設計のための第一原理 / 機械学習連成計算

鶴田健二

岡山大学大学院自然科学研究科

171

異なる幅を持つグラフェンナノリボンのフェル
ミレベル近傍電子状態の解析

有馬健太

172 照射損傷と格子間原子との相互作用の研究

大澤

173 半導体表面界面における構造的素励起の研究

Title

Name

Organization

Matsunaka Daisuke

Shinshu University

Hybrid Ab-Initio/Machine-Learning Optimization of Nano
Interfaces and Molecular Structures

Kenji Tsuruta

Okayama University

大阪大学 大学院 工学研究科

Analysis of electronic structures around the Fermi level ofgraphene nanoribbons with different widths

Kenta Arima

Osaka University

一人

九州大学応用力学研究所

Study of interaction between radiation damage and interstitial
atom

Kazuhito Ohsawa

Kyushu University

影島博之

島根大学大学院自然科学研究科

Study on structural elementary excitations at semiconductor
surfaces and interfaces

Hiroyuki Kageshima

Shimane University

ISSP Activity Report 2020

141

174

低圧化学気相成⻑法による⾦属膜の⾼速成⻑の第⼀原理計算

城塚

達也

茨城大学

Ab Initio Calculation of High-Rate Deposition of Metal Films
by Low-Pressure Chemical Vapor Deposition

Tatsuya Joutsuka

Ibaraki University

175

酸化チタン界⾯における光触媒反応メカニズムの理論的解析

城塚

達也

茨城大学

Theoretical Analysis of Photocatalytic Reaction Mechanism atTitanium Dioxide Interfaces

Tatsuya Joutsuka

Ibaraki University

176

金属表面上の吸着フタロシアニン分子間相互作
用

有賀

哲也

京都大学理学研究科化学専攻

Interaction among phthalocyanine molecules adsorbed on
metal surfaces

Aruga Tetsuya

Kyoto University

177

窒化ガリウム p-n ダイオードの不純物と貫通転位複合体の電子状態計算

原嶋庸介

名古屋大学未来材料・システム研 First-principles study on complexes of impurity and dislocation
Yosuke Harashima
in GaN p-n diodes
究所

178

第一原理計算による有機強誘電体・圧電体の物
性予測

石橋

章司

産業技術総合研究所

Prediction of properties of organic ferroelectrics andpiezoelectrics by first-principles calculation

Shoji Ishibashi

National Institute ofAdvanced Industrial
Science and Technology

179

ビスマステルル / 強磁性金属界面の電子状態とス
千葉
ピン構造の解明貴裕

福島工業高等専門学校

Band structure and spin texture of Bi-Te/ferromagnetic-metalinterface

Takahiro Chiba

Fukushima College

180

反強磁性 Cr の電子状態に対する N 添加効果の解
小田
析

洋平

福島工業高等専門学校

Analysis of N-doping effect on electronic structure in
antiferromagnetic Cr

Yohei Kota

Fukushima College

181

π電子系有機分子／金属界面の電子状態と分子
間相互作用

有賀

哲也

京都大学理学研究科化学専攻

Electronic structure and interaction at the interface of
π -electron organic molecules and metals

Aruga Tetsuya

Kyoto University

182

グラフェンにおける金属インターカレーション
構造のバンド計算秋山

了太

東京大学理学系研究科物理学専攻 Band calculation in metal-intercalated graphene

Ryota Akiyama

The University of
Tokyo

183

Pb 系トポロジカル絶縁体のバルク絶縁性向上のためのドーパント探索

徳本有紀

東京大学生産技術研究所

Exploring dopants to improve bulk-insulation of Pb-based
topological insulators

Yuki Tokumoto

The University ofTokyo

184 Quantum ESPRESSO の性能測定

吉澤

香奈子

高度情報科学技術研究機構

Performance measurement of Quantum ESPRESSO

Kanako Yoshizawa

Research Organization
for Information
Science & Technology

185 第一原理計算による光熱変換原理の解明

江目

宏樹

山形大学

Study of the principle of photothermal conversion by ab initio
calculations

Hiroki Gonome

Yamagata University

Nagoya University

142

No.

課題名

氏名

所属

Title

Name

Organization

ISSP Activity Report 2020

186 α -Al2O3 における荷電欠陥の第一原理計算

石川亮

東京大学総合研究機構

First-principles calculation on charged defects in α -Al2O3

Ryo Ishikawa

The University ofTokyo

187 表面および界面構造探索手法の開発

山下智樹

長岡技術科学大学

Development of surface and interface structure prediction
methods

Tomoki Yamashita

Nagaoka University ofTechnology

188 シリサイド薄膜系の原子構造と電子状態

服部賢

奈良先端科学技術大学院大学物質
Atomic structure and electronic states for silicide films
創成科学研究科

Ken Hattori

Nara Instituteof Science andTechnology

189 分子接合の第一原理伝導計算

大戸達彦

大阪大学大学院基礎工学研究科

First-principles transport calculations for molecular junctions

Tatsuhiko Ohto

Osaka University

2. 強相関 / Strongly Correlated Quantum Systems
190

高精度第一原理強相関電子状態計算手法による
高温超伝導体の網羅的研究

今田正俊

早稲田大学理工学術院

Exhaustive Studies on High Temperature Superconductors
by Highly Accurate ab initio Scheme for Strongly CorrelatedElectron Systems

Masatoshi Imada

Waseda University

191

準粒子干渉実験データの機械学習による銅酸化物高温超伝導の解析

今田正俊

早稲田大学理工学術院

Machine learning analyses on quasi-particle interference dataof cuprate high-temperature superconductors

Masatoshi Imada

Waseda University

192

量子スピン液体物質の高精度第一原理有効ハミルトニアンによる数値解析山地洋平

東京大学大学院工学系研究科物理 Numerical studies of quantum spin liquid candidates by highly
Youhei Yamaji
accurate ab initio effective hamiltonians
工学専攻

193

Pd(dmit)2 系分子性導体に対する第一原理低エネ
三澤
ルギー有効 Hamiltonian の系統的解析

貴宏

東京大学物性研究所

194

量子相互情報量による量子スピン液体の数値的
研究

山地

洋平

東京大学大学院工学系研究科物理 Numerical studies of quantum spin liquids by quantum mutual
Youhei Yamaji
information
工学専攻

The University of
Tokyo

195

強相関系の磁性・トポロジカル相形成と輸送現
象

川上

則雄

京都大学大学院理学研究科物理学 Magnetism, topological phase formation and transportphenomena in strongly correlated systems
宇宙物理学専攻

Norio Kawakami

Kyoto University

196 スピン軌道結合の強い相関電子系の理論的研究
197

ニッケル酸化物超伝導体と銅酸化物超伝導体の
比較

求
野村

幸年
悠祐
幸年

Systematic analysis of ab initio low-energy effective
Hamiltonians for Pd(dmit)2 molecular conductors

Takahiro Misawa

The University ofTokyo
The University ofTokyo

東京大学大学院工学系研究科

Theoretical study of correlated electron systems with strong
spin-orbit coupling

Yukitoshi Motome

The University ofTokyo

理化学研究所
センター

Comparison between nickelate and cuprate superconductors

Yusuke Nomura

RIKEN

Theoretical study of correlated electron systems with strong
spin-orbit coupling

Yukitoshi Motome

The University ofTokyo
Kyoto University

創発物性科学研究

198 スピン軌道結合の強い相関電子系の理論的研究

求

東京大学大学院工学系研究科

199 強相関系の相形成と輸送現象

川上則雄

京都大学大学院理学研究科物理学 Study of phase formation and transport phenomena in strongly
Norio Kawakami
correlated quantum systems
宇宙物理学専攻200

軌道間相互作用が増強するスピン揺らぎ媒介超伝導に関する研究

黒木

和彦

大阪大学

201

ニッケル酸化物超伝導体に対する強相関第一原
理計算

野村

悠祐

理化学研究所
センター

Study on spin-fluctuation-mediated superconductivity
enhanced by interorbital interactions

Kazuhiko Kuroki

Osaka University

創発物性科学研究 Ab initio calculation for strongly-correlated nickelate
superconductor

Yusuke Nomura

RIKEN

No.

課題名

202

銅酸化物における特異な電子状態による超伝導増強機構に関する研究

黒木

和彦

大阪大学

Study on the enhanced superconductivity in cuprates withpeculiar electronic structures

Kazuhiko Kuroki

Osaka University203

ボンド依存した異方的相互作用をもつ系における多重 Q 磁気秩序相の探索

速水賢

東京大学大学院工学系研究科

Search for multiple-Q magnetic orders in systems with bonddependent anisotropic interactions

Satoru Hayami

The University of
Tokyo

204

非エルミートトポロジカル系におけるバルクエ
ッジ対応

吉田

恒也

筑波大学

数理物質系

Bulk-edge correspondence for non-Hermitian topologicalsystems

Tsuneya Yoshida

University of Tsukuba

205

非エルミートトポロジカル系における強相関効
果

吉田

恒也

筑波大学

数理物質系

Correlation effects on non-Hermitian topological states

Tsuneya Yoshida

University of Tsukuba

206

希土類永久磁石のための Ce 磁性化合物の最適化
松本
設計

宗久

高エネルギー加速器研究機構 物質構造科学研究所

Optimal design of Ce-based magnetic compounds for rareearth permanet magnets

Munehisa
Matsumoto

Institute of Materials
Structure Science, HighEnergy Accelerator Research
Organization (KEK)207

時間依存密度行列繰り込み群法によるモット絶縁体の光学伝導度のスペクトル形状解析遠山貴己

東京理科大学理学部応用物理学科

Time-dependent DMRG study of spectral shape in the opticalconductivity of Mott insulators

Takami Tohyama

Tokyo University of
Science

208 強相関電子系で発現する量子スピン液体の解析

井戸康太

東京大学物性研究所

Numerical analyses on quantum spin liquids in strongly
correlated electron systems

Kota Ido

The University ofTokyo

2 チャンネル近藤状態とフェルミ液体状態の間に堀田現れる量子臨界点の研究

貴嗣

東京都立大学理学研究科物理学専 Research of Quantum Critical Points Emerging between TwoChannel Kondo and Fermi-Liquid States
攻

Takashi Hotta

Tokyo Metropolitan
University

那須譲治

横浜国立大学

Disorder effect on Kitaev quantum spin liquids

Joji Nasu

Yokohama National
University

Satoru Hayami

The University of
Tokyo

209

210 キタエフ量子スピン液体に対する乱れの効果

氏名

所属

Title

Name

Organization

ISSP Activity Report 2020

211

遍歴電子系における正方格子型スキルミオン結
晶探索

速水

賢

東京大学大学院工学系研究科

Search for square-lattice skyrmion crystal in itinerant electron
systems212

２次元格子モデルにおける電荷グラス相の探索
の理論

堀田

知佐

東京大学総合文化研究科

Exploring charge glass phase in two-dimensional lattice models Chisa Hotta

The University of
Tokyo

213

時間依存密度行列繰り込み群法による二次元ハバード模型の光学伝導度のスペクトル形状解析遠山貴己

東京理科大学理学部応用物理学科

Time-dependent DMRG study of spectral shape in the opticalconductivity of two-dimensional Hubbard model

Takami Tohyama

Tokyo University of
Science214

有機ディラック電⼦系α -(BETS)2I3 における隠れた秩序状態

小林

晃人

名古屋大学

Hidden Ordered State in Organic Dirac Electron System α-(BETS)2I3

Akito Kobayashi

Nagoya University

215

統合型動的平均場近似ソフトウェア DCore の開
品岡
発と応用

寛

埼玉大学理学部物理学科

Development and application of DFT+DMFT software DCore

Hiroshi Shinaoka

Saitama University

大学院理学研究科

143

216 光誘起非平衡ダイナミクスにおける不均一効果

石原純夫

東北大学大学院理学研究科

Inhomogeneous effect in light induced nonequilibrium state

Sumio Ishihara

Tohoku University

217

有機ディラック電子系α -(BETS)2I3 の低温相における隠れた秩序状態

小林

晃人

名古屋大学

Hidden Order in Low Temperature Phase of Organic Dirac
Electron System α -(BETS)2I3

Akito Kobayashi

Nagoya University

218

量子化学計算を用いた固体の電子状態計算の開
発

西口

和孝

大阪大学大学院理学研究科物理学 Development of electronic structure calculation for solids with
Kazutaka Nishiguchi Osaka University
quantum chemistry calculations
専攻

大学院理学研究科

144

No.

課題名

219

２次元格子モデルにおける電荷グラス相の探索の理論その 2

ISSP Activity Report 2020

220 強相関電子系における新規量子現象の研究

氏名

所属

Title

Name

Organization

堀田知佐

東京大学総合文化研究科

Exploring charge glass phase in two-dimensional lattice models Chisa Hotta

The University of
Tokyo

柳沢

孝

産業技術総合研究所

Study of new quantum phenomena in correlated electron
systems

Takashi Yanagisawa

National Institute ofAdvanced Industrial
Science andTechnology

柳沢孝

産業技術総合研究所

Numerical study of strongly correlated electron systems

Takashi Yanagisawa

National Institute ofAdvanced Industrial
Science andTechnology

Masatoshi Sakai

Chiba University

221

モンテカルロ法および第一原理計算による強相
関電子系の数値的研究

222

有機電荷秩序相における電界誘起金属 - 絶縁体転
酒井
移の解明

正俊

千葉大学大学院工学研究院電気電 Field-induced metal-insulator transition in organic chargeorder phase子

223

ポスト - ハートレー - フォック法を⽤いた固体の西口
電⼦状態計算の開発

和孝

大阪大学大学院理学研究科物理学 Development of electronic structure calculation for solids with
Kazutaka Nishiguchi Osaka University
post-Hartree-Fock専攻

224

ファンデルワールス希土類化合物における置換
可能元素のスクリーニング

小林

理気

琉球大学

Screening of substitutable element in van der Waals couplingrare-earth compounds

Riki Kobayashi

University of the
Ryukyus225

相関電子系における非平衡ダイナミクスの数値
的研究

石原

純夫

東北大学大学院理学研究科

Numerical study of nonequilibrium dynamics in correlated
electron systems

Sumio Ishihara

Tohoku University

226

変分モンテカルロ法による銅酸化物高温超伝導体のストライプ秩序と超伝導の解析

渡部

洋

立命館大学

Study for stripe order and superconductivity in high-Tc
cuprates by variational Monte Carlo method

Hiroshi Watanabe

Ritsumeikan
University

227

希土類金属化合物における置換可能非磁性元素のスクリーニング II

小林

理気

琉球大学

Screening of substitutable non-magnetic element in rare-earth
inter-metallic compounds II

Riki Kobayashi

University of the
Ryukyus228

ハバードモデルによる、強相関電子系での超伝導状態 、および磁性状態の研究。

山田篤志

千葉大学理学研究科

Studies of the superconductivity and magnetic states in thestrongly correlated electron systems using Hubbard models.

Atsushi Yamada

Chiba University229

有機電荷秩序相における電子状態の余剰キャリ
ア依存性

酒井

正俊

千葉大学大学院工学研究院電気電 Excess carrier dependent electronic state in organic chargeorder phase子

Masatoshi Sakai

Chiba University

3. 巨視系の協同現象 / Cooperative Phenomena in Complex, Macroscopic Systems
230

複雑流体中におけるキャビテーションの分子動力学シミュレーション

浅野優太

東京大学物性研究所

Molecular dynamics simulation of cavitation in complex fluids

Yuta Asano

The University of
Tokyo

231

テンソルネットワーク法によるキタエフ関連モ
デルの計算

川島

直輝

東京大学物性研究所

Tensor-network study of Kitaev models

Naoki Kawashima

The University of
Tokyo

232

全原子・粗視化力場によるソフトマターの分子シミュレーション篠田

渉

名古屋大学大学院工学研究科

Molecular Simulation of Soft Materials using All-Atom andCoarse- Grained Force Field

Wataru Shinoda

Nagoya University

233

テンソルネットワーク法によるキタエフ関連モ
デルの計算

川島

直輝

東京大学物性研究所

Tensor-network study of Kitaev models

Naoki Kawashima

The University of
Tokyo

234

複雑流体中のキャビテーションの分子動力学シ
ミュレーション

浅野優太

東京大学物性研究所

Molecular dynamics simulation of cavitation in complex fluids

Yuta Asano

The University of
Tokyo

No.

課題名

氏名

235

全原子・粗視化力場によるソフトマターの分子シミュレーション篠田

渉

名古屋大学大学院工学研究科

Molecular Simulation of Soft Materials using All-Atom andCoarse-Grained Force Field

Wataru Shinoda

Nagoya University236

無秩序キタエフ模型の大規模並列計算による
O(N) 解法

藤本

聡

大阪大学基礎工学研究科

O(N) solution to the disordered Kitaev model using the largescale parallel computing

Satoshi Fujimoto

Osaka University237

環状鎖と線状鎖の混合系における二軸伸張流下のストレスオーバーシュート現象の確認

萩田克美

防衛大学校応用科学群応用物理学 Confirmation of stress-overshoot phenomena under biaxial
elongational flow of ring-linear mixtures
科

Katsumi Hagita

National Defense
Academy238

分子動力学シミュレーションによるタンパク質
集合体の離合集散の研究

奥村久士

自然科学研究機構生命創成探究セ Molecular dynamics simulations for assembly and disassembly
Hisashi Okumura
of protein aggregates
ンター

Institute for Molecular
Science239

不純物の乱れから生じる隠れた SU(2) 対称反強磁性スピンの巨大磁気応答

諏訪秀麿

東京大学大学院理学系研究科物理 Giant magnetic response of hidden SU(2) symmetricantiferromagnets induced by impurity disorder
学専攻

Hidemaro Suwa

The University ofTokyo

東京大学大学院理学系研究科
理学専攻

Finite temperature properties of frustrated spin systems

Tsuyoshi Okubo

The University of
Tokyo

毅

所属

Title

物

Name

Organization

240 有限温度フラストレート磁性体の物性解明

大久保

241 生体膜の構造形成野口博司

東京大学物性研究所

Structure formation of biomembrane

Hiroshi Noguchi

The University of
Tokyo

ISSP Activity Report 2020242

マテリアルズ・インフォマティクスを用いた熱機能材料探索塩見淳一郎

東京大学工学系研究科

Development of Thermal Functional Materials Using Materials
Junichiro Shiomi
Informatics

The University of
Tokyo

243

蛋白質物性に強く関与するソフトモードの効率的サンプリングシミュレー ション

北尾彰朗

東京工業大学生命理工学院

Efficient sampling simulation of the soft modes significantly
contribute to protein properties

The University ofTokyo

マルチスケール流動シミュレーション⽤プラッ
244 トフォームを⽤いた流体―弾性体連成シミュレ
ーション

川勝

年洋

東北大学大学院理学研究科物理学 Fluid-elastomer hybrid simulations using multiscale simulation
Toshihiro Kawakatsu Tohoku University
platform
専攻

数値的手法によるトポロジカル相とバルクエッジ対応の研究：古典力学系から量子系まで

初貝安弘

筑波大学大学院数理物質科学研究 Numerical study of bulk-edge correspondence and topological
Yasuhiro Hatsugai
phases: From quantum to classical mechanics
科物理学専攻246 新奇なランダムトポロジカル系の量子相転移

大槻東巳

上智大学理工学部

Quantum phase transitions in novel disordered topologicalsystems

Tomi Ohtsuki

Sophia University

247 新奇なランダム系の量子相転移

大槻東巳

上智大学理工学部

Quantum phase transitions in novel disordered systems

Tomi Ohtsuki

Sophia University

248 ⽣体膜の構造形成野口博司

東京大学物性研究所

Structure formation of biomembrane

Hiroshi Noguchi

The University of
Tokyo

245

Akio Kitao

University of Tsukuba

145

249

量子多体系におけるトポロジカルな秩序と量子ダイナミクス

藤堂眞治

東京大学大学院理学系研究科物理 Topological Order and Quantum Dynamics in Quantum ManySynge Todo
body Systems
学専攻

250

マテリアルズ・インフォマティクスを用いた熱機能材料探索塩見淳一郎

東京大学工学系研究科

Development of Thermal Functional Materials Using Materials
Junichiro Shiomi
Informatics

The University ofTokyo

251 拡張 Kitaev 模型におけるスピン動的構造因子

井戸

康太

東京大学物性研究所

Spin dynamical structure factor in extended Kitaev model

The University ofTokyo

Kota Ido

The University of
Tokyo

146

No.

課題名

氏名

ISSP Activity Report 2020

252 有限温度フラストレート磁性体の物性解明

大久保毅

253 フラストレート磁性体における新奇秩序

川村

光

所属
東京大学大学院理学系研究科
理学専攻

Title

物

Name

Organization

Finite temperature properties of frustrated spin systems

Tsuyoshi Okubo

The University ofTokyo

公益財団法人豊田理化学研究所

Novel order in frustrated magnets

Hikaru Kawamura

Toyota Physical andChemical ResearchInstitute254

拡張動的平均場理論による第一原理データと実験測定結果の自己無撞着解析松本

宗久

高エネルギー加速器研究機構 物質構造科学研究所

Self-consistent analysis between ab initio data andexperimental measurement results via extended dynamicalmean field theory

Munehisa
Matsumoto

Institute of Materials
Structure Science, HighEnergy Accelerator Research
Organization (KEK)255

蛋⽩質物性に強く関与するソフトモードの効率的サンプリングシミュレー ション

北尾彰朗

東京工業大学生命理工学院

Efficient sampling simulation of the soft modes significantly
contribute to protein properties

Akio Kitao

The University of
Tokyo

岡本

祐幸

名古屋大学大学院理学研究科

Study on complex systems by generalized-ensemble algorithms Yuko Okamoto

加藤雄介

東京大学総合文化研究科広域科学 Dynamics of Kitaev spin liquid via functional renormalizationgroup method
専攻相関基礎科学系

樋口祐次

東京大学物性研究所

諏訪秀麿

東京大学大学院理学系研究科物理 Impurity effect on giant magnetic response of a twodimensional antiferromagnet
学専攻

Hidemaro Suwa

The University of
Tokyo

福島

孝治

東京大学大学院総合文化研究科

Parallel Bayesian computation in material science

Koji Hukushima

The University ofTokyo

準結晶電子系における非平衡ダイナミクスの数
値解析

古賀

昌久

東京工業大学

Numerical analysis for nonequilibrium dynamics in electronicsystems on quasicrystals

Akihisa Koga

Tokyo Institute ofTechnology

262 蜂の巣格子拡張キタエフ模型の基底状態相図２

鈴木隆史

兵庫県立大学

Takafumi Suzuki

University of Hyogo

263 実験理論データ統合による最適化磁性材料設計

松本

宗久

高エネルギー加速器研究機構 物質構造科学研究所

Optimal design of magnetic materials via data integration
between experiments and theory

Munehisa
Matsumoto

Institute of Materials
Structure Science, HighEnergy Accelerator Research
Organization (KEK)264

粗視化シミュレーションによる両親媒性分子の凝集プロセス

樋口祐次

東京大学物性研究所

Self-assemble process of amphiphilic molecules by coarsegrained molecular dynamics simulation

Yuji Higuchi

The University of
Tokyo

265

汎関数くりこみ群によるキタエフハイゼンベル
グの動力学の研究

加藤雄介

東京大学総合文化研究科広域科学 Functional renormalization group approach for dynamics ofKitaev-Heisenberg model
専攻相関基礎科学系

Yusuke KatoThe University of
Tokyo

266

新型コロナウイルス感染症の治療薬開発に向けたタンパク質デザイン新井宗仁

東京大学大学院総合文化研究科

Protein design toward the development of therapeutic drugs
for COVID-19

Munehito Arai

The University of
Tokyo

川村

光

公益財団法人豊田理化学研究所

Novel order in frustrated magnets

Hikaru Kawamura

Toyota Physical andChemical ResearchInstitute藤堂眞治

東京大学大学院理学系研究科物理 Topological Order and Quantum Dynamics in Quantum ManySynge Todo
body Systems
学専攻

256 拡張アンサンブル法による複雑系の研究
257

汎関数くりこみ群を用いたキタエフスピン液体の動力学の研究258 両親媒性分子凝集体の大変形プロセス259

２次元反強磁性体の巨大磁気応答における不純物効果

260 物質科学における並列ベイズ計算
261

267 フラストレート磁性体における新奇秩序
268

量子多体系におけるトポロジカルな秩序と量子ダイナミクス

Nagoya University

Yusuke KatoThe University ofTokyo

Large deformation process of amphiphilic molecular aggregate Yuji Higuchi

The University ofTokyo

大学院工学研究科 Ground state phase diagram of extended Kitaev model II

The University of
Tokyo

No.

課題名

269

ポリマー材料の巨⼤熱物性データベースの機械
学習⽀援開発270 非平衡定常系の大域的な熱力学関数

氏名

所属

Title

Name

Organization

Liao

Yuxuan 東京大学機械工学専攻

Machine-learning-assisted Development of Giant ThermalProperty Database for Polymer Materials

Yuxuan Liao

The University of
Tokyo

中川

尚子

茨城大学理学部

Global thermodynamic functions extended to nonequilibrium
steady states

Naoko Nakagawa

Ibaraki University

Toru Sakai

University of Hyogo

271

S=2 反強磁性鎖における対称性に守られたトポ
ロジカル相

坂井

徹

兵庫県立大学大学院物質理学研究 Symmetry Protected Topological Phase of the S=2
antiferromagnetic chain
科

272

量子スピン系の低エネルギー状態に関する数値
的研究

中野

博生

兵庫県立大学大学院物質理学研究
Numerical study on low-energy states of quantum spin systems Hiroki Nakano
科273

フラストレーション系に現れる相転移と臨界現象の動的スケーリング解析

尾関之康

電気通信大学情報理工学研究科

Dynamical scaling analysis for phase transitions and criticalphenomena in frustrated systems

Yukiyasu Ozeki

The University
of ElectroCommunications274

圧力下における Sr および Ag をドープした
Bi2Se3Jeschke
Harald

岡山大学異分野基礎科学研究所

Sr and Ag doped Bi2Se3 under pressure

Harald Jeschke

Okayama University

275

高分子流体・固体のマルチスケールシミュレー
ション

村島

隆浩

東北大学大学院理学研究科

Multiscale simulation of polymeric fluids and solids

Takahiro Murashima Tohoku University

276

マルチスケール流動シミュレーション用プラッ
トフォームを用いた複雑流動の解析

川勝年洋

東北大学大学院理学研究科物理学 Analyses on complex fluids using multiscale simulation
platform
専攻

岡本

祐幸

名古屋大学大学院理学研究科

徹

兵庫県立大学大学院物質理学研究 Numerical Diagonalization Study on the Field-Induced Spin
Nematic Liquid科

277 拡張アンサンブル法による複雑系の研究

ISSP Activity Report 2020

147

278

磁場誘起スピンネマティック液体の数値対角化
による研究

坂井

279

Numerical study of spin-nematic order in the S=1/2
J1 J2 K-Heisenberg model on the square lattice

ゴウケ
ィアス

280

カゴメ格子上の J1-J2 反強磁性体の古典モンテカ
品岡
ルロ計算

寛

281

ポリマー材料の巨大熱物性データベースの機械
学習支援開発Yuxuan 東京大学機械工学専攻282

擬 1 次元 Cr ニクタイドにおける超伝導の理論研 Jeschke
究
Harald283

産業や医療に有用な新規タンパク質の合理的設
計

新井

284

フラストレートした量子磁性体に対する熱ゆら
ぎの効果

285

フラストレーション系に現れる相転移と臨界現象の動的スケーリング解析 II

University of Hyogo

Toshihiro Kawakatsu Tohoku University

Study on complex systems by generalized-ensemble algorithms Yuko Okamoto

Nagoya University

Toru Sakai

University of Hyogo

沖縄科学技術大学院大学

Numerical study of spin-nematic order in the S=1/2 J1 J2
K-Heisenberg model on the square lattice

Matthias Gohlke

Okinawa Institute of
Science and Technology
Graduate University

埼玉大学理学部物理学科

Classical Monte Carlo study of J1-J2 Heisenberg
antiferromagnet on the kagome lattice

Hiroshi Shinaoka

Saitama University

Machine-learning-assisted Development of Giant ThermalProperty Database for Polymer Materials

Yuxuan Liao

The University ofTokyo

岡山大学異分野基礎科学研究所

Theory for Superconductivity in quasi-one-dimensional Crbased pnictides

Harald Jeschke

Okayama University

宗仁

東京大学大学院総合文化研究科

Computational rational design of novel proteins for industrial
and pharmaceutical applications

Munehito Arai

The University of
Tokyo

下川

統久朗

沖縄科学技術大学院大学

Thermal effects on quantum frustrated magnetisms

Tokuro Shimokawa

Okinawa Institute of
Science and Technology
Graduate University

尾関之康

電気通信大学情報理工学研究科

Dynamical scaling analysis for phase transitions and criticalphenomena in frustrated systems II

Yukiyasu Ozeki

The University
of ElectroCommunications

Liao

マテ

148

No.

課題名

氏名

所属

Title

Name

Organization

ISSP Activity Report 2020

Ground-state phase diagram of extended Kitaev model on ahoneycomb lattice

Takafumi Suzuki

University of Hyogo

Study of new ordered phase and nonequilibrium phenomenain quasicrystals

Akihisa Koga

Tokyo Institute ofTechnology

Investigation of the molecular origins of the mechanical and
東京大学大学院新領域創成科学研
thermal properties of realistic bio-polymers using all-atomistic
究科物質系専攻
molecular dynamics

Susumu Okazaki

The University of
Tokyo

統久朗

沖縄科学技術大学院大学

Thermal effects on quantum frustrated magnetisms

Tokuro Shimokawa

Okinawa Institute of
Science and Technology
Graduate University

福島孝治

東京大学大学院総合文化研究科

Tensor renormalization-group study of spin glasses

Koji Hukushima

The University ofTokyo

291 相転移キネティクスとポリアモルフィズム

渕崎

員弘

愛媛大学理工学研究科

Kinetics of phase transition and polyamorphism

Kazuhiro Fuchizaki

Ehime University

292 エンタングルメント最適化法の開発

原田健自

京都大学大学院情報学研究科

Development of entanglement optimization method

Kenji Harada

Kyoto University

293 エンタングルメント最適化法の開発

原田健自

京都大学大学院情報学研究科

Development of entanglement optimization method

Kenji Harada

Kyoto University

吉留

崇

東北大学大学院工学研究科

A theoretical study for thermal unfolding of proteins with quite
Takashi Yoshidome
similar native structure橋本

保

産業技術総合研究所

Molecular dynamics simulation of liquid BaTiO3

286 蜂の巣格子上拡張キタエフ模型の基底状態相図

鈴木隆史

兵庫県立大学

準結晶系における新規秩序相と非平衡現象の探
索

古賀

昌久

東京工業大学進

下川

290 テンソルくりこみ群によるスピングラス研究287

全原子分子動力学シミュレーションによる実在系バ
288 イオポリマーの力学的特性及び熱的特性発現の分子 岡崎
機構の解明

289

294

フラストレートした量子磁性体に対する熱ゆらぎの効果

天然構造が極めて類似したタンパク質における熱変性の理論研究

295 液体 BaTiO3 の分子動力学シミュレーション

大学院工学研究科

Tamotsu Hashimoto

Tohoku University
National Institute ofAdvanced Industrial Scienceand Technology (AIST)

296

量子スピン系の低エネルギー状態に関する数値
的研究

中野

博生

兵庫県立大学大学院物質理学研究
Numerical study on low-energy states of quantum spin systems Hiroki Nakano
科297

遠隔系間に光誘起されるフォノン量⼦もつれ状態のダイナミクス

石田邦夫

宇都宮大学大学院工学研究科

Dynamics of phonon entanglement creation between remote
electron- phonon systems

Kunio Ishida

Utsunomiya University298

テンソルネットワーク法を用いた相転移・臨界
現象の解明

森田

悟史

東京大学物性研究所

Study of phase transitions and critical phenomena by tensor
network methods

Satoshi Morita

The University of
Tokyo

299

拡張準古典方程式を用いた熱ホール効果の磁場依存性北北海道大学理学部物理学科

Magnetic field dependence of the thermal Hall effect based on
Takafumi Kita
the augmented quasiclassical equations

300

フラストレート磁性体における多重 q 秩序状態のスピン伝導・熱伝導青山和司

大阪大学大学院理学研究科宇宙地Transport properties of multiple-q states in frustrated magnets Kazushi Aoyama
球専攻

Osaka University渕崎

員弘

愛媛大学理工学研究科

Kazuhiro Fuchizaki

Ehime University

Hiroki Nada

National Institute forAdvanced Industrial
Science and Technology

301 相転移キネティクスとポリアモルフィズム
302

水と水溶液の大規模メタダイナミクスシミュレ
ーション

灘

孝文

浩樹

Kinetics of phase transition and polyamorphism

産業技術総合研究所環境創生研究 Large-scale metadynamics simulations for water and aqueous
solutions
部門

University of Hyogo

Hokkaido University

No.

課題名

氏名

所属

303

テンソルくりこみ群による相転移・臨界現象の
解明

森田

悟史

東京大学物性研究所

304 誤差付き有効モデル推定

田村亮

305 液膜破壊を伴う流動現象の分子動力学計算

渡辺宙志

過飽和炭酸カルシウム水溶液に現れる多様なク
306 ラスター構造のメタダイナミクスシミュレーシ
ョン解析

灘

浩樹

Title

Name

Organization

Study of phase transitions and critical phenomena by tensor
renormalization group

Satoshi Morita

The University ofTokyo

国立研究開発法人 物質・材料研
究機構

Effective model estimation with error bars

Ryo Tamura

National Institute forMaterials Science

慶応義塾大学理工学部

Molecular Dynamics Study of Crown Formation During theSplashHiroshi Watanabe

Keio University

Metadynamics Simulation Analysis of Various Cluster
産業技術総合研究所環境創生研究
Structures Appearing in Calcium Carbonate Supersaturated
部門
Solution

Hiroki Nada

National Institute forAdvanced Industrial
Science and Technology

ISSP Activity Report 2020307

結晶粒界・異相界面におけるフォノン散乱機構の系統的解析

藤井進

ファインセラミックスセンターナ Systematic Investigation on Phonon Transport at NanoscaleInterfaces
ノ構造研究所Susumu Fujii

Japan Fine Ceramics
Center308

非平衡分子動力学シミュレーションによるアミロイド線維破壊の研究奥村久士

自然科学研究機構生命創成探究セ Disruption of amyloid fibril by nonequilibrium molecular
dynamics simulations
ンター

Hisashi Okumura

Institute for Molecular
Science309

ハニカム格子上の多スピン交換模型における磁
性

安田

千寿

琉球大学理学部

Magnetism in the multiple-spin exchange model on thehoneycomb lattice

Chitoshi Yasuda

University of the
Ryukyus310

テンソルネットワーク法によるスピンの大きい量子系の相転移の研究

金子

隆威

近畿大学

Tensor-network study of phase transitions in large spin systems Ryui Kaneko

Kinki University

311

ニューラルネットワークによる開放量子ダイナ
ミクスの数値手法開発

吉岡信行

理化学研究所

Developing numerical tool for open quantum dynamics basedon neural networks

Nobuyuki Yoshioka

RIKEN

312 機械学習を用いたコード最適化の並列化の検討渡辺宙志

慶応義塾大学理工学部

Code Optimization using Machine Learning on Parallel
ComputerHiroshi Watanabe

Keio University

メゾスコピック素子における断熱ポンピングの
理論

加藤

岳生

東京大学物性研究所

Theory of Adiabatic Pumping in Mesoscopic Devices

Takeo KatoThe University of
Tokyo

小野

頌太

岐阜大学

Unified understanding of the femtosecond infrared
luminescence for metals

Shota Ono

Gifu University

313

314 金属のフェムト秒赤外発光の統一理解

149

315

ハニカム格子上の多スピン交換模型における磁
性

安田

千寿

琉球大学理学部

Magnetism in the multiple-spin exchange model on thehoneycomb lattice

Chitoshi Yasuda

University of the
Ryukyus316

Z2 渦トポロジカル転移のテンソル繰り込みによ
る研究

押川

正毅

東京大学物性研究所

An exploration of the topological phase transition driven by Z2
Masaki Oshikawa
vortex with Tensor Network Renormalization

The University of
Tokyo

317

双極子相互作用が存在する磁性薄膜における非平衡状態の磁気構造小松尚登

物質・材料研究機構

Magnetic structures under the non-equilibrium state of themagnetic thin films with the dipolar interaction

Hisato Komatsu

National Institute forMaterials Science318 磁性体における相転移に伴うスピン伝導青山

和司

大阪大学大学院理学研究科宇宙地
Spin transport near a phase transition in magnets
球専攻

Kazushi Aoyama

Osaka University

319 イジングマシンにおける新規アルゴリズム構築

田中宗慶應義塾大学理工学部物理情報工
Building Algorithms for Ising Machines
学科

Shu Tanaka

Keio University

150

No.

課題名

320

遠隔系間に光誘起されるフォノン量子もつれ状態のダイナミクス

ISSP Activity Report 2020

321 ペーストの流れの記憶の多様性322

近藤量子ドットを介した断熱電荷ポンピングの
数値計算

323 量子パイロクロア磁性体の磁気励起研究

氏名

所属

Title

Name

Organization

石田邦夫

宇都宮大学大学院工学研究科

Dynamics of phonon entanglement creation between remote
electron-phonon systems

Kunio Ishida

Utsunomiya University

中原明生

日本大学理工学部（物理）

Diversity in memory effects of flow in paste

Akio Nakahara

Nihon University

加藤岳生

東京大学物性研究所

Numerical Study of Adiabatic Charge Pumping through Kondo
Takeo Kato
Quantum DotsThe University of
Tokyo

佐藤

卓

東北大学多元物質科学研究所

Magnetic excitations in the quantum pyrochlore magnet

Taku Sato

Tohoku University

Hiroaki Kadowaki

Tokyo Metropolitan
University
Kumamoto University

一般教育教室324

厳密対角化と TPQ 法による量子パイロクロア磁
門脇
性体の研究

広明

首都大学東京 理工学研究科 物理
Exact diagonalization and TPQ of quantum pyrochlore model
学専攻

325

スパース推定による広域 X 線吸収微細構造計測の解析手法の確立

熊添博之

熊本大学パルスパワー科学研究所

Establishment of new analysis method for extend X-ray
absorption fine structure with sparse modeling

Hiroyuki Kumazoe

326

高分子流体・固体のマルチスケールシミュレー
ション

村島

隆浩

東北大学大学院理学研究科

Multiscale simulation of polymeric fluids and solids

Takahiro Murashima Tohoku University327

１次元フラストレート量子スピン系の数値的研
究

飛田

和男

埼玉大学大学院理工学研究科物質 Numerical Study of One Dimensional Frustrated Quantum Spin
Kazuo Hida
Systems
科学部門

328 質量保存型反応拡散系の粗大化ダイナミクス

舘野道雄

東京大学 大学院総合文化研究科

Coarsening mechanism in mass-conserved reaction diffusion
systems

Michio Tateno

The University ofTokyo

329 コロイド粒子系に関する分子シミュレーション

寺尾貴道

岐阜大学工学部

Molecular simulation of colloidal particles

Takamichi Terao

Gifu University

330 高密剛体球系における非平衡相転移と遅い緩和

礒部

雅晴

名古屋工業大学

Nonequilibrium phase transition and slow dynamics in thedense hard sphere systems

Masaharu Isobe

Nagoya Institute ofTechnology

331

非平衡環境と接した定常状態の普遍的性質の解
明

白井

達彦

早稲田大学基幹理工学部

Universal properties of non-equilibrium steady states

Tatsuhiko Shirai

Waseda University

332

ソフトマテリアルの秩序構造とそのダイナミク
ス，光学的性質の計算

福田

順一

九州大学

Calculation of ordered structures, dynamics and opticalproperties of soft materials

Jun-ichi Fukuda

Kyushu University

333

厳密対角化による量子パイロクロア磁性体の研
究

門脇

広明

首都大学東京 理工学研究科 物理
Exact diagonalization of quantum pyrochlore model
学専攻

Hiroaki Kadowaki

Tokyo Metropolitan
University334

空間構造をもつ一次元量子スピン系の数値的研究

利根川

335 ⾮平衡定常系の⼤域的な熱⼒学関数336

中川

ケージドルシフェリン化合物およびその共役酸・樋山
塩基の電子励起状態

大学院理学研究院

Saitama University

神戸大学大学院理学研究科

Numerical Study of the One-Dimensional Quantum Spin
Systems with Spatial Structures

Takashi Tonegawa

Kobe University

尚子

茨城大学理学部

Global thermodynamic functions extended to nonequilibrium
steady states

Naoko Nakagawa

Ibaraki University

みやび

群馬大学

Theoretical study for caged compound and its conjugate acid/bases

Miyabi Hiyama

Gunma University

孝

No.

課題名

337

ソフトマテリアルの秩序構造とそのダイナミク
ス，光学的性質の計算

福田

順一

九州大学

338

Z2 渦トポロジカル転移のテンソル繰り込みによ
る研究

押川

正毅

339

超構造によるバンドエンジニアリングとその応用苅宿

340 コロイド粒⼦系に関する分⼦シミュレーション
キタエフスピン液体のスピンゼーベック効果の
数値計算

341

342 摩擦の物理343

空間構造をもつ一次元量子スピン系の数値的研究344 Phase field 法による多細胞シミュレーション

氏名所属
大学院理学研究院

Title
Calculation of ordered structures, dynamics and opticalproperties of soft materials

Name

Organization

Jun-ichi Fukuda

Kyushu University

東京大学物性研究所

An exploration of the topological phase transition driven by Z2
Masaki Oshikawa
vortices with Tensor Network Renormalization

The University of
Tokyo

俊風

物材機構

Superstructure based band engineering and its application

Toshikaze Kariyado

NIMS

寺尾

貴道

岐阜大学工学部

Molecular simulation of colloidal particles

Takamichi Terao

Gifu University

山田

昌彦

大阪大学基礎工学研究科

Numerical simulation of the spin Seebeck effect in Kitaev spin
liquids

Masahiko Yamada

Osaka University

松川宏

青山学院大学理工学部

Physics of Friction

Hiroshi Matsukawa

Aoyama Gakuin
University

神戸大学大学院理学研究科

Numerical Study of the One-Dimensional Quantum Spin
Systems with Spatial Structures

Takashi Tonegawa

Kobe University

Michio Tateno

The University of
Tokyo

利根川

孝

ISSP Activity Report 2020

舘野道雄

東京大学 大学院総合文化研究科 Multicellular simulation by phase field method345

球体カゴメ系 {W72V30} の状態密度，動的構造因
福元
子の計算

好志

東京理科大学

Exact diagonalization calculations of density of states anddynamical structure factor for the spherical-kagome spinsystem {W72V30}

Fukumoto Yoshiyuki

Tokyo University of
Science346

サイト変調された揺らぎを用いたアニーリング
技術の創出

白井

達彦

早稲田大学基幹理工学部

Quantum annealing with inhomogeneous fluctuations

Tatsuhiko Shirai

Waseda University347

二次元物質の積層を中心とした超構造による新
奇物性探索

苅宿

俊風

物材機構

Study of superstructure induced novel phenomena: stacking ofToshikaze Kariyado
atomically thin materials

NIMS

348

タンパク質動的プロセス解析法：低温電子顕微
鏡実験と分子シミュレーションの統合

吉留崇

東北大学大学院工学研究科

A Method for Analyzing Protein Dynamics: A Hybrid of CryoElectron Microscopy Experiment and Molecular Simulation

Takashi Yoshidome

Tohoku University

量子アニーリング機械を目指した近接相互作用
349 量子ビット系のパルス操作による全結合実装方
式の検討

棚本

哲史

帝京大学

All to all connections in two dimensional qubit array with
two-body interactions aiming at quantum annealing machine

Tetsufumi Tanamoto Teikyo University

350 金属のフェムト秒赤外発光の統一理解 II

小野

頌太

岐阜大学

Unified understanding of the femtosecond infrared
luminescence for metals: II

Shota Ono

Gifu University

151

351

１次元フラストレート量子スピン系の数値的研
究

飛田

和男

埼玉大学大学院理工学研究科物質 Numerical Study of One Dimensional Frustrated Quantum Spin
Kazuo Hida
Systems
科学部門

352

空間反転対称な遍歴磁性体における多重ヘリカ
ルスピン密度波内田尚志

北海道科学大学

Multiple helical spin density waves in inversion-symmetricitinerant magnets

Takashi Uchida

Hokkaido Universityof Science353

球体カゴメ系 {W72V30} の磁気的性質へのランダ
福元
ムネスの効果好志

東京理科大学

Effects of exchange randomness on magnetic properties of aspherical-kagome spin-system {W72V30}

Fukumoto Yoshiyuki

Tokyo University of
Science

Saitama University

152
ISSP Activity Report 2020

No.

課題名

氏名

所属

354

駆動力に対する込み合い細胞運動の応答理論の
構築

松下

勝義

大阪大学理学研究科

Construction of Response Theory for Motion of Crowding Cells

Katsuyoshi
Matsushita

Osaka University355

X 線結晶構造解析における 2 波近似理論の破れ
の研究

沖津

康平

東京大学 大学院工学系研究科

Study on bankruptcy of the two-beam approximation in X-ray
crystal structure analysis

Kouhei Okitsu

School of Engineering,
The University of
Tokyo

356

時間反転対称性の破れた超伝導体接合の数値解
析法の研究

田沼

慶忠

秋田大学大学院理工学研究科

Study on numerical analysis method of superconducting
junctions with broken time reversal symmetry states

Yasunari Tanuma

Akita University佐藤卓

東北大学多元物質科学研究所

Magnetic excitations in the quantum pyrochlore magnet

Taku Sato

Tohoku University

東京大学生産技術研究所

Molecular Dynamics Calculation of Non-equilibrium SteadyState in Systems with Temperature Gradient

Naomichi Hatano

The University of
Tokyo

名古屋大学

Non-uniform thermal transport properties in proteins

Takahisa Yamato

Nagoya University

Miyabi Hiyama

Gunma University

357 量子パイロクロア磁性体の磁気励起研究
358

温度勾配のある系の非平衡定常状態の分子動力学計算

359 タンパク質中の不均一な熱輸送物性の解析

羽田野
倭

直道

剛久

Title

Name

Organization

360

ホタル生物発光関連分子の吸収 / 蛍光スペクトル
樋山
解析

みやび

群馬大学

Theoretical analysis for photo absorption- and emission
spectra for firefly bioluminescence related molecules361

固有値ソルバの統一的インターフェース Rokkoの開発と量子スピン系への応用

坂下

達哉

玉川大学

Development of integrated interface of eigensolvers Rokko andTatsuya Sakashita
application to quantum spin systems

Tamagawa University362

DNA の引っ張りシミュレーションによる巻き戻
水口
し機構の解明朋子

京都工芸繊維大学

DNA unwinding mechanism studied by steered molecular
dynamics simulations

Tomoko Mizuguchi

Kyoto Institute ofTechnology

Katsuyoshi
Matsushita

Graduate Schoolof Science, Osaka
University

363 集団運動での細胞込み合い状況下での多体効果

松下勝義

大阪大学理学研究科

Many body effects in the collective motion of crowding cells

固有値ソルバの統一的インターフェース Rokkoの開発と量子スピン系への応用

坂下

達哉

玉川大学

Development of integrated interface of eigensolvers Rokko andTatsuya Sakashita
application to quantum spin systems

Tamagawa University

内田尚志

北海道科学大学

Multiple-Q states in two-dimensional itinerant magnets

Hokkaido Universityof Science364

365 二次元遍歴磁性体における多重 Q 状態

Takashi Uchida令和２年度 スーパーコンピュータ計算物質科学スパコン共用事業課題一覧/ Supercomputing Consortium for Computational Materials Science Project List of Supercomputer System 2020
前期 / The first half term
No.

課題名

氏名

1

低次元過冷却液体における粘弾性緩和の大規模
分子動力学計算芝2

物質設計に向けた Wannier 関数データベースの
作成

吉見

3

鉄系超伝導体関連物質の系統的な低エネルギー
有効模型導出・解析

所属

Title

Name

Organization

ISSP Activity Report 2020東京大学

情報基盤センタ Large-scale molecular dynamics simulation of viscoelastic
relaxation in a two-dimensional supercooled liquidー

Hayato Shiba

The University of
Tokyo

一慶

東京大学

物性研究所

Creating a Wannier function database toward material design

Kazuyoshi Yoshimi

The University of
Tokyo

三澤

貴宏

東京大学

物性研究所

Systematic derivation and analysis of low-energy effectivemodels for iron based superconductors and related materials

Takahiro Misawa

The University of
Tokyo

4

大規模 GW/BSE 法による有機薄膜太陽電池の光
藤田
電変換過程の解析

貴敏

分子科学研究所

5

二次電池材料の電子論

小口

多美夫

大阪大学

産業科学研究所 Electron Theory on Secondary-Battery Materials

Tamio Oguchi

Osaka University

6

貴金属フリーの汎用元素ナノ触媒に向けた第一
原理計算

武次

徹也

北海道大学

大学院理学研究 Ab initio study toward abundant element nanocatalysts withless precious metals
院

Tetsuya Taketsugu

Hokkaido University

7

大規模計算とデータ駆動手法による高性能永久
磁石の開発

三宅

隆

産業技術総合研究所

Takashi Miyake

National Institute ofAdvanced Industrial
Science and Technology

8ナトリウムイオン電池用水系電解液のイオン輸送機構の理論的解析

山田

淳夫

東京大学

9

量子ビーム実験と第一原理計算の融合による磁性材料の最適化小野寛太

高エネルギー加速器研究機構Optimized design of magnetic materials based on the
integration between quantum beam experiment and firstprinciples calculation

Kanta Ono

High Energy
Accelerator Research
Organization10

3 次元量子スピン液体の追究

今田正俊

早稲田大学 / 豊
田理化学研究所

Studies on quantum spin liquids in three dimensions

Masatoshi Imada

Waseda University/Toyota
Physical and Chemical
Research Institute11

省エネルギー次世代半導体デバイス開発のための量子論マルチシミュレーション

押山

淳

名古屋大学

未来材料・シス Quantum-theory-based multiscale simulation for nextgeneration power devices
テム研究所

Atsushi Oshiyama

Nagoya University

芝

隼人

東京大学

情報基盤センタ Development of all atom molecular simulation framework on a
Hayato Shiba
mesoscaleー

隼人

Investigation of charge photogeneration process in organic
thin film solar cells by large-scale GW/Bethe-Salpeter equation Takatoshi FujitamethodDevelopment of high-performance permanent magnets bylarge-scale simulation and data-driven approach

大学院工学系研 Theoretical analysis on ion conduction mechanism in aqueous
Atsuo Yamada
electrolytes for sodium-ion battery
究科

Institute for Molecular
Science

The University ofTokyo

後期 / The second half term

153

12

メソスケール全原子分子動力学フレームワーク
開発

13

フラグメント分割型 GW/BSE 法による有機太陽
藤田
電池の電荷分離過程の解析

貴敏

分子科学研究所

Computational Investigation of Charge Photogeneration in
Organic Solar Cells by Fragment-Based GW/BSE Method

Takatoshi Fujita

The University ofTokyo
Institute for Molecular
Science154
ISSP Activity Report 202014

ハイドレートメルト電解液の特異なイオン輸送機構の理論的解析

山田

淳夫

東京大学

15

機械学習による超伝導機構の解析

今田正俊

早稲田大学 / 豊
田理化学研究所

16

省エネルギー次世代半導体デバイス開発のための量子論マルチシミュレーション

押山

淳

17

全原子分子動力学シミュレーションを用いた
chain-increment 法によるポリマーブレンド相溶 松林
性評価

18

磁性材料の第一原理計算

19

大学院工学系研 Theoretical Analysis of Unusual Ion Transport Mechanism in
Hydrate Melt Electrolyte
究科

Atsuo Yamada

The University ofTokyo

Analyses on Superconducting Mechanism by Machine
Learning

Masatoshi Imada

Waseda University/Toyota
Physical and Chemical
Research Institute名古屋大学

未来材料・シス Quantum-theory-based multiscale simulation for nextgeneration power devices
テム研究所

Atsushi Oshiyama

Nagoya University

伸幸

大阪大学

Evaluation of the polymer blend miscibility by using chain大学院基礎工学
increment method with all-atom molecular dynamics
研究科
simulation

Nobuyuki
Matubayasi

Osaka University

合田義弘

東京工業大学

物質理工学院

First-principles study of magnetic materials

Yoshihiro Gohda

Tokyo Institute ofTechnology

遷移金属酸化物材料の機能性

杉野

修

東京大学

物性研究所

Functionality of transition metal oxides

Osamu Sugino

The University of
Tokyo

20

大規模数値計算による高性能永久磁石の開発

福島

鉄也

東京大学

物性研究所

Large-scale simulation for permanent magnets

Tetsuya Fukushima

The University of
Tokyo

21

全固体ナトリウム金属電池創成のための新規塩
化物固体電解質材料の探索

中山将伸

名古屋工業大学

Novel chloride solid electrolytes for all solid-state sodium
metal battery

Masanobu
Nakayama

Nagoya Institute ofTechnology

ISSP Activity Report 2020

155

Publications
Division of Condensed Matter Science
Takigawa group
We have been performing nuclear magnetic resonance experiments on various quantum spin systems and strongly correlated
electron systems to explore novel quantum phases with exotic ordering and fluctuation phenomena. The major achievementsin the year 2020 include: (1) development of systematic methods to identify symmetries of ordered phases with electronic
multipoles from the angle dependence of the NMR Knight shift and their application to 111Cd-NMR measurements in the spinorbit coupled metallic pyrochlore compound Cd2Re2O7, (2) quantitative determination of magnetic-field-induced dipolar andoctupolar moments in the low-temperature ordered phases of the 5d double-perovskite oxide Ba2MgReO6 based on the 17O
NMR experiments. In this material, strong spin-orbit coupling combined with the cubic crystal field generates a quartet groundstate with Jeff = 3/2, providing ideal platform to explore multipolar order of t2g electron systems.
1.

*Field-Orientation Effect on Ferro-Quadrupole Order in PrTi Al : S. Kittaka, T. Taniguchi, K. Hattori, S. Nakamura,
2 20

T. Sakakibara, M. Takigawa, M. Tsujimoto, A. Sakai, Y. Matsumoto and S. Nakatsuji, J. Phys. Soc. Jpn. 89, 043701(1-4)(2020).

2.

Regular-triangle trimer and charge order preserving the Anderson condition in the pyrochlore structure of CsW2O6:
Y. Okamoto, H. Amano, N. Katayama, H. Sawa, K. Niki, R. Mitoka, H. Harima, T. Hasegawa, N. Ogita, Y. Tanaka,
M. Takigawa, Y. Yokoyama, K. Takehana, Y. Imanaka, Y. Nakamura, H. Kishida and K. Takenaka, Nat Commun 11,3144-1-8 (2020).

3.

*Pressure-induced phase transition in the J -J square lattice antiferromagnet RbMoOPO Cl: H. Takeda, T. Yamauchi,
1 2
4

4.

*PrTi Al における強四極子秩序変数の磁場によるスイッチング - 磁場に依存する四極子間相互作用について -: 谷口 貴紀 ,2 20

M. Takigawa, H. Ishikawa and Z. Hiroi, Phys. Rev. B 103, 104406 (2021).

服部 一匡 , 橘高 俊一郎 , 瀧川 仁 , 固体物理 55, 245-264 (2020).

Sakakibara group
We investigated the magnetic phase transitions of the cubic chiral magnet EuPtSi by means of high-precision magnetization measurements and established the magnetic phase diagrams. The incommensurate-commensurate transition in the helicalstate with a tiny change in the propagation vectors was detected exclusively by the magnetization along the [111] direction.
The transition temperature TN* shifted to lower temperature with increasing H // [111]. The ground-state magnetizations of
the helical state for H // [100] and [111] were examined at temperatures below 100 mK. We found evidence that the q vectors
pinned to the lattice at low fields were depinned by increasing fields above 10 kOe and gradually rotated towards the field directions. Metastable skyrmion phase can be created at 60 mK by slowly cooling in a field. We obtained the ground-state magnetization of the skyrmion lattice state, showing a sharp tilted plateau structure. The transitions from the skyrmion phase to theconical phase by changing fields were perfectly discontinuous at 60 mK possibly because of the supercooled dynamics.
1.

*105Pd NMR and NQR study of the cubic heavy fermion system Ce Pd Si : I. Jakovac, M. Horvatic, E. F. Schwier,
3 20 62.

*Field-Orientation Effect on Ferro-Quadrupole Order in PrTi Al : S. Kittaka, T. Taniguchi, K. Hattori, S. Nakamura,
2 20

3.

†*Heavy Fermion State of YbNi Si without Local Inversion Symmetry: S. Nakamura, K. Hyodo, Y. Matsumoto,2 3

4.

*Kitaev Spin Liquid Candidate Os Cl Comprised of Honeycomb Nano-Domains: K. Kataoka, D. Hirai, T. Yajima,x 3

A. Prokofiev, S. Paschen, H. Mitamura, T. Sakakibara and M. S. Grbic, J. Phys.: Condens. Matter 32, 245601(1-7)(2020).
T. Sakakibara, M. Takigawa, M. Tsujimoto, A. Sakai, Y. Matsumoto and S. Nakatsuji, J. Phys. Soc. Jpn. 89, 043701(1-4)(2020).

Y. Haga, H. Sato, S. Ueda, K. Mimura, K. Saiki, K. Iso, M. Yamashita, S. Kittaka, T. Sakakibara and S. Ohara, J. Phys.
Soc. Jpn. 89, 024705(1-5) (2020).
D. Nishio-Hamane, R. Ishii, K.-Y. Choi, D. Wulferding, P. Lemmens, S. Kittaka, T. Sakakibara, H. Ishikawa, A. Matsuo,
K. Kindo and Z. Hiroi, J. Phys. Soc. Jpn. 89, 114709(1-9) (2020).
* Joint research among groups within ISSP.

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5.

†*Emergent spin-1 Haldane gap and ferroelectricity in a frustrated spin- 1/2 ladder: H. Ueda, S. Onoda, Y. Yamaguchi,

6.

†Fully gapped superconductivity without sign reversal in the topological superconductor PbTaSe : Y. Sun, S. Kittaka,
2

T. Kimura, D. Yoshizawa, T. Morioka, M. Hagiwara, M. Hagihala, M. Soda, T. Masuda, T. Sakakibara, K. Tomiyasu,
S. Ohira-Kawamura, K. Nakajima, R. Kajimoto, M. Nakamura, Y. Inamura, N. Reynolds, M. Frontzek, J. S. White,
M. Hase and Y. Yasui, Phys. Rev. B 101, 140408(1-6) (2020).
T. Sakakibara, K. Machida, R. Sankar, X. Xu, N. Zhou, X. Xing, Z. Shi, S. Pyon and T. Tamegai, Phys. Rev. B 102,024517(1-7) (2020).

7.

†Magnetic properties of a spin-1/2 honeycomb lattice antiferromagnet: Y. Kono, T. Okabe, N. Uemoto, Y. Iwasaki,

8.

†Magnetic properties of a spin-2 antiferromagnet with metal-radical hybrid spins: Y. Iwasaki, T. Okabe, N. Uemoto,9.

†Synthesis and Magnetic Properties of M2+Ti4+ Substituted Ba

Y. Hosokoshi, S. Kittaka, T. Sakakibara and H. Yamaguchi, Phys. Rev. B 101, 014437(1-6) (2020).

Y. Kono, Y. Hosokoshi, S. Nakamura, S. Kittaka, T. Sakakibara, M. Hagiwara, T. Kawakami and H. Yamaguchi, Phys.
Rev. B 101, 174412(1-6) (2020).

12Fe28Ti15O84: N. Yasuda, S. Kittaka, Y. Kono, T. Sakakibara, K. Kakizaki and K. Kamishima, J. Magn. Soc. Jpn. 44, 2005R004(1-5) (2020).

10. *Magnetization and Thermal Expansion Properties of Quantum Spin Ice Candidate Pr2Zr2O7: N. Tang, A. Sakai,
K. Kimura, S. Nakamura, M. Fu, Y. Matsumoto, T. Sakakibara and S. Nakatsuji, JPS Conf. Proc. 30, 011090(1-6)(2020).
11. *Single Crystal Growth and Unique Electronic States of Cubic Chiral EuPtSi and Related Compounds: Y. Ônuki,
M. Kakihana, W. Iha, K. Nakaima, D. Aoki, A. Nakamura, F. Honda, M. Nakashima, Y. Amako, J. Gouchi, Y. Uwatoko,
S. Nakamura, T. Sakakibara, T. Takeuchi, Y. Haga, H. Ikeda, H. Harima, M. Hedo and T. Nakama, JPS Conf. Proc. 29,012001(1-9) (2020).
12. *Unique Skyrmion Phases and Conduction Electrons in Cubic Chiral Antiferromagnet EuPtSi and Related Compounds:
Y. Ônuki, M. Kakihana, W. Iha, K. Nakaima, D. Aoki, A. Nakamura, F. Honda, M. Nakashima, Y. Amako, J. Gouchi,
Y. Uwatoko, S. Nakamura, T. Sakakibara, T. Takeuchi, Y. Haga, H. Ikeda, H. Harima, M. Hedo and T. Nakama, JPS
Conf. Proc. 30, 011008(1-11) (2020).
13. *Improved accuracy in high-frequency AC transport measurements in pulsed high magnetic fields: H. Mitamura,
R. Watanuki, E. Kampert, T. Förster, A. Matsuo, T. Onimaru, N. Onozaki, Y. Amou, K. Wakiya, K. T. Matsumoto,I. Yamamoto, K. Suzuki, S. Zherlitsyn, J. Wosnitza, M. Tokunaga, K. Kindo and T. Sakakibara, Review of Scientific
Instruments 91, 125107/1-25 (2020).
14. Orientation of point nodes and nonunitary triplet pairing tuned by the easy-axis magnetization in UTe2: S. Kittaka,
Y. Shimizu, T. Sakakibara, A. Nakamura, D. Li, Y. Homma, F. Honda, D. Aoki and K. Machida, Phys. Rev. Research 2,
032014(R)(1-6) (2020).
15. †Evidence for nematic superconductivity of topological surface states in PbTaSe2: T. Le, Y. Sun, H.-K. Jin, L. Che,
L. Yin, J. Li, G. Pang, C. Xu, L. Zhao, S. Kittaka, T. Sakakibara, K. Machida, R. Sankar, H. Yuan, G. Chen, X. Xu,
S. Li, Y. Zhou and X. Lu, Science Bulletin 65, 1349-1355 (2020).
16. *PrTi2Al20 における強四極子秩序変数の磁場によるスイッチング - 磁場に依存する四極子間相互作用について -: 谷口 貴紀 ,服部 一匡 , 橘高 俊一郎 , 瀧川 仁 , 固体物理 55, 245-264 (2020).

Mori group
We have successfully developed and unveiled unprecedented functional properties for the molecular materials and systems.
The major achievements in 2020 are (1) to establish the molecular design strategy of anhydrous base-acid-type organic proton
conductors as an electrolyte of a fuel cell for medium temperatures, (2) to investigate the alkyl-chain-length effect of thetransistor properties for anthracene-based organic semiconductors, and (3) to develop the Zn complex with vapochromism
induced by intermolecular electron transfer coupled with hydrogen-bond formation.
1.

†Anhydrous Purely Organic Solid-State Proton Conductors: Effects of Molecular Dynamics on the Proton Conductivity

2.

水素科学の最前線、新学術領域研究「ハイドロジェノミクス」の挑戦―高速・局所移動水素と電子とのカップリングによる新発想デバイスの設計 : 森 初果 , まてりあ 60, 165-168 (2020).

3.

*A computational examination of the electric-field-induced proton transfer along the interface hydrogen bond betweenof Imidazolium Hydrogen Dicarboxylates: Y. Sunairi, S. Dekura, A. Ueda, T. Ida, M. Mizuno and H. Mori, J. Phys. Soc.
Jpn. 89, 051008 (2020).

proton donating and accepting self-assembled monolayers: Y. Kanematsu, H. S. Kato, S. Yoshimoto, A. Ueda,† Joint research with outside partners.

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S. Yamamoto, H. Mori, J. Yoshinobu, I. Matsuda and M. Tachikawa, Chem. Phys. Lett. 741, 137091 (2020).
4.

*Vapochromism induced by intermolecular electron transfer coupled with hydrogen-bond formation in zinc dithiolene

5.

* 水素を活かすセラミクス

6.

Effect of Alkyl Chain Length on Charge Transport Property of Anthracene-Based Organic Semiconductors: D. Zhang,
S. Yokomori, R. Kameyama, C. Zhao, A. Ueda, L. Zhang, R. Kumai, Y. Murakami, H. Meng and H. Mori, ACS Appl.
Mater. Interfaces 13, 989 (2021).

7.

Terahertz-field-induced polar charge order in electronic-type dielectrics: H. Yamakawa, T. Miyamoto, T. Morimoto,
N. Takamura, S. Liang, H. Yoshimochi, T. Terashige, N. Kida, M. Suda, H. M. Yamamoto, H. Mori, K. Miyagawa,K. Kanoda and H. Okamoto, Nat Commun 12, 953 (2021).

8.

*The Simplest Model for Doped Poly(3,4-ethylenedioxythiophene) (PEDOT): Single-crystalline EDOT Dimer Radical

9.

Modulation of the Electronic States and Magnetic Properties of Nickel Catecholdithiolene Complex by Oxidationcoupled Deprotonation: S. Yokomori, S. Dekura, A. Ueda, R. Kumai, Y. Murakami and H. Mori, J. Mater. Chem. C(2021), accepted for publication.

complex: T. Fujino, M. Kawamura, T. Ozaki and H. Mori, J. Mater. Chem. C 8, 14939-14947 (2020).

プロトンー電子カップル型分子性結晶および二分子膜における機能開拓 : 森 初果 , 加藤 浩之 ,藤野 智子 , 上田 顕 , 吉信 淳 , セラミックス 56, 88-91 (2021).

Cation Salts: R. Kameyama, T. Fujino, S. Dekura, M. Kawamura, T. Ozaki and H. Mori, Chem. Eur. J. 27, 6696 (2021).

Osada group
The nonlinear anomalous Hall effect (AHE) was realized in organic conductors for the first time. First, using interlayer
magnetotransport, we experimentally confirmed that the weak charge ordering (CO) state of a layered organic conductor
α-(BEDT-TTF)2I3 is a two-dimensional massive Dirac fermion (DF) state with a pair of tilted gapped Dirac cones with finite
Berry curvature dipole. Next, we showed that the nonlinear AHE is measurable in the current-carrying state of this massive DF
system, where the Berry curvature balance is broken between two Dirac cones due to non-equilibrium distribution. In addition,
we proposed the current-field-cooling technique, which enhances the formation of single type of CO domains in experiments. Finally, we performed the transport measurement of α-(BEDT-TTF)2I3 in the weak CO state at 1.25GPa, and extracted
nonlinear signal from current-reversed data. We successfully observed nonlinear AHE with estimated order and its rectifying
characteristics.
1.

Possible Current-Induced Phenomena and Domain Control in an Organic Dirac Fermion System with Weak Charge
Ordering: T. Osada and A. Kiswandhi, J. Phys. Soc. Jpn. 89, 103701/1-5 (2020).

2.

Experimental Confirmation of Massive Dirac Fermions in Weak Charge-Ordering State in α-(BEDT-TTF)2I3:
K. Yoshimura, M. Sato and T. Osada, J. Phys. Soc. Jpn. 90, 033701/1-5 (2021).

3.

Possible Nonlinear Anomalous Thermoelectric Effect in Organic Massive Dirac Fermion System: T. Osada andA. Kiswandhi, J. Phys. Soc. Jpn. 90, 053704/1-5 (2021).

4.

黒リン超薄膜の電子構造と物性 : 長田 俊人 ,「グラフェンから広がる二次元物質の新技術と応用」, 第 6 章 10 節 , 吾郷浩樹・
齋藤理一郎 , ( エヌ・ティー・エス , 東京 , 2020), 437-443.

Yamashita group
We have been studying (1) quantum criticality in heavy-fermion materials by ultralow temperature cryostat, (2) thermal-Hall
conductivity of exotic excitations in frustrated magnets and (3) a new technique for the study of strongly-correlated electron
systems. In this year, we have performed (1) developments of ultralow-temperature measurements of thermal expansion of
CeCoIn5 and resistivity of YbRh2Si2, (2) thermal-Hall measurements of Neel-type skyrmions in GaV4Se8, and (3) spintronic
superconductor in EuSn2As2.
1.

Thermal-transport studies of kagomé antiferromagnets: M. Yamashita, M. Akazawa, M. Shimozawa, T. Shibauchi,
Y. Matsuda, H. Ishikawa, T. Yajima, Z. Hiroi, M. Oda, H. Yoshida, H.-Y. Lee, J. H. Han and N. Kawashima, J. Phys.:
Condens. Matter 32, 074001 (2020).

2.

†*Heavy Fermion State of YbNi Si without Local Inversion Symmetry: S. Nakamura, K. Hyodo, Y. Matsumoto,2 3

3.

Presence and absence of itinerant gapless excitations in the quantum spin liquid candidate EtMe3Sb[Pd(dmit)2]2:
M. Yamashita, Y. Sato, T. Tominaga, Y. Kasahara, S. Kasahara, H. Cui, R. Kato, T. Shibauchi and Y. Matsuda, Phys.

Y. Haga, H. Sato, S. Ueda, K. Mimura, K. Saiki, K. Iso, M. Yamashita, S. Kittaka, T. Sakakibara and S. Ohara, J. Phys.
Soc. Jpn. 89, 024705(1-5) (2020).

* Joint research among groups within ISSP.

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Rev. B 101, 140407(R) (2020).
4.

*Sample dependence of half-integer quantized thermal Hall effect in the Kitaev spin-liquid candidate α-RuCl :3

5.

†Ultralow temperature NMR of CeCoIn : M. Yamashita, M. Tashiro, K. Saiki, S. Yamada, M. Akazawa, M. Shimozawa,
5

6.

ヘリウム危機の現状と今後の課題について（解説記事）: 山下 穣 , 固体物理 55, 215-223 (2020).

7.

*Thermal Hall Effects of Spins and Phonons in Kagome Antiferromagnet Cd-Kapellasite: M. Akazawa, M. Shimozawa,

M. Yamashita, J. Gouchi, Y. Uwatoko, N. Kurita and H. Tanaka, Phys. Rev. B 102, 220404(R) (2020).
T. Taniguchi, H. Takeda, M. Takigawa and H. Shishido, Phys. Rev. B 102, 165154 (2020).

S. Kittaka, T. Sakakibara, R. Okuma, Z. Hiroi, H.-Y. Lee, N. Kawashima, J. H. Han and M. Yamashita, Phys. Rev. X 10,041059 (2020).

8.

*Pressure-induced phase transition in the J -J square lattice antiferromagnet RbMoOPO Cl: H. Takeda, T. Yamauchi,
1 2
4

9.

*Strongly correlated superconductivity in a copper-based metal-organic framework with a perfect kagome lattice:

M. Takigawa, H. Ishikawa and Z. Hiroi, Phys. Rev. B 103, 104406 (2021).

T. Takenaka, K. Ishihara, M. Roppongi, Y. Miao, Y. Mizukami, T. Makita, J. Tsurumi, S. Watanabe, J. Takeya,
M. Yamashita, K. Torizuka, Y. Uwatoko, T. Sasaki, X. Huang, W. Xu, D. Zhu, N. Su, J. -G. Cheng, T. Shibauchi and
K. Hashimoto, Sci. Adv. 7, eabf3996(1-8) (2021).

Division of Condensed Matter Theory
Tsunetsugu group
We have studied several topics of strongly correlated systems and nonequilibrium phenomena. Concerning correlated systems,
we have investigated the dynamics of domain wall driven by external magnetic or electric field in multiferroic materials, andfound its dynamical instability to splitting. We have also reexamined phenomenological Ginzburg-Landau theory for CDW
in layered compounds and found new local minima in the free-energy landscape. As for nonequilibrium phenomena, we haveanalyzed various aspects of high-harmonic generation in solids, including the disorder effect, dynamical point-group symmetries, and relativistic dispersion relation of Dirac semimetals. Regarding periodically-driven (Floquet) systems, we haveproposed a new symmetry and derived a general expression for nonequilibrium steady states. In isolated many-body quantum
systems, we have investigated conserved quantities that work as dynamical obstructions and prevent ordinary thermalization.
Related to the two topics, we studied quantum quench dynamics of strongly correlated electrons in one dimension and found a
clogging phenomena where particle current stops but energy current flows.
1.

Generalized hydrodynamic approach to charge and energy currents in the one-dimensional Hubbard model: Y. Nozawa
and H. Tsunetsugu, Phys. Rev. B 101, 035121 (2020).

2.

*Efficient Terahertz Harmonic Generation with Coherent Acceleration of Electrons in the Dirac Semimetal Cd As :3 2

3.

Explicit Construction of Local Conserved Quantities in the XYZ Spin-1/2 Chain: Y. Nozawa and K. Fukai, Phys. Rev.
Lett. 125, 090602 (2020).

4.

Time Crystals Protected by Floquet Dynamical Symmetry in Hubbard Models: K. Chinzei and T. N. Ikeda, Phys. Rev.
Lett. 125, 060601 (2020).

5.

Multivalley Free Energy Landscape and the Origin of Stripe and Quasi-Stripe CDW Structures in Monolayer MX2
Compounds: K. Nakatsugawa, S. Tanda and T. N. Ikeda, Sci. Rep. 10, 1239 (2020).

6.

General description for nonequilibrium steady states in periodically driven dissipative quantum systems: T. N. Ikeda and
M. Sato, Science Advances 6, eabb4019 (2020).

7.

Disorder effects on the origin of high-order harmonic generation in solids: K. Chinzei and T. N. Ikeda, Phys. Rev.
Research 2, 013033 (2020).

8.

High-order nonlinear optical response of a twisted bilayer graphene: T. N. Ikeda, Phys. Rev. Research 2, 032015(R)(2020).

9.

Noncommutative generalized Gibbs ensemble in isolated integrable quantum systems: K. Fukai, Y. Nozawa,K. Kawahara and T. N. Ikeda, Phys. Rev. Research 2, 033403 (2020).

B. Cheng, N. Kanda, T. N. Ikeda, T. Matsuda, P. Xia, T. Schumann, S. Stemmer, J. Itatani, N. P. Armitage and R. Matsunaga, Phys. Rev. Lett. 124, 117402 (2020).

† Joint research with outside partners.

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10. Dynamics of Composite Domain Walls in Multiferroics in Magnetic Field and Their Instability: K. Kawahara and
H. Tsunetsugu, J. Phys. Soc. Jpn. 90, 014703 (2021).
11. Quadrupole Orders on the fcc Lattice: H. Tsunetsugu, T. Ishitobi and K. Hattori, J. Phys. Soc. Jpn. 90, 043701 (2021).
12. Generalized hydrodynamics study of the one-dimensional Hubbard model: Stationary clogging and proportionality ofspin, charge, and energy currents: Y. Nozawa and H. Tsunetsugu, Phys. Rev. B 103, 035130 (2021).

Kato group
The main research subject of Kato Lab. is transport properties in mesoscopic devices. We studied (1) optimization of pumping
power under adiabatic charge driving, (2) microscopic theory for spin Hall magnetoresistance, (3) Cooper-pair transport througha Josephson junction array, and (4) transport properties through a Kondo quantum dot.
1.

Geometrical Optimization of Pumping Power under Adiabatic Parameter Driving: M. Hasegawa and T. Kato, J. Phys.
Soc. Jpn. 89, 064706 (2020).

2.

Fano-Kondo resonance versus Kondo plateau in an Aharonov-Bohm ring with an embedded quantum dot: M. Eto and
R. Sakano, Phys. Rev. B 102, 245402 (2020).

3.

Field-induced SU(4) to SU(2) Kondo crossover in a half-filling nanotube dot: Spectral and finite-temperature properties:
Y. Teratani, R. Sakano, T. Hata, T. Arakawa, M. Ferrier, K. Kobayashi and A. Oguri, Phys. Rev. B 102, 165106 (2020).

4.

Microscopic theory of spin Hall magnetoresistance: T. Kato, Y. Ohnuma and M. Matsuo, Phys. Rev. B 102, 094437(2020).

5.

Fermi Liquid Theory for Nonlinear Transport through a Multilevel Anderson Impurity: Y. Teratani, R. Sakano andA. Oguri, Phys. Rev. Lett. 125, 216801 (2020).

6.

Cooper-Pair Tunneling in Small Josephson Junction Arrays Under Radio-Frequency Irradiation: G. M. Kanyolo,
K. Takeda, Y. Mizugaki, T. Kato and H. Shimada, J. Low Temp. Phys. 201, 269 (2020).

7.

Effects of Tunnel-coupling Asymmetries on Fermi-liquid Transport through an Anderson Impurity: K. Tsutsumi,
Y. Teratani, A. Oguri and R. Sakano, JPS conf. ser. 30, 011174(1-6) (2020).

8.

†*DSQSS: Discrete Space Quantum Systems Solver: Y. Motoyama, K. Yoshimi, A. Masaki-Kato, T. Kato and9.

非平衡状態にある近藤効果（その 2）近藤効果入門 1: 阪野 塁 , 小栗 章 , 固体物理 55, 47-54 (2020).

N. Kawashima, Computer Physics Communications 264, 107944 (2021).

Division of Nanoscale Science
Katsumoto group
We further advanced the study of flying qubits using spin-polarized quantum Hall edge states. In particular, we improved thebeam splitter that splits the electron beam into two channels, and increased the splitting probability from a few percent to 50%,and obtained a beam splitter equivalent to a half mirror in quantum optics. The interferometer using this showed high visibilityof over 70%. In the super-normal-super (SNS) junction, the decrease of the superconducting critical current with the positive
gate voltage has been unexplained. We have found the phenomenon can be interpreted as the decrease of quantum coherence in
the Andreev bound state by the in-plane voltage.
1.

Gate-controlled unitary operation on flying spin qubits in quantum Hall edge states: T. Shimizu, T. Nakamura, Y. Hashimoto, A. Endo and S. Katsumoto, Phys. Rev. B 102, 235302 (2020).

2.

†Optoelectronic properties of laser-beam-patterned few-layer lateral MoS Schottky junctions: Y. Nagamine, J. Sato,23.

*Extracting the Chiral Contribution to the Negative Longitudinal Magnetoresistance in Epitaxial Pr Ir O Thin Films:
2 2 7

4.

†Room-temperature quantum spin Hall phase in laser-patterned few-layer 1T'- MoS : N. Katsuragawa, M. Nishizawa,
2

Y. Qian, T. Inoue, T. Nakamura, S. Maruyama, S. Katsumoto and J. Haruyama, Appl. Phys. Lett. 117, 043101 (2020).

T. Ohtsuki, Z. Tian, A. Endo, M. Halim, S. Katsumoto, Y. Kohama, K. Kindo, M. Lippmaa and S. Nakatsuji, JPS Conf.
Proc. 30, 011181 (1-6) (2020).
T. Nakamura, T. Inoue, S. Pakdel, S. Maruyama, S. Katsumoto, J. J. Palacios and J. Haruyama, Commun Mater 1, 51* Joint research among groups within ISSP.

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(2020).
5.

薄膜材料の電気特性 : 勝本 信吾 , 「2020 年版薄膜作製応用ハンドブック」, 第 2 章 , 權田俊一 , (NTS 出版 , 東京 ,2020), 39-79.

Otani group
This year, we have studied the following topics: spin conversion behaviors in bulk, the interfaces and the surfaces, the magnonphonon or magnon-magnon coupling in ferromagnetic heterostructures, and antiferromagnetic spintronics. I summarize theremarkable achievements this year below. We have established a phenomenological model explaining the contributions ofbulk and interfacial spin relaxation. Our study of transverse magnetoresistance in magnetic heterostructure evidenced the spin
swapping at the Rashba interface. We have experimentally demonstrated the conversion of acoustically induced spin currents tothe charge current using a metal/oxide Rashba interface. This study has also shown significant enhancement of magnon-phonon
coupling using the Brag reflector cavity structure. Besides, our international collaboration showed a large nonlinear ferromagnetic resonance shift due to strong magnon-magnon coupling. We had another collaborative project on skyrmion strings thatclarified their detailed propagation dynamics. This year, there are two exciting breakthroughs; Electrical manipulation of a
topological antiferromagnetic state and Emergent electromagnetic induction in a helical-spin magnet, both of which appeared in
Nature magazine.
1.

Underlayer material dependent symmetric and asymmetric behavior of voltage-controlled magnetic anisotropy in
CoFeB films: B. Rana, K. Miura, H. Takahashi and Y. Otani, J. Phys.: Condens. Matter 32, 414002 (2020).

2.

Electric-field control of interfacial in-plane magnetic anisotropy in CoFeB/MgO junctions: A. Deka, B. Rana, R. Anami,
K. Miura, H. Takahashi, Y. Otani and Y. Fukuma, Phys. Rev. B 101, 174405 (2020).

3.

Large nonlinear ferromagnetic resonance shift and strong magnon-magnon coupling in Ni80Fe20 nanocross array:
K. Adhikari, S. Sahoo, A. K. Mondal, Y. Otani and A. Barman, Phys. Rev. B 101, 054406 (2020).

4.

Phenomenological model for the direct and inverse Edelstein effects: H. Isshiki, P. Muduli, J. Kim, K. Kondou andY. Otani, Phys. Rev. B 102, 184411 (2020).

5.

*Effect of sample size on anomalous Nernst effect in chiral antiferromagnetic Mn Sn devices: H. Narita, T. Higo,
3

6.

Enhancement of acoustic spin pumping by acoustic distributed Bragg reflector cavity: Y. Hwang, J. Puebla, M. Xu,
A. Lagarrigue, K. Kondou and Y. Otani, Appl. Phys. Lett. 116, 252404 (2020).

7.

Evidence for spin swapping from modulation of transverse resistance in magnetic heterostructures with Rashba interface: H. Kim, S. Karube, J. Borge, J. Kim, K. Kondou and Y. Otani, Appl. Phys. Lett. 116, 122403 (2020).

8.

*Magneto-optical Kerr effect in a non-collinear antiferromagnet Mn Ge: M. Wu, H. Isshiki, T. Chen, T. Higo, S. Nakat3

9.

*Electrical manipulation of a topological antiferromagnetic state: H. Tsai, T. Higo, K. Kondou, T. Nomoto, A. Sakai,

M. Ikhlas, S. Nakatsuji and Y. Otani, Appl. Phys. Lett. 116, 072404 (2020).

suji and Y. Otani, Appl. Phys. Lett. 116, 132408 (2020).

A. Kobayashi, T. Nakano, K. Yakushiji, R. Arita, S. Miwa, Y. Otani and S. Nakatsuji, Nature 580, 608-613 (2020).

10. Emergent electromagnetic induction in a helical-spin magnet: T. Yokouchi, F. Kagawa, M. Hirschberger, Y. Otani,
N. Nagaosa and Y. Tokura, Nature 586, 232 (2020).
11. *Chirality-induced effective magnetic field in a phthalocyanine molecule: S. Miwa, K. Kondou, S. Sakamoto,
A. Nihonyanagi, F. Araoka, Y. Otani and D. Miyajima, Appl. Phys. Express 13, 113001 (1-4) (Spotlights 2020) (2020).
12. Acoustic ferromagnetic resonance and spin pumping induced by surface acoustic waves: J. Puebla, M. Xu, B. Rana,
K. Yamamoto, S. Maekawa and Y. Otani, J. Phys. D: Appl. Phys. 53, 264002 (2020).
13. *Structural and magnetic properties of Mn3Ge films with Pt and Ru seed layers: A. Kobayashi, T. Higo, S. Nakatsuji and
Y. Otani, AIP Advances 10, 015225(1-6) (2020).
14. Nonlinear Control of Damping Constant by Electric Field in Ultrathin Ferromagnetic Films: B. Rana, C. A. Akosa,
K. Miura, H. Takahashi, G. Tatara and Y. Otani, Phys. Rev. Applied 14, 014037 (2020).
15. Nonreciprocal surface acoustic wave propagation via magneto-rotation coupling: M. Xu, K. Yamamoto, J. Puebla,
K. Baumgaertl, B. Rana, K. Miura, H. Takahashi, D. Grundler, S. Maekawa and Y. Otani, Sci. Adv. 6, eabb1724 (2020).
16. Voltage controlled on-demand magnonic nanochannels: S. Choudhury, A. K. Chaurasiya, A. K. Mondal, B. Rana,
K. Miura, H. Takahashi, Y. Otani and A. Barman, Sci. Adv. 6, eaba5457 (2020).

† Joint research with outside partners.

ISSP Activity Report 2020161

17. Phase boundary exchange coupling in the mixed magnetic phase regime of a Pd-doped FeRh epilayer: J. R. Massey,
K. Matsumoto, M. Strungaru, R. C. Temple, T. Higo, K. Kondou, R. F. L. Evans, G. Burnell, R. W. Chantrell, Y. Otani
and C. H. Marrows, Phys. Rev. Materials 4, 024403(1-11) (2020).
18. Propagation dynamics of spin excitations along skyrmion strings: S. Seki, M. Garst, J. Waizner, R. Takagi, N. D. Khanh,
Y. Okamura, K. Kondou, F. Kagawa, Y. Otani and Y. Tokura, Nat Commun 11, 256 (2020).
19. *Electrical nucleation, displacement, and detection of antiferromagnetic domain walls in the chiral antiferromagnet
Mn3Sn: S. Sugimoto, Y. Nakatani, Y. Yamane, M. Ikhlas, K. Kondou, M. Kimata, T. Tomita, S. Nakatsuji and Y. Otani,
Commun Phys 3, 111 (2020).
20. Creation of magnetic skyrmions by surface acoustic waves: T. Yokouchi, S. Sugimoto, B. Rana, S. Seki, N. Ogawa,S. Kasai and Y. Otani, Nat. Nanotechnol. 15, 361 (2020).
21. Spintronic devices for energy-efficient data storage and energy harvesting: J. Puebla, J. Kim, K. Kondou and Y. Otani,
Commun Mater 1, 24 (2020).
22. Nontrivial torque generation by orbital angular momentum injection in ferromagnetic-metal/Cu/Al2O3 trilayers: J. Kim,
D. Go, H. Tsai, D. Jo, K. Kondou, H.-W. Lee and Y. Otani, Phys. Rev. B 103, L020407 (2021).
23. *Domain structure and domain wall dynamics in topological chiral antiferromagnets from the viewpoint of magnetic
octupole: Y. Otani and T. Higo, Appl. Phys. Lett. 118, 040501 (2021).
24. *Omnidirectional Control of Large Electrical Output in a Topological Antiferromagnet: T. Higo, Y. Li, K. Kondou,
D. Qu, M. Ikhlas, R. Uesugi, D. Nishio-Hamane, C. L. Chien, Y. Otani and S. Nakatsuji, Adv. Funct. Mater. 31,
2008971-12 (2021).
25. *Spin-orbit torque switching of the antiferromagnetic state in polycrystalline Mn3Sn/Cu/heavy metal heterostructures:
H. Tsai, T. Higo, K. Kondou, A. Kobayashi, T. Nakano, K. Yakushiji, S. Miwa, Y. Otani and S. Nakatsuji, AIP Advances
11, 045110 (1-6) (2021).
26. Strain-induced Megahertz Oscillation and Stable Velocity of an Antiferromagnetic Domain Wall: F. Chen, X. Ge,
W. Luo, R. Xing, S. Liang, X. Yang, L. You, R. Xiong, Y. Otani and Y. Zhang, Phys. Rev. Applied 15, 014030 (2021).
27. *Fabrication of polycrystalline Weyl antiferromagnetic Mn3Sn thin films on various seed layers: T. Nakano, T. Higo,
A. Kobayashi, S. Miwa, S. Nakatsuji and K. Yakushiji, Phys. Rev. Materials 5, 054402 (1-9) (2021).
28. Nanochannels for spin-wave manipulation in Ni80Fe20 nanodot arrays: S. Sahoo, S. N. Panda, S. Barman, Y. Otani and
A. Barman, Journal of Magnetism and Magnetic Materials 522, 167550 (2021).
29. *Giant Effective Damping of Octupole Oscillation in an Antiferromagnetic Weyl Semimetal: S. Miwa, S. Iihama,
T. Nomoto, T. Tomita, T. Higo, M. Ikhlas, S. Sakamoto, Y. Otani, S. Mizukami, R. Arita and S. Nakatsuji, Small Science
1, 2000062 (1-8) (2021).
30. *Large Hall Signal due to Electrical Switching of an Antiferromagnetic Weyl Semimetal State: H. Tsai, T. Higo,
K. Kondou, S. Sakamoto, A. Kobayashi, T. Matsuo, S. Miwa, Y. Otani and S. Nakatsuji, Small Science 1, 2000025 (1-9)(2021).

Komori group
Distribution of local lattice distortion due to the hetero atomic overlayer is investigated using scanning tunnelingmicroscopy(STM) on the Cu(111) surface covered by hexagonal Fe2N atomic layer. We utilize the moiré pattern to reach ahigher spatial resolution than simple STM observations. The distortion can be greatly affected by the formation of atomic
impurities at the subsurface. Ultrathin films of L10-type FeNi are grown using nitrogen-surfactant epitaxy on the Cu(001)substrate. Well-ordered films with little intermixing among Cu, Fe and Ni atoms are realized by optimizing the substratetemperature during the Fe and Ni deposition and the post-annealing temperature. Their ferromagnetic properties are studied bysoft X-ray magnetic circular dichroism. An out-of-plane magnetocrystalline anisotropy is large enough for dominating the film
shape anisotropy. Electronic structure of 3~4-degree twisted bilayer graphene is investigated using angle-resolved photoemission spectroscopy with synchrotron light. The interface between the two graphene sheets of the present samples is made in ahigh vacuum. Owing to the strong interlayer interaction, significant band modifications including replica bands are observedat the energy near the Dirac point and crossing points of the Dirac bands. In particular, partial flat bands appear with changes
in the Dirac velocity, depending on the twist angles. The observed band structure is consistent with the result of tight-binding
calculations.
1.

†*Orbital Angular Momentum Induced Spin Polarization of 2D Metallic Bands: T. Kobayashi, Y. Nakata, K. Yaji,

T. Shishidou, D. Agterberg, S. Yoshizawa, F. Komori, S. Shin, M. Weinert, T. Uchihashi and K. Sakamoto, Phys. Rev.
* Joint research among groups within ISSP.

162

ISSP Activity Report 2020

Lett. 125, 176401, 1-6 (2020).
2.

Sensing surface lattice strain with Kondo resonance of single Co adatom: K. Iwata, T. Miyamachi, E. Minamitani and
F. Komori, Appl. Phys. Lett. 116, 051604, 1-4 (2020).

3.

†Twisted bilayer graphene fabricated by direct bonding in a high vacuum: H. Imamura, A. Visikovskiy, R. Uotani,

4.

*Edge-state correlation accelerates metal-insulator transition in topological semimetal nanofilms: S. Ito, M. Arita,

5.

†*Topological Surface State of Bi Se Modified by Adsorption of Organic Donor Molecule Tetrathianaphthacene:
2 3

6.

Realizing large out-of-plane magnetic anisotropy in L10 FeNi films grown by nitrogen-surfactant epitaxy on Cu(001):
K. Kawaguchi, T. Miyamachi, T. Iimori, Y. Takahashi, T. Hattori, T. Yokoyama, M. Kotsugi and F. Komori, Phys. Rev.
Materials 4, 054403, 1-7 (2020).

7.

*Fully spin-polarized bulk states in ferroelectric GeTe: J. Krempaský, M. Fanciulli, L. Nicolaï, J. Minár, H. Volfová,

8.

Hexagonal iron nitride monolayer on Cu(001): Zigzag-line-in-trough alignment: M. Yamada, K. Ienaga, Y. Takahashi,
T. Miyamachi and F. Komori, Surface Science 700, 121679, 1-9 (2020).

9.

Subatomic Distortion of Surface Monolayer Lattice Visualized by Moiré Pattern: T. Hattori, N. Kawamura, T. Iimori,T. Miyamachi and F. Komori, Nano Lett. 21, 2406-2411 (2021).

T. Kajiwara, H. Ando, T. Iimori, K. Iwata, T. Miyamachi, K. Nakatsuji, K. Mase, T. Shirasawa, F. Komori and
S. Tanaka, Appl. Phys. Express 13, 075004, 1-5 (2020).
J. Haruyama, B. Feng, W. -C. Chen, H. Namatame, M. Taniguchi, C. -M. Cheng, G. Bian, S. -J. Tang, T. -C. Chiang,
O. Sugino, F. Komori and I. Matsuda, Science Advances 6, eaaz5015 (7 pages) (2020).

T. Kitazawa, K. Yaji, K. Shimozawa, H. Kondo, T. Yamanaka, H. Yaguchi, Y. Ishida, K. Kuroda, A. Harasawa,T. Iwahashi, Y. Ouchi, F. Komori, S. Shin and K. Kanai, Adv. Mater. Interfaces 7, 2000524, 1-8 (2020).

O. Caha, V. V. Volobuev, J. Sánchez-Barriga, M. Gmitra, K. Yaji, K. Kuroda, S. Shin, F. Komori, G. Springholz andJ. Hugo Dil, Phys. Rev. Research 2, 013107,1-7 (2020).

10. †*Atomic-layer Rashba-type superconductor protected by dynamic spin-momentum locking: S. Yoshizawa,
T. Kobayashi, Y. Nakata, K. Yaji, K. Yokota, F. Komori, S. Shin, K. Sakamoto and T. Uchihashi, Nat Commun 12, 1462
(2021).
11. †Electronic structure of 3 degree-twisted bilayer graphene on 4H-SiC(0001): T. Iimori, A. Visikovskiy, H. Imamura,T. Miyamachi, M. Kitamura, K. Horiba, H. Kumigashira, K. Mase, K. Nakatsuji, S. Tanaka and F. Komori, Phys. Rev.
Material 5 (2021), in print.

Hasegawa group
We have investigated monolayer superconducting materials using low temperature scanning tunneling microscopy (STM). In
the case of two-dimensional superconductors, it has been known that the superconductivity is directly transformed into insulator
by introducing defects or applying magnetic field. Recent transport measurements on superconducting crystalline thin films,
however, revealed the presence of metallic phases during the super-insulator transitions. In order to elucidate the phenomena
we performed local superconducting gap measurements by STM on atomically-thin well-ordered Pb superconductors under
the perpendicular magnetic field. We observed the metallic phase and found by using vicinal substrates to introduce regularlyarranged steps as scatterers that the critical temperature is reduced but the superconducting gap remains the same. Analyzingthese peculiar microscopic features will provide a new scenario on the super-insulator transition. We are now developing a
new local method to probe spin dynamics of nano-size structures including single atoms/molecules by detecting electron/ferromagnetic resonances based on spin-polarized STM. We have introduced radio-frequency (RF) cables into the STM head andsuccessfully detected response of the RF irradiation in spin-polarized tunneling current. Using spin-polarized STM we havecharacterized magnetic properties of FeCo alloy island structures and found that the magnetoanisotropy can be significantly
reduced by the alloying. We plan to use the alloyed islands as a sample for the resonance detection.
1.

Numerical calculation of the potential distribution on the Si(111)-7 × 7 surface for scanning tunneling potentiometry:
M. Hamada, H.-H. Yang and Y. Hasegawa, Jpn. J. Appl. Phys. 59, SN1016 1-6 (2020).

2.

Si(111)-7×7 表面上の一次元欠陥における電気伝導評価 : 浜田 雅之 , 長谷川 幸雄 , 表面と真空 63, 431-436 (2020).

3.

Enhanced critical magnetic field for monoatomic-layer superconductor by Josephson junction steps: F. Oguro, Y. Sato,
K. Asakawa, M. Haze and Y. Hasegawa, Phys. Rev. B 103, 085416 1-7 (2021).

† Joint research with outside partners.

ISSP Activity Report 2020

163

Lippmaa group
We concluded the project on fabricating iridate pyrochlore thin films by solid-state epitaxy. The behavior of iridium and othernoble metals in the oxide thin film growth process was studied. In particular, the spontaneous phase separation of noble metals
was studied in perovskite and pyrochlore lattices. Several techniques were studied for controlling the sheet carrier density inoxide heterostructures with delta-doping layers. The SrTiO3 / LaTiO3 system was used in these experiments. A new sacrificial
buffer layer process was developed for fabricating strain-free free-standing oxide thin films.
1.

*Growth of Pr Ir O thin films using solid phase epitaxy: T. Ohtsuki, Z. Tian, M. Halim, S. Nakatsuji and M. Lippmaa,
2 2 7

2.

Noble metal clustering and nanopillar formation in an oxide matrix: M. Lippmaa, S. Kawasaki, R. Takahashi andT. Yamamoto, Jpn. J. Appl. Phys. 59, 010501 (1-9) (2020).

3.

Tuning the carrier density in SrTiO3/LaTiO3/SrTiO3 quantum wells: J. N. Lee, X. Hou, R. Takahashi and M. Lippmaa,
Appl. Phys. Lett. 116, 171601 (1-5) (2020).

4.

† 水溶性犠牲層を用いた単結晶薄膜分離技術 : 高橋 竜太 , リップ マーミック , セラミックデータブック 48, 71-75 (2020).

5.

*Extracting the Chiral Contribution to the Negative Longitudinal Magnetoresistance in Epitaxial Pr Ir O Thin Films:
2 2 7

6.

Sacrificial Water-Soluble BaO Layer for Fabricating Free-Standing Piezoelectric Membranes: R. Takahashi and
M. Lippmaa, ACS Appl. Mater. Interfaces 12, 25042-25049 (2020).

7.

Nanopillar composite electrodes for solar-driven water splitting: M. Lippmaa, S. Kawasaki, R. Takahashi andT. Yamamoto, MRS Bulletin 46, 142-151 (2021).

8.

*Observation and control of the weak topological insulator state in ZrTe : P. Zhang, R. Noguchi, K. Kuroda, C. Lin, K.
59.

†Realization of closed-loop optimization of epitaxial titanium nitride thin-film growth via machine learning: I. Ohkubo,
Z. Hou, J. N. Lee, T. Aizawa, M. Lippmaa, T. Chikyow, K. Tsuda and T. Mori, Mater. Today Phys. 16, 100296 (1-6)(2021).

J. Appl. Phys. 127, 035303 (1-9) (2020).

T. Ohtsuki, Z. Tian, A. Endo, M. Halim, S. Katsumoto, Y. Kohama, K. Kindo, M. Lippmaa and S. Nakatsuji, JPS Conf.
Proc. 30, 011181 (1-6) (2020).

Kawaguchi, K. Yaji, A. Harasawa, M. Lippmaa, S. Nie, H. Weng, V. Kandyba, A. Giampietri, A. Barinov, Q. Li, G. D.
Gu, S. Shin and T. Kondo, Nat. Commun. 12, 406 (2021).

Functional Materials Group
Yoshinobu group
We conducted several research projects in the fiscal year 2020: (1) The surface chemistry of hydrogen and formic acid on Cu
step surfaces and Pd-Cu single atom alloy model catalysts studied by SR-PES, IRAS, HREELS and TPD. (2) The adsorption
and desorption of CO2 on Pt(997) studied by TPD and SR-XPS. (3) The adsorption and desorption of CH4 on Pt(997) studied by
IRAS, TPD and SR-XPS. (4) In-situ SR-XPS study of CVD graphene on a Cu surface. (5) AP-XPS study of Pd deposited MoS2
under hydrogen pressure. (6) THz field induced second harmonic light modulation on Pt(111).
1.

*Emergence of nearly flat bands through a kagome lattice embedded in an epitaxial two-dimensional Ge layer with2.

*Formation of BN-covered silicene on ZrB /Si(111) by adsorption of NO and thermal processes: J. Yoshinobu,
2

3.

The roles of step-site and zinc in surface chemistry of formic acid on clean and Zn-modified Cu(111) and Cu(997)
surfaces studied by HR-XPS, TPD, and IRAS: Y. Shiozawa, T. Koitaya, K. Mukai, S. Yoshimoto and J. Yoshinobu,
J. Chem. Phys. 152, 044703 (2020).

4.

*A computational examination of the electric-field-induced proton transfer along the interface hydrogen bond between

5.

†*Atomistic-Level Description of GaN/Water Interface by a Combined Spectroscopic and First-Principles Computa-a bitriangular structure: A. Fleurence, C. -C. Lee, R. Friedlein, Y. Fukaya, S. Yoshimoto, K. Mukai, H. Yamane,
N. Kosugi, J. Yoshinobu, T. Ozaki and Y. Yamada-Takamura, Phys. Rev. B 102, 201102 (2020).

K. Mukai, H. Ueda, S. Yoshimoto, S. Shimizu, T. Koitaya, H. Noritake, C.-C. Lee, T. Ozaki, A. Fleurence, R. Friedlein
and Y. Yamada-Takamura, J. Chem. Phys. 153, 064702 (2020).

proton donating and accepting self-assembled monolayers: Y. Kanematsu, H. S. Kato, S. Yoshimoto, A. Ueda,
S. Yamamoto, H. Mori, J. Yoshinobu, I. Matsuda and M. Tachikawa, Chem. Phys. Lett. 741, 137091 (2020).

* Joint research among groups within ISSP.

164

ISSP Activity Report 2020

tional Approach: M. Sato, Y. Imazeki, T. Takeda, M. Kobayashi, S. Yamamoto, I. Matsuda, J. Yoshinobu, Y. Nakano and
M. Sugiyama, J. Phys. Chem. C 124, 12466 (2020).
6.

C–H Bond Activation of Methane through Electronic Interaction with Pd(110): T. Koitaya, A. Ishikawa, S. Yoshimotoand J. Yoshinobu, J. Phys. Chem. C 125, 1368 (2021).

7.

* 水素を活かすセラミクス

8.

Role of Intermolecular Interactions in the Catalytic Reaction of Formic Acid on Cu(111): A. Shiotari, S. E. M. Putra,
Y. Shiozawa, Y. Hamamoto, K. Inagaki, Y. Morikawa, Y. Sugimoto, J. Yoshinobu and I. Hamada, Small 2021, 2008010(2021).

9.

†*Structure and electronic structure of van der Waals interfaces at a Au(111) surface covered with a well-ordered

プロトンー電子カップル型分子性結晶および二分子膜における機能開拓 : 森 初果 , 加藤 浩之 ,藤野 智子 , 上田 顕 , 吉信 淳 , セラミックス 56, 88-91 (2021).

molecular layer of n-alkanes: H. Mizushima, H. Koike, K. Kuroda, K. Yaji, A. Harasawa, Y. Ishida, M. Nakayama,
K. Mase, K. Mukai, T. Kitazawa, T. Kondo, J. Yoshinobu, S. Shin and K. Kanai, Applied Surface Science 535, 147673(2021).

10. 2020 年版薄膜作製応用ハンドブック(p.883-p.888):（權田俊一監修）第 3 編第 2 章第 7 節「薄膜の表面・界面制御と信頼性」
吉信 淳 , (NTS, Tokyo, Japan, 2020).

Akiyama group
In 2020, which is the last year of our NEDO laser project started in 2018, we made development (fab-less production) andcharacterizations of gain-sitched 1030-1060 nm InGaAs laser diodes (LDs) for short seed-pulse generation below 10 ps, andindeed demonstrated 8 ps pulses generated directly from our developed LDs. We also studied multi-section LDs with strong
nonolinearity for short-pulse generation mechanism analysis. Our study in 2020 on novel solar cells included lead-halide
Perovskite solar cells, space-use multi-junction solar cells, and textured solar cells. Our study on bio- and chemical-physics has
been extended to new luciferin analogs and caged-luciferins.
1.

Accurate modeling of electron-hole binding in CuCl. I. Exciton states: S. V. Nair, J. Usukura and E. Tokunaga, Phys.
Rev. B 102, 075202 (2020).

2.

Accurate modeling of electron-hole binding in CuCl. II. Biexciton wavefunction: J. Usukura, S. V. Nair andE. Tokunaga, Phys. Rev. B 102, 075203 (2020).

3.

In situ wavelength tuning of quantum-dot single-photon sources integrated on a CMOS-processed silicon waveguide:
R. Katsumi, Y. Ota, A. Osada, T. Tajiri, T. Yamaguchi, M. Kakuda, S. Iwamoto, H. Akiyama and Y. Arakawa, Appl.
Phys. Lett. 116, 041103 (2020).

4.

*Quantum-mechanical hydration plays critical role in the stability of firefly oxyluciferin isomers: State-of-the-art calcu-

5.

Exciton Localization and Enhancement of the Exciton–LO Phonon Interaction in a CsPbBr3 Single Crystal: K. Shibata,J. Yan, Y. Hazama, S. Chen and H. Akiyama, J. Phys. Chem. C 124, 18257 (2020).

6.

Theoretical Study of the Wavelength Selection for the Photocleavage of Coumarin-caged D-luciferin: J. Usukura, M.
Hiyama, M. Kurata, Y. Hazama, X. Qiu, F. M. Winnik, H. Akiyama and N. Koga, Photochem Photobiol 96, 805-814(2020).

7.

Quantitative immunohistochemistry using an antibody-fused bioluminescent protein: K.-Y. Wang, C. Wu, S. Shimajiri,
H. Kubota, H. Akiyama and Y. Ohmiya, BioTechnique 64, 302-306 (2020).

8.

High performance single-mode vertical cavity surface emitting lasers based on CsPbBr3 nanocrystals with simplified
processing: C. Zhao, J. Tao, J. Tian, G. Weng, H. Liu, Y. Liu, J. Yan, S. Chen, Y. Pan, X. Hu, S. Chen, H. Akiyama and
J. Chu, Chemical Engineering Journal (online), 127660 (2020).

9.

Lasing operation in the CsPbBr3 perovskite micron hemisphere cavity grown by chemical vapor deposition:
H. Zhang, C. Zhao, S. Chen, J. Tian, J. Yan, G. Weng, X. Hu, J. Tao, Y. Pan, S. Chen, H. Akiyama and J. Chu, Chemical
Engineering Journal 389, 124395 (2020).

lations of the excited states: Y. Noguchi, M. Hiyama, M. Shiga, H. Akiyama and O. Sugino, J. Chem. Phys. 153, 201103(2020).

10. Absolute electroluminescence imaging with distributed circuit modeling: Excellent for solar-cell defect diagnosis:
J. Hong, Y. Wang, Y. Chen, X. Hu, G. Weng, S. Chen, H. Akiyama, Y. Zhang, B. Zhang and J. Chu, Prog Photovolt Res
Appl 28, 295 (2020).

† Joint research with outside partners.

ISSP Activity Report 2020165

11. Modeling and design for low-cost multijunction solar cell via light-trapping rear texture technique: Applied in InGaP/
GaAs/InGaAs triple junction: L. Zhu, Y. Hazama, A. Reddy, K. Watanabe, Y. Nakano, M. Sugiyama and H. Akiyama,
Prog Photovolt Res Appl 28, 251 (2020).
12. Practical target values of Shockley–Read–Hall recombination rates in state-of-the-art triple-junction solar cells forrealizing conversion efficiencies within 1% of the internal radiative limit: T. Nakamura, M. Imaizumi, H. Akiyama andY. Okada, Prog Photovolt Res Appl 28, 417 (2020).
13. Quantitative study of electron tunneling dynamics in asymmetric coupled InGaN/GaN quantum wells: G. Weng, Y. Liu,
S. Chen, T. Ito, X. Hu, C. Zhao, J. Liu, J. Chu and H. Akiyama, Applied Optics 59, 6231-6236 (2020).
14. Importance of Interfacial Passivation in the High Efficiency of Sb2Se3 Thin-Film Solar Cells: Numerical Evidence:
Y. Chen, Y. Wang, R. Wang, X. Hu, J. Tao, G.-E. Weng, C. Zhao, S. Chen, Z. Zhu, J. Chu and H. Akiyama, ACS Appl.
Energy Mater. 11, 10415–10422 (2020).
15. *Direct generation of sub-picosecond pulse via multi-section gain switching: T. Nakamura, T. Ito, H. Nakamae, C. Kim,
Y. Hazama, Y. Kobayashi, R. Kuroda and H. Akiyama, Opt. Lett. 46, 1277 (2021).
16. Fabricating over 7%-efficient Sb2(S,Se)3 thin-film solar cells by vapor transport deposition using Sb2Se3 and Sb2S3
mixed powders as the evaporation source: X. Hu, J. Tao, R. Wang, Y. Wang, Y. Pan, G. Weng, X. Luo, S. Chen, Z. Zhu,
J. Chu and H. Akiyama, Journal of Power Sources 493, 229737 (2021).
17. Superior single-mode lasing in a self-assembly CsPbX3 microcavity over an ultrawide pumping wavelength range:
G. Weng, J. Yan, S. Chen, C. Zhao, H. Zhang, J. Tian, Y. Liu, X. Hu, J. Tao, S. Chen, Z. Zhu, H. Akiyama and J. Chu,
Photon. Res. 9, 54 (2021).
18. Electron–Hole Plasma Lasing Dynamics in CsPbClmBr3-m Microplate Lasers: G. Weng, J. Tian, S. Chen, J. Yan,
H. Zhang, Y. Liu, C. Zhao, X. Hu, X. Luo, J. Tao, S. Chen, Z. Zhu, J. Chu and H. Akiyama, ACS Photonics 8, 787(2021).
19. Adaptive automatic solar cell defect detection and classification based on absolute electroluminescence imaging:
Y. Wang, L. Li, Y. Sun, J. Xu, Y. Jia, J. Hong, X. Hu, G. Weng, X. Luo, S. Chen, Z. Zhu, J. Chu and H. Akiyama, Energy
229, 120606 (2021).
20. Enhanced Magneto-Optical Kerr Effect of GaAs-Based P-N Junctions in the Terahertz Range: K. Miyagawa, M. Nagai,
M. Ashida, C. Kim and H. Akiyama, J Infrared Milli Terahz Waves 42, 325 (2021).

Sugino group
We have studied the density functional theory for molecules and condensed matters either in the ground state or in the excitedstates. We have also studies energy-materials such as lithium-ion battery, solid-state battery and fuel-cell and bio-materials suchas oxyluciferin of firefly. We have also contributed to get theoretical interpretation of experiments. All are based on the firstprinciples calculations.
1.

Hydrogen at Electrochemical Interfaces: O. Sugino, J. Phys. Soc. Jpn. 89, 051013 (2020).

2.

†Nuclear quantum effect for hydrogen adsorption on Pt(111): L. Yan, Y. Yamamoto, M. Shiga and O. Sugino, Phys. Rev.

3.

*Quantum-mechanical hydration plays critical role in the stability of firefly oxyluciferin isomers: State-of-the-art calcu-

4.

†Machine learning exchange-correlation potential in time-dependent density-functional theory: Y. Suzuki, R. Nagai and

5.

†Structural Variation in Carbonate Electrolytes by the Addition of Li Salts Studied by X-Ray Total Scattering:

6.

†Dopant arrangements in Y-doped BaZrO under processing conditions and their impact on proton conduction: a large3

7.

*Edge-state correlation accelerates metal-insulator transition in topological semimetal nanofilms: S. Ito, M. Arita,

B 101, 165414 (2020).

lations of the excited states: Y. Noguchi, M. Hiyama, M. Shiga, H. Akiyama and O. Sugino, J. Chem. Phys. 153, 201103(2020).
J. Haruyama, Phys. Rev. A 101, 050501 (2020).

K. Kimura, K. Hayashi, H. Kiuchi, M. Morita, J. Haruyama, M. Otani, H. Sakaebe, F. Fujisaki, K. Mori, M. Yonemura,Y. Takabayashi, T. Nakatani, S. Fujinami, T. Fukunaga and E. Matsubara, Phys. Status Solidi B 257, 2000100 (2020).
scale first-principles thermodynamics study: S. Kasamatsu, O. Sugino, T. Ogawa and A. Kuwabara, J. Mater. Chem.
A 8, 12674 (2020).
J. Haruyama, B. Feng, W. -C. Chen, H. Namatame, M. Taniguchi, C. -M. Cheng, G. Bian, S. -J. Tang, T. -C. Chiang,* Joint research among groups within ISSP.

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O. Sugino, F. Komori and I. Matsuda, Science Advances 6, eaaz5015 (7 pages) (2020).
8.

†Surface-state Coulomb repulsion accelerates a metal-insulator transition in topological semimetal nanofilms: S. Ito,9.

†Challenge of advanced low temperature fuel cells based on high degree of freedom of group 4 and 5 metal oxides:

M. Arita, J. Haruyama, B. Feng, W. -C. Chen, H. Namatame, M. Taniguchi, C. -M. Cheng, G. Bian, S. -J. Tang, T. -C.
Chiang, O. Sugino, F. Komori and I. Matsuda, Sci. Adv. 6, eaaz5015 (2020).

A. Ishihara, S. Tominaka, S. Mitsushima, H. Imai, O. Sugino and K.-I. Ota, Current Opinion in Electrochemistry 21,
234 (2020).

10. †Completing density functional theory by machine learning hidden messages from molecules: R. Nagai, R. Akashi and
O. Sugino, npj Comput Mater 6, 43 (2020).
11. †Comparative Study on Sulfide and Oxide Electrolyte Interfaces with Cathodes in All-Solid-State Battery via FirstPrinciples Calculations: Y. Okuno, J. Haruyama and Y. Tateyama, ACS Appl. Energy Mater. 3, 11061 (2020).
12. †First-Principles Calculation of Copper Oxide Superconductors That Supports the Kamimura-Suwa Model:
H. Kamimura, M. Araidai, K. Ishida, S. Matsuno, H. Sakata, K. Shiraishi, O. Sugino and J.-S. Tsai, Condensed Matter 5,
69 (2020).
13. †Ab initio construction of the energy density functional for electron systems with the functional-renormalization-groupaided density functional theory: T. Yokota and T. Naito, Phys. Rev. Research 3, L012015 (2021).
14. †Advances and challenges for experiment and theory for multi-electron multi-proton transfer at electrified solid-liquidinterfaces: K. Sakaushi, T. Komeda, S. Hammes-Schiffer, M. M. Melander and O. Sugino, Phys. Chem. Chem. Phys.
22, 19401-19442 (2021).

Oka group
The Oka group has constructed the theory for detecting Majorana modes in Kitaev's chiral spin liquid using STM setups. In
addition, we have done a collaboration with experimentalists on novel transport properties in layered metals, as well as an Highharmonics generation measurement in 3D Dirac materials.
1.

h/e oscillations in interlayer transport of delafossites: C. Putzke, M. D. Bachmann, P. McGuinness, E. Zhakina,
V. Sunko, M. Konczykowski, T. Oka, R. Moessner, A. Stern, M. König, S. Khim, A. P. Mackenzie and P. J. W. Moll,
Science 368, 1234 (2020).

2.

Non-perturbative terahertz high-harmonic generation in the three-dimensional Dirac semimetal Cd3As2: S. Kovalev, R.
M. Dantas, S. Germanskiy, J.-C. Deinert, B. Green, I. Ilyakov, N. Awari, M. Chen, M. Bawatna, J. Ling, F. Xiu, P. H.
van Loosdrecht, P. Surówka, T. Oka and Z. Wang, Nature communications 11, 1-6 (2020).

3.

Scanning Tunneling Microscopy as a Single Majorana Detector of Kitaev’s Chiral Spin Liquid: M. Udagawa, S. Takayoshi and T. Oka, Phys. Rev. Lett. 126, 127201 (2021).

Inoue group
In 2020, we revealed a new family of light-driven inward H+ pumping rhodopsin, schizorhodopsin (SzR), from Asgard archaea
and marine micro-organisms. The mechanism of SzR was investigated by laser flash photolysis and FTIR spectroscopy. As theresult, it was revealed that the H+ of the retinal is released to the cytoplasmic milieu without being trapped at any amino acidresidues in the protein. This is considerably different from that another inward H+ pumping rhodopsin, xenorhodopsin. Also,
we reported the role of a conserved tryptophan (Trp163) in the gating the mechanism of channelrhodopsin (C1C2). While themutation of this residue (C1C2 W163F) reduced the channel activity, the H+ pump activity was manifested.
1.

Excitonic Coupling Effect on the Circular Dichroism Spectrum of Sodium-Pumping Rhodopsin KR2: K. J. Fujimotoand K. Inoue, J. Chem. Phys. 153, 045101 (2020).

2.

Allosteric Communication to the Retinal Chromophore upon Ion Binding in a Light-driven Sodium Ion Pumping
Rhodopsin: A. Otomo, M. Mizuno, K. Inoue, H. Kandori and Y. Mizutani, Biochemistry 59, 520-529 (2020).

3.

Schizorhodopsins: A Novel Family of Rhodopsins from Asgard archaea that Function as Light-Driven Inward H+
Pumps: K. Inoue, S. P. Tsunoda, M. Singh, S. Tomida, S. Hososhima, M. Konno, R. Nakamura, H. Watanabe, P. -A.
Bulzu, H. L. Banciu, A. -S. Andrei, T. Uchihashi, R. Ghai, O. Béjà and H. Kandori, Sci. Adv. 6, eaaz2441 (2020).

4.

Infrared spectroscopic analysis on structural changes around the protonated Schiff base upon retinal isomerizationin light-driven sodium pump KR2: S. Tomida, S. Ito, T. Mato, Y. Furutani, K. Inoue and H. Kandori, Biochimica et† Joint research with outside partners.

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Biophysica Acta (BBA) - Bioenergetics 1861, 148190 (2020).
5.

Physical disuse contributes to widespread chronic mechanical hyperalgesia, tactile allodynia, and cold allodynia throughneurogenic inflammation and spino-parabrachio-amygdaloid pathway activation: Y. Ohmichi, M. Ohmichi, R. Tashima,
K. Osuka, K. Fukushige, D. Kanikowska, Y. Fukazawa, H. Yawo, M. Tsuda, M. Naito and T. Nakano, PAIN 161,
1808-1823 (2020).

6.

Gate-keeper of ion transport – a highly conserved helix-3 tryptophan in a channelrhodopsin chimera, C1C2/ChRWR:
Y. Nagasaka, S. Hososhima, N. Kubo, T. Nagata, H. Kandori, K. Inoue and H. Yawo, Biophys. Physicobiol. 17, 59-69(2020).

7.

Active Learning for Level Set Estimation under Input Uncertainty and Its Extensions: Y. Inatsu, M. Karasuyama,
K. Inoue and I. Takeuchi, Neural Computation 32, 2486-2531 (2020).

8.

Active Learning of Bayesian Linear Models with High-Dimensional Binary Features by Parameter Confidence-Region
Estimation: Y. Inatsu, M. Karasuyama, K. Inoue, H. Kandori and I. Takeuchi, Neural Computation 32, 1998-2031(2020).

9.

Crystal structure of schizorhodopsin reveals mechanism of inward proton pumping: A. Higuchi, W. Shihoya, M. Konno,
T. Ikuta, H. Kandori, K. Inoue and O. Nureki, Proc. Natl. Acad. Sci. USA 118, e2016328118 (2021).

10. Exploration of natural red-shifted rhodopsins using a machine learning-based Bayesian experimental design: K. Inoue,
M. Karasuyama, R. Nakamura, M. Konno, D. Yamada, K. Mannen, T. Nagata, Y. Inatsu, H. Yawo, K. Yura, O. Béjà,
H. Kandori and I. Takeuchi, Commun. Biol. 4, 362 (2021).
11. TAT Rhodopsin Is an Ultraviolet-Dependent Environmental pH Sensor: C. Kataoka, T. Sugimoto, S. Shigemura,
K. Katayama, S. P. Tsunoda, K. Inoue, O. Béjà and H. Kandori, Biochemistry, acs.biochem.0c00951 (2021), in print.
12. 光で細胞を制御する―多様な微生物型ロドプシンとオプトジェネティクス―: 井上 圭一 , 光学 49, 2-7 (2020).
13. Shining light on rhodopsin selectivity: How do proteins decide whether to transport H+ or Cl–?: K. Inoue, J. Biol. Chem.
295, 14805-14806 (2020).
14. 光駆動タンパク質ロドプシンの分子機能エンジニアリング : 井上 圭一 , 生物工学会誌 98, 664-668 (2020).
15. ラットを用いたオプトジェネティクス（光遺伝学）: 八尾 寛 , 深澤 有吾 , 冨田 浩史 , 五十嵐 敬幸 , 日本実験動物協会情報
誌 LABIO 21 80, 5-8 (2020).
16. A series of commentaries for a symposium entitled “Session 3SDA - Optogenetics: applying photoreceptor for understanding biological phenomena”: S. P. Tsunoda and K. Inoue, Biophys Rev 12, 295 (2020).
17. Expanding horizons of biosciences by light-control: M. Kataoka and T. Nagata, Biophysics and Physicobiology (2021),
accepted for publication.
18. Application of Optogenetics for Muscle Cells and Stem Cells: T. Asano, D. B. L. Teh and H. Yawo, in: Optogenetics,
edited by Hiromu Yawo, Hideki Kandori, Amane Koizumi, Ryoichiro Kageyama, (Springer Nature, 2021), 359-375.
19. Diversity, Mechanism, and Optogenetic Application of Light-Driven Ion Pump Rhodopsins: K. Inoue, in: Optogenetics,
edited by Hiromu Yawo, Hideki Kandori, Amane Koizumi, Ryoichiro Kageyama, (Springer Nature, 2021), 89-126.
20. ロドプシンが拓くタンパク質科学の地平 : 井上 圭一 ,「未来探究２０５０ 東大 30 人の知性が読み解く世界」, 東京大学未来ビジョン研究センター , ( 日本経済新聞出版 , 2021), 74-83.

Quantum Materials Group
Oshikawa group
We conducted theoretical studies on a wide range of subjects in quantum many-body problem. In particular, we proposed anovel mechanism of producing robust flat band in a network of conducting segments. In particular, in a honeycomb network,
the flat band is stable as long as the hopping range is shorter than the segment length and the reflection symmetry of the honeycomb structure is kept. This may be realized in the nearly-commensurate charge density wave (NCCDW) phase of 1T-TaS2,
and could be a factor for the superconductivity observed at low temperatures in the vicinity of the NCCDW phase. We also
introduced a new argument based on tilted boundary conditions for the Lieb-Schultz-Mattis (LSM) ingappability. It removes theneed of an artificial restriction on system sizes, and elucidates the relation between the LSM ingappability in higher dimensions* Joint research among groups within ISSP.

168

ISSP Activity Report 2020and the anomaly in quantum field theory in 1+1 dimensions.
1.

†*Particle-Hole Symmetry Breaking in a Spin-Dimer System TlCuCl Observed at 100 T: X. -G. Zhou, Y. Yao, Y. H.
3

2.

†Stable Flatbands, Topology, and Superconductivity of Magic Honeycomb Networks: J. M. Lee, C. Geng, J. W. Park, M.

3.

Generalized Boundary Condition Applied to Lieb-Schultz-Mattis-Type Ingappabilities and Many-Body Chern Numbers:
Y. Yao and M. Oshikawa, Phys. Rev. X 10, 031008 (2020).

4.

†Refined symmetry indicators for topological superconductors in all space groups: S. Ono, H. C. Po and H. Watanabe,

5.

†Filling-enforced constraint on the quantized Hall conductivity on a periodic lattice: Y.-M. Lu, Y. Ran and M. Oshikawa,

6.

†Proof of the Absence of Long-Range Temporal Orders in Gibbs States: H. Watanabe, M. Oshikawa and T. Koma, J Stat
Phys 178, 926 (2020).

7.

Non-local order parameters and quantum entanglement for fermionic topological field theories: K. Inamura,
R. Kobayashi and S. Ryu, Journal of High Energy Physics 01, 121(1-30) (2020).

8.

Cyclotron resonance in Kondo insulator: Y. Tada, Physical Review Research 2, 023194 (2020).

9.

Quantum criticality of magnetic catalysis in two-dimensional correlated Dirac fermions: Y. Tada, Physical Review
Research 2, 033363 (2020).

Matsuda, A. Ikeda, A. Matsuo, K. Kindo and H. Tanaka, Phys. Rev. Lett. 125, 267207 1-6 (2020).
Oshikawa, S.-S. Lee, H. W. Yeom and G. Y. Cho, Phys. Rev. Lett. 124, 137002 (2020).

Sci. Adv. 6, eaaz8367 (1-14) (2020).

Annals of Physics 413, 168060 (2020).

10. Quantum valence bond ice theory for proton-driven quantum spin-dipole liquids: M. G. Yamada and Y. Tada, PhysicalReview Research 2, 043077 (2020).
11. †Higher anomalies, higher symmetries, and cobordisms II: Lorentz symmetry extension and enriched bosonic / fermionic quantum gauge theory: Z. Wan, J. Wang and Y. Zheng, Annals of Mathematical Sciences and Applications 5, 171(2020).
12. †Non-Fermi Liquids in Conducting Two-Dimensional Networks: J. M. Lee, M. Oshikawa and G. Y. Cho, Phys. Rev.
Lett. 126, 186601 (2021).
13. †Parafermionization, bosonization, and critical parafermionic theories: Y. Yao and A. Furusaki, J. High Energ. Phys.
2021, 285 (2021).
14. †Twisted boundary condition and Lieb-Schultz-Mattis ingappability for discrete symmetries: Y. Yao and M. Oshikawa,Phys. Rev. Lett. (2021), accepted for publication.

Nakatsuji group
A new era in quantum materials research arises, featuring discoveries of novel topological phases of matter and emergent quasiparticle excitations behaving as elusive elementary particles. Our research activities focus on designing and synthesizing newmaterials with emergent quantum properties that have never been seen before, then exploring the physics behind such properties with our world-leading measurement facilities. We aim to lead the innovative quest for new quantum materials that bear a
far-reaching impact not only on basic science but also on our everyday life in the future. Major research themes: 1. Solid-stateanalogs of relativistic particles and new quantum phenomena · Weyl fermion and chiral anomaly · Quantum spin ice, magnetic
monopole, and emergent photon 2. Room-temperature quantum transport phenomena in topological magnetic materials · Weyl
antiferromagnets and their application to spintronic devices · Giant thermal and optical responses driven by the Berry curvature
3. Quantum phase transition in strongly correlated systems · Non-Fermi-liquid behavior and exotic superconductivity in multipolar Kondo materials
1.

*Field-Orientation Effect on Ferro-Quadrupole Order in PrTi Al : S. Kittaka, T. Taniguchi, K. Hattori, S. Nakamura,
2 20

2.

Unveiling Quadrupolar Kondo Effect in the Heavy Fermion Superconductor PrV2Al20: M. Fu, A. Sakai, N. Sogabe,
M. Tsujimoto, Y. Matsumoto and S. Nakatsuji, J. Phys. Soc. Jpn. 89, 013704 (2020).

3.

*Growth of Pr Ir O thin films using solid phase epitaxy: T. Ohtsuki, Z. Tian, M. Halim, S. Nakatsuji and M. Lippmaa,
2 2 7

T. Sakakibara, M. Takigawa, M. Tsujimoto, A. Sakai, Y. Matsumoto and S. Nakatsuji, J. Phys. Soc. Jpn. 89, 043701(1-4)(2020).

J. Appl. Phys. 127, 035303 (1-9) (2020).

† Joint research with outside partners.

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4.

Anomalous transverse response of Co2MnGa and universality of the room-temperature ratio αijA/σijA across topologic
al magnets: L. Xu, X. Li, L. Ding, T. Chen, A. Sakai, B. Fauqué, S. Nakatsuji, Z. Zhu and K. Behnia, Phys. Rev. B 101,
180404 (2020).

5.

Antichiral spin order, its soft modes, and their hybridization with phonons in the topological semimetal Mn3Ge:
Y. Chen, J. Gaudet, S. Dasgupta, G. G. Marcus, J. Lin, T. Chen, T. Tomita, M. Ikhlas, Y. Zhao, W. C. Chen, M. B. Stone,
O. Tchernyshyov, S. Nakatsuji and C. Broholm, Phys. Rev. B 102, 054403 (2020).

6.

Strong in-plane anisotropy in the electronic structure of fixed-valence β-LuAlB4: P. Reiss, J. Baglo, H. Tan, X. Chen,
S. Friedemann, K. Kuga, F. Malte Grosche, S. Nakatsuji and M. Sutherland, Phys. Rev. B 102, 081102 (2020).

7.

Impact of the lattice on magnetic properties and possible spin nematicity in the S = 1 triangular antiferromagnet
NiGa2S4: M. E. Valentine, T. Higo, Y. Nambu, D. Chaudhuri, J. Wen, C. Broholm, S. Nakatsuji and N. Drichko, Phys.
Rev. Lett. 125, 197201 (2020).

8.

Many-Body Resonance in a Correlated Topological Kagome Antiferromagnet: SS. Zhang, JX. Yin, M. Ikhlas, HJ. Tien,
R. Wang, N. Shumiya, GQ. Chang, SS. Tsirkin, YG. Shi, CJ. Yi, Z. Guguchia, H. Li, WH. Wang, TR. Chang, ZQ. Wang,
YF. Yang, T. Neupert, S. Nakatsuji and MZ. Hasan, Phys. Rev. Lett. 125, 046401 (2020).

9.

A tunable stress dilatometer and measurement of the thermal expansion under uniaxial stress of Mn3Sn: M. Ikhlas, K. R.
Shirer, P.-Y. Yang, A. P. Mackenzie, S. Nakatsuji and C. W. Hicks, Appl. Phys. Lett. 117, 233502 (2020).

10. *Effect of sample size on anomalous Nernst effect in chiral antiferromagnetic Mn3Sn devices: H. Narita, T. Higo,
M. Ikhlas, S. Nakatsuji and Y. Otani, Appl. Phys. Lett. 116, 072404 (2020).
11. *Magneto-optical Kerr effect in a non-collinear antiferromagnet Mn3Ge: M. Wu, H. Isshiki, T. Chen, T. Higo, S. Nakatsuji and Y. Otani, Appl. Phys. Lett. 116, 132408 (2020).
12. Superconducting properties of the ternary boride YRh4B4: J. Jatmika, H. Maruyama, M. S. Rahman, A. Sakai, S. Nakatsuji, A. Iyo and T. Ebihara, Supercond. Sci. Technol. 33, 125006 (2020).
13. *Electrical manipulation of a topological antiferromagnetic state: H. Tsai, T. Higo, K. Kondou, T. Nomoto, A. Sakai,
A. Kobayashi, T. Nakano, K. Yakushiji, R. Arita, S. Miwa, Y. Otani and S. Nakatsuji, Nature 580, 608-613 (2020).
14. *Iron-based binary ferromagnets for transverse thermoelectric conversion: A. Sakai, S. Minami, T. Koretsune, T. Chen,
T. Higo, Y. Wang, T. Nomoto, M. Hirayama, S. Miwa, D. Nishio-Hamane, F. Ishii, R. Arita and S. Nakatsuji, Nature
581, 53-57 (2020).
15. 硬 X 線光電子分光と基礎物性測定により明らかにした価数の量子臨界現象 : 久我 健太郎 , 松本 洋介 , 大川 万里生 , 中
辻 知 , 放射光 33, 1-8 (2020).
16. Magnetic and transport properties of amorphous, B2 and L21 Co2MnGa thin films: Z. Zhu, T. Higo, S. Nakatsuji and
Y. Otani, AIP Advances 10, 085020 (2020).
17. *Structural and magnetic properties of Mn3Ge films with Pt and Ru seed layers: A. Kobayashi, T. Higo, S. Nakatsuji and
Y. Otani, AIP Advances 10, 015225(1-6) (2020).
18. *Extracting the Chiral Contribution to the Negative Longitudinal Magnetoresistance in Epitaxial Pr2Ir2O7 Thin Films:
T. Ohtsuki, Z. Tian, A. Endo, M. Halim, S. Katsumoto, Y. Kohama, K. Kindo, M. Lippmaa and S. Nakatsuji, JPS Conf.
Proc. 30, 011181 (1-6) (2020).
19. *Magnetization and Thermal Expansion Properties of Quantum Spin Ice Candidate Pr2Zr2O7: N. Tang, A. Sakai,
K. Kimura, S. Nakamura, M. Fu, Y. Matsumoto, T. Sakakibara and S. Nakatsuji, JPS Conf. Proc. 30, 011090(1-6)(2020).
20. Large Nernst Effect and Thermodynamics Properties in Weyl Antiferromagnet: T. Tomita, M. Ikhlas and S. Nakatsuji,
JPS Conf. Proc 30, 011009/1-7 (2020).
21. *Room-temperature terahertz anomalous Hall effect in Weyl antiferromagnet Mn3Sn thin films: T. Matsuda, N. Kanda,
T. Higo, N. P. Armitage, S. Nakatsuji and R. Matsunaga, Nat Commun 11, 909 (2020).
22. *Electrical nucleation, displacement, and detection of antiferromagnetic domain walls in the chiral antiferromagnet
Mn3Sn: S. Sugimoto, Y. Nakatani, Y. Yamane, M. Ikhlas, K. Kondou, M. Kimata, T. Tomita, S. Nakatsuji and Y. Otani,
Commun Phys 3, 111 (2020).
23. Sample Quality Dependence of the Magnetic Properties in Non-Collinear Antiferromagnet Mn 3Sn: M. Ikhlas,
T. Tomita and S. Nakatsuji, JPS. Conf. Proc 30, 011177 (2020).

* Joint research among groups within ISSP.

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24. Crystal structure and magnetic properties of the ferromagnet CoMnSb: H. Nakamura, M. Y. P. Akbar, T. Tomita, A. A.
Nugroho and S. Nakatsuji, JPS Conference Proceedings 29, 013004/1-5 (2020).
25. Unconventional free charge in the correlated semimetal Nd2Ir2O7: K. Wang, B. Xu, C. W. Rischau, N. Bachar,
B. Michon, J. Teyssier, Y. Qiu, T. Ohtsuki, B. Cheng, N. P. Armitage, S. Nakatsuji and D. van der Marel, Nat. Phys. 16,
1194–1198 (2020).
26. Superconducting properties of the ternary boride YRh4B4: J. Jatmika, H. Maruyama, MS. Rahman, A. Sakai, S. Nakatsuji, A. Iyo and T. Ebihara, SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 33, 125006 (2020).
27. *Low Gilbert damping in the nodal-line semimetal D03-Fe3Ga epitaxial thin film: S. Sakamoto, T. Higo, S. Tamaru,
H. Kubota, K. Yakushiji, S. Nakatsuji and S. Miwa, Phys. Rev. B 103, 165122 (1-5) (2021).
28. *Domain structure and domain wall dynamics in topological chiral antiferromagnets from the viewpoint of magnetic
octupole: Y. Otani and T. Higo, Appl. Phys. Lett. 118, 040501 (2021).
29. *Omnidirectional Control of Large Electrical Output in a Topological Antiferromagnet: T. Higo, Y. Li, K. Kondou,
D. Qu, M. Ikhlas, R. Uesugi, D. Nishio-Hamane, C. L. Chien, Y. Otani and S. Nakatsuji, Adv. Funct. Mater. 31,
2008971-12 (2021).
30. *Spin-orbit torque switching of the antiferromagnetic state in polycrystalline Mn3Sn/Cu/heavy metal heterostructures:
H. Tsai, T. Higo, K. Kondou, A. Kobayashi, T. Nakano, K. Yakushiji, S. Miwa, Y. Otani and S. Nakatsuji, AIP Advances
11, 045110 (1-6) (2021).
31. Anomalous transport due to Weyl fermions in the chiral antiferromagnets Mn3X, X=Sn, Ge: T. Chen, T. Tomita,
S. Minami, M. Fu, T. Koretsune, M. Kitatani, I. Muhammad, D. Nishio-Hamane, R. Ishii, F. Ishii, R. Arita and S. Nakatsuji, Nat. Commun. 12, 572 (2021).
32. Inhomogeneous Kondo-lattice in geometrically frustrated Pr2Ir2O7: M. Kavai, J. Friedman, K. Sherman, M. Gong,
I. Giannakis, S. Hajinazar, H. Hu, S. E. Grefe, J. Leshen, Q. Yang, S. Nakatsuji, A. N. Kolmogorov, Q. Si, M. Lawler
and P. Aynajian, Nat. Commun. 12, 1377 (2021).
33. *Fabrication of polycrystalline Weyl antiferromagnetic Mn3Sn thin films on various seed layers: T. Nakano, T. Higo,
A. Kobayashi, S. Miwa, S. Nakatsuji and K. Yakushiji, Phys. Rev. Materials 5, 054402 (1-9) (2021).
34. *Giant Effective Damping of Octupole Oscillation in an Antiferromagnetic Weyl Semimetal: S. Miwa, S. Iihama,
T. Nomoto, T. Tomita, T. Higo, M. Ikhlas, S. Sakamoto, Y. Otani, S. Mizukami, R. Arita and S. Nakatsuji, Small Science
1, 2000062 (1-8) (2021).
35. *Large Hall Signal due to Electrical Switching of an Antiferromagnetic Weyl Semimetal State: H. Tsai, T. Higo,
K. Kondou, S. Sakamoto, A. Kobayashi, T. Matsuo, S. Miwa, Y. Otani and S. Nakatsuji, Small Science 1, 2000025 (1-9)(2021).

Miwa group
We have studied the following topics this year: (1) Spin-torque effect on a chiral antiferromagnet Mn3Sn, (2) Thin film growthof a line-node ferromagnet Fe3X, and (3) Chiral molecular spintronics device. In topic (1), we find that it is feasible to control
a topological antiferromagnetic state in Mn3Sn by using an unconventional spin-transfer effect (Nature 580, 608). This is awork in collaboration with Nakatsuji and Otani groups. In topic (2), we have succeeded in preparing Fe3Al and Fe3Gd thin filmby using a molecular beam epitaxy method, which shows giant anomalous Nernst effect as those in a bulk form (Nature 581,
53). This is a work in collaboration with Nakatsuji group. In topic (3), we find a chirality-induced effective magnetic field in aphthalocyanine molecule at Fe/MgO interface. Unlike the previous study, our system shows an effective magnetic field in theabsence of a bias current in the system (Appl. Phys. Express 13, 113001, Spotlights 2020).
1.

Voltage-controlled magnetic anisotropy in an ultrathin nickel film studied by operando x-ray magnetic circulardichroism spectroscopy: R. Miyakaze, S. Sakamoto, T. Kawabe, T. Tsukahara, Y. Kotani, K. Toyoki, T. Nakamura,
M. Goto, Y. Suzuki and S. Miwa, Phys. Rev. B 102, 014419 (1-6) (2020).

2.

Investigation of gating effect in Si spin MOSFET: S. Lee, F. Rortais, R. Ohshima, Y. Ando, M. Goto, S. Miwa,
Y. Suzuki, H. Koike and M. Shiraishi, Appl. Phys. Lett. 116, 022403 (1-5) (2020).

3.

Sizable spin-transfer torque in the Bi/Ni80Fe20 bilayer film: M. Matsushima, S. Miwa, S. Sakamoto, T. Shinjo,
R. Ohshima, Y. Ando, Y. Fuseya and M. Shiraishi, Appl. Phys. Lett. 117, 042407 (1-4) (2020).

4.

*Electrical manipulation of a topological antiferromagnetic state: H. Tsai, T. Higo, K. Kondou, T. Nomoto, A. Sakai,

A. Kobayashi, T. Nakano, K. Yakushiji, R. Arita, S. Miwa, Y. Otani and S. Nakatsuji, Nature 580, 608-613 (2020).
† Joint research with outside partners.

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5.

*Iron-based binary ferromagnets for transverse thermoelectric conversion: A. Sakai, S. Minami, T. Koretsune, T. Chen,

T. Higo, Y. Wang, T. Nomoto, M. Hirayama, S. Miwa, D. Nishio-Hamane, F. Ishii, R. Arita and S. Nakatsuji, Nature
581, 53-57 (2020).

6.

Control of Spin–Orbit Torques by Interface Engineering in Topological Insulator Heterostructures: F. Bonell, M. Goto,
G. Sauthier, J. F. Sierra, A. I. Figueroa, M. V. Costache, S. Miwa, Y. Suzuki and S. O. Valenzuela, Nano Lett. 20,
5893-5899 (2020).

7.

Detection of Spin Transfer from Metal to Molecule by Magnetoresistance Measurement: H. Gamou, K. Shimose,
R. Enoki, E. Minamitani, A. Shiotari, Y. Kotani, K. Toyoki, T. Nakamura, Y. Sugimoto, M. Kohda, J. Nitta and S. Miwa,
Nano Lett. 20, 75-80 (2020).

8.

*Chirality-induced effective magnetic field in a phthalocyanine molecule: S. Miwa, K. Kondou, S. Sakamoto,

9.

Over 1% magnetoresistance ratio at room temperature in non-degenerate silicon-based lateral spin valves: H. Koike,
S. Lee, R. Ohshima, E. Shigematsu, M. Goto, S. Miwa, Y. Suzuki, T. Sasaki, Y. Ando and M. Shiraishi, Appl. Phys.
Express 13, 083002 (1-4) (2020).

A. Nihonyanagi, F. Araoka, Y. Otani and D. Miyajima, Appl. Phys. Express 13, 113001 (1-4) (Spotlights 2020) (2020).

10. Enhancement of spin signals by thermal annealing in silicon-based lateral spin valves: N. Yamashita, S. Lee,
R. Ohshima, E. Shigematsu, H. Koike, Y. Suzuki, S. Miwa, M. Goto, Y. Ando and M. Shiraishi, AIP Advances 10,095021 (1-6) (2020).
11. Electrical Control for Extending the Ramsey Spin Coherence Time of Ion-Implanted Nitrogen-Vacancy Centers inDiamond: S. Kobayashi, Y. Matsuzaki, H. Morishita, S. Miwa, Y. Suzuki, M. Fujiwara and N. Mizuochi, Phys. Rev.
Applied 14, 044033 (1-10) (2020).
12. Gate-Tunable Spin XOR Operation in a Silicon-Based Device at Room Temperature: R. Ishihara, Y. Ando, S. Lee,
R. Ohshima, M. Goto, S. Miwa, Y. Suzuki, H. Koike and M. Shiraishi, Phys. Rev. Applied 13, 044010 (1-9) (2020).
13. *Low Gilbert damping in the nodal-line semimetal D03-Fe3Ga epitaxial thin film: S. Sakamoto, T. Higo, S. Tamaru,
H. Kubota, K. Yakushiji, S. Nakatsuji and S. Miwa, Phys. Rev. B 103, 165122 (1-5) (2021).
14. Physically Unclonable Functions With Voltage-Controlled Magnetic Tunnel Junctions: Y. Tanaka, M. Goto, A. K.
Shukla, K. Yoshikawa, H. Nomura, S. Miwa, S. Tomishima and Y. Suzuki, IEEE Trans. Magn. 57, 3400806 (1-6)(2021).
15. *Spin-orbit torque switching of the antiferromagnetic state in polycrystalline Mn3Sn/Cu/heavy metal heterostructures:
H. Tsai, T. Higo, K. Kondou, A. Kobayashi, T. Nakano, K. Yakushiji, S. Miwa, Y. Otani and S. Nakatsuji, AIP Advances
11, 045110 (1-6) (2021).
16. *Fabrication of polycrystalline Weyl antiferromagnetic Mn3Sn thin films on various seed layers: T. Nakano, T. Higo,
A. Kobayashi, S. Miwa, S. Nakatsuji and K. Yakushiji, Phys. Rev. Materials 5, 054402 (1-9) (2021).
17. *Giant Effective Damping of Octupole Oscillation in an Antiferromagnetic Weyl Semimetal: S. Miwa, S. Iihama,
T. Nomoto, T. Tomita, T. Higo, M. Ikhlas, S. Sakamoto, Y. Otani, S. Mizukami, R. Arita and S. Nakatsuji, Small Science
1, 2000062 (1-8) (2021).
18. *Large Hall Signal due to Electrical Switching of an Antiferromagnetic Weyl Semimetal State: H. Tsai, T. Higo, K.
Kondou, S. Sakamoto, A. Kobayashi, T. Matsuo, S. Miwa, Y. Otani and S. Nakatsuji, Small Science 1, 2000025 (1-9)(2021).
19. 電圧トルク MRAM に向けた新材料探索と磁化反転制御技術開発 : 野崎 隆行 , 山本 竜也 , 三輪 真嗣 , 鈴木 義茂 , 湯浅
新治 , まぐね 15, 15-23 (2020).
20. 磁気抵抗効果を使ったスピントロニクス現象 : 三輪 真嗣 , 電気評論 105, 21-28 (2020).

Division of Data-Integrated Materials Science
Fukushima group
We have developed an automatic exhaustive calculation tool which is based on the Korriga-Kohn-Rostoker coherent potential approximation (KKR-CPA) method. Our tool can explore the huge materials space consisting of disordered systems andconstruct large-scale materials databases. In this year, we implemented new features in our tool. One is the scale-bridging* Joint research among groups within ISSP.

172

ISSP Activity Report 2020

(multi-scale) simulation technique combining KKR-CPA and Monte Carlo methods for magnetocaloric materials. We applied
this method to MnCoGe alloys systems and succeeded in quantitatively evaluating the Curie temperature, magnetic entropy,
and isothermal entropy. Another is the calculation technique of electronic structures, magnetic properties, and transport
properties at finite temperature. Temperature effects often have a significant influence on the materials properties. To investigate the electronic structures at finite temperature, we need to incorporate the effects of local phonon excitations and spinwave (magnon) excitations in the framework of the KKR-CPA method. In the KKR Green's function method, the single-sitet-matrix is the sum of the coefficients of partial wave expansion at each atomic position and contains information of the singlesite scattering effect. We can thus replace the multiple scattering effect by an effective medium potential using CPA. The
local phonon excitation and magnon excitation can be treated as as the configuration average with respect to the local phonon
displacements and local moment disorder (LMD) states, respectively. We performed KKR-CPA calculations of temperaturedependent electronic structures and transport properties of the half-metallic Heusler alloy Co2MnSi. The electrical resistivity
was calculated by the Kubo-Greenwood formula. For Co2MnSi, due to impurity scattering by the Mn-Co antisite disorder, arather large residual resistivity exists. Hundling the local phonon, magnon, and Mn-Co antisite disorders simultaneously by
CPA, we were able to reproduce the experimentally observed temperature-dependent resistivity. Thus, we not only calculated
the electronic structures incorporating temperature effects, which are difficult for conventional first-principles approaches,
but also estimated the transport properties of the half-metallic Heusler alloy. Our method replicated the experiments and wasdemonstrated to be effective. Applying this method to other Heusler alloys and superlattices with giant magnetoresistance(GMR) and TMR structures, it will be possible to exploit theoretically-driven materials design of next-generation spintronics.
1.

Hole-mediated ferromagnetism in a high-magnetic moment material, Gd-doped GaN: A. Masago, H. Shinya,
T. Fukushima, K. Sato and H. Katayama-Yoshida, J. Phys.: Condens. Matter 32, 485803(1-6) (2020).

2.

Magnetocaloric effect in MnCoGe alloys studied by first-principles calculations and Monte-Carlo simulation: H. B.
Tran, T. Fukushima, Y. Makino and T. Oguchi, Solid State Commun. 323, 114077(1-5) (2020).

3.

*First-principles calculations of finite temperature electronic structures and transport properties of Heusler alloy

4.

Tuning structural-transformation temperature toward giantmagnetocaloric effect in MnCoGe alloy: A theoretical study:
H. B. Tran, T. Fukushima, K. Sato, Y. Makino and T. Oguchi, J. Alloys Compd. 854, 157063(1-9) (2020).

5.

Spin injection through energy-band symmetry matching with high spin polarization in atomically controlled ferromagnet/ferromagnet/ semiconductor structures: M. Yamada, F. Kuroda, M. Tsukahara, S. Yamada, T. Fukushima,
K. Sawano, T. Oguchi and K. Hamaya, NPG Asia Mater. 12, 47(1-9) (2020).

6.

Valence states and the magnetism of Eu ions in Eu-doped GaN: T. Nunokawa, Y. Fujiwara, Y. Miyata, N. Fujimura,T. Sakurai, H. Ohta, A. Masago, H. Shinya, T. Fukushima, K. Sato and H. Katayama-Yoshida, J. Appl. Phys 127,083901(1-7) (2020).

7.

High Curie temperature in Eu-doped GaN caused by volume-compensated Ga-vacancy: A. Masago, H. Shinya,
T. Fukushima, K. Sato and H. Katayama-Yoshida, AIP Adv. 10, 025216(1-4) (2020).

8.

First-principles calculation of electronic density of states and Seebeck coefficient in transition-metal-doped Si–
Ge alloys: R. Yamada, A. Masago, T. Fukushima, H. Shinya, T. Q. Nguyen and K. Sato, Solid State Commun. 323,
110227(1-8) (2021).

9.

Effect of atomic configuration on magnetic properties and electronicstate of CoVMnAl quaternary heusler alloy:
R. Y. Umetsu, K. Saito, K. Ono, T. Fukushima, F. Kuroda, T. Oguchi and T. Ishigaki, J. Alloys Compd. 855,
157389(1-9) (2021).

Co2MnSi: H. Shinya, S. Kou, T. Fukushima, A. Masago, K. Sato, H. Katayama-Yoshida and H. Akai, Appl. Phys. Lett.
117, 042402(1-5) (2020).

10. Theoretical prediction of large anisotropic magnetocaloric effect in MnP: H. B. Tran, T. Fukushima, H. Momida,
K. Sato, Y. Makino and T. Oguchi, Comput. Mater. Sci. 188, 110227(1-8) (2021).
11. Intrinsic defect formation and the effect of transition metal doping on transport properties in a ductile thermoelectricmaterial α-Ag2S: a first-principles study: H. N. Nam, R. Yamada, H. Okumura, T. Q. Nguyen, K. Suzuki, H. Shinya,
A. Masago, T. Fukushima and K. Sato, Phys. Chem. Chem. Phys (2021), accepted for publication.

† Joint research with outside partners.

ISSP Activity Report 2020173

Materials Design and Characterization Laboratory
Hiroi group
A new titanium hydride complex BaCa2Ti2H14 with the 9-fold coordination was discovered. A new spin-orbit-coupled metal
candidate PbRe2O6 was studied. Kitaev spin liquid candidate OsxCl3 comprised of honeycomb nano-domains was investigated.
A multipolar order in the spin-orbit-coupled 5d Mott insulator B2MgReO6 was studied by high-resolution XRD.
1.

*Domain Control by Adjusting Anisotropic Stress in Pyrochlore Oxide Cd Re O : S. Tajima, D. Hirai, Y. Kinoshita,
2 2 7

2.

*Kitaev Spin Liquid Candidate Os Cl Comprised of Honeycomb Nano-Domains: K. Kataoka, D. Hirai, T. Yajima,x 3

3.

Variation in Superconducting Symmetry Against Pressure on Noncentrosymmetric Superconductor Cd2Re2O7
Revealed by 185/187Re Nuclear Quadrupole Resonance: S. Kitagawa, K. Ishida, T. C. Kobayashi, Y. Matsubayashi,
D. Hirai and Z. Hiroi, J. Phys. Soc. Jpn. 89, 053701 (2020).

4.

Anomalous changes of electric quadrupole order at low temperatures in the spin-orbit coupled metal Cd2Re2O7: S. Uji,
S. Sugiura, H. T. Hirose, T. Terashima, Y. Matsubayashi, D. Hirai, Z. Hiroi and T. Hasegawa, Phys. Rev. B 102, 155131(2020).

5.

Antiferromagnetic long-range order in the 5d(1) double-perovskite Sr2MgReO6: S. Gao, D. Hirai, H. Sagayama,
H. Ohsumi, Z. Hiroi and T.-H. Arima, Phys. Rev. B 101, 220412 (2020).

6.

Coexistence of odd-parity and even-parity order parameters in the multipole order phase of the spin-orbit coupled metal
Cd2Re2O7: Y. Matsubayashi, K. Sugii, D. Hirai, Z. Hiroi, T. Hasegawa, S. Sugiura, H. T. Hirose, T. Terashima andS. Uji, Phys. Rev. B 101, 205133 (2020).

7.

*Helicaland collinear spin density wave order in the S = 1/2 one-dimensional frustrated chain compound
NaCuMoO4(OH) investigated by neutron scattering: S. Asai, T. Oyama, K. Nawa, A. Nakao, K. Munakata,
K. Kuwahara, M. Hagihala, S. Itoh, Z. Hiroi and T. Masuda, Phys. Rev. B 101, 144437(1-8) (2020).

8.

*Zero-energy

9.

*Anisotropic Triangular Lattice Realized in Rhenium Oxychlorides A ReO Cl (A = Ba, Sr): D. Hirai, T. Yajima,3
5 2

M. Tokunaga, K. Akiba, T. C. Kobayashi, H. T. Hirose and Z. Hiroi, J. Phys. Soc. Jpn. 89, 114711 (2020).

D. Nishio-Hamane, R. Ishii, K.-Y. Choi, D. Wulferding, P. Lemmens, S. Kittaka, T. Sakakibara, H. Ishikawa, A. Matsuo,
K. Kindo and Z. Hiroi, J. Phys. Soc. Jpn. 89, 114709(1-9) (2020).

excitation in the classical kagome antiferromagnet NaBa2Mn3F11: S. Hayashida, H. Ishikawa,Y. Okamoto, T. Okubo, Z. Hiroi, G. J. Nilsen, H. Mutka and T. Masuda, Phys. Rev. B 101, 214409 (2020).
K. Nawa, M. Kawamura and Z. Hiroi, Inorg. Chem. 59, 10025 (2020).

10. Titanium Hydride Complex BaCa2Ti2H14 with 9-Fold Coordination: T. Yajima, H. Nakajima, T. Honda, K. Ikeda,
T. Otomo, H. Takeda and Z. Hiroi, Inorg. Chem. 59, 4228 (2020).
11. *Spin–orbit-coupled metal candidate PbRe2O6: S. Tajima, D. Hirai, T. Yajima, D. Nishio-Hamane, Y. Matsubayashi and
Z. Hiroi, Journal of Solid State Chemistry 288, 121359 (2020).
12. *Thermal Hall Effects of Spins and Phonons in Kagome Antiferromagnet Cd-Kapellasite: M. Akazawa, M. Shimozawa,
S. Kittaka, T. Sakakibara, R. Okuma, Z. Hiroi, H.-Y. Lee, N. Kawashima, J. H. Han and M. Yamashita, Phys. Rev. X 10,041059 (2020).
13. Detection of multipolar orders in the spin-orbit-coupled 5d Mott insulator B2MgReO6: D. Hirai, H. Sagayama, S. Gao,
H. Ohsumi, G. Chen, T.-H. Arima and Z. Hiroi, Phys. Rev. Research 2, 022063 (2020).
14. †*Single shot x-ray diffractometry in SACLA with pulsed magnetic fields up to 16 T: A. Ikeda, Y. H. Matsuda, X. Zhou,
T. Yajima, Y. Kubota, K. Tono and M. Yabashi, Phys. Rev. Research 2, 043175 1-6 (2020).
15. *Pressure-induced phase transition in the J1-J2 square lattice antiferromagnet RbMoOPO4Cl: H. Takeda, T. Yamauchi,
M. Takigawa, H. Ishikawa and Z. Hiroi, Phys. Rev. B 103, 104406 (2021).

Kawashima group
We developed highly efficient methods, algorithms, and parallelized programs based on the tensor network (TN) method andapplied them to relevant physical problems, which include the following: (1) development of decomposition method of a highranked tensor into a ring of smaller low-ranked tensors, (2) development of TN method for boundary phenomena, (3) study ofKitaev spin liquid by TN variational functions, (4) study of spin liquid in frustrated spin systems, (5) TN study of deconfinedcritical phenomena, and (6) TN implementation of rael-space renormalization group.
* Joint research among groups within ISSP.

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1.

Frustration-induced supersolid phases of extended Bose–Hubbard model in the hard-core limit: W.-L. Tu, H.-K. Wu and
T. Suzuki, J. Phys.: Condens. Matter 32, 455401 (2020).

2.

Tensor-Ring Decomposition with Index-Splitting: H.-Y. Lee and N. Kawashima, J. Phys. Soc. Jpn. 89, 054003(1-9)(2020).

3.

Abelian and non-Abelian chiral spin liquids in a compact tensor network: H.-Y. Lee, R. Kaneko, T. Okubo and
N. Kawashima, Phys. Rev. B 101, 035140 (2020).

4.

Boundary conformal spectrum and surface critical behavior of classical spin systems:A tensor network renormalization
study: S. Iino, S. Morita and N. Kawashima, Phys. Rev. B 101, 155418 (2020).

5.

Construction of variational matrix product states for the Heisenberg spin-1 chain: J. Kim, M. Kim, N. Kawashima, J. H.
Han and H.-Y. Lee, Phys. Rev. B 102, 085117(1-8) (2020).

6.

Competing quantum phases of hard-core bosons with tilted dipole-dipole interaction: H.-K. Wu and W.-L. Tu, Phys.
Rev. A 102, 053306 (2020).

7.

*Thermal Hall Effects of Spins and Phonons in Kagome Antiferromagnet Cd-Kapellasite: M. Akazawa, M. Shimozawa,
S. Kittaka, T. Sakakibara, R. Okuma, Z. Hiroi, H.-Y. Lee, N. Kawashima, J. H. Han and M. Yamashita, Phys. Rev. X 10,041059 (2020).

8.

Magnetic field induced quantum phases in a tensor network study of Kitaev magnets: H.-Y. Lee, R. Kaneko, L. E.
Chern, T. Okubo, Y. Yamaji, N. Kawashima and Y. B. Kim, Nature Communications 11, 1639 (2020).

9.

Magnetic field induced competing phases in spin-orbital entangled Kitaev magnets: L. E. Chern, R. Kaneko, H.-Y. Lee
and Y. B. Kim, Phys. Rev. Research 2, 013014 (2020).

10. Tensor network wave function of S=1 Kitaev spin liquids: H.-Y. Lee, N. Kawashima and Y. B. Kim, Phys. Rev.
Research 2, 033318(1-6) (2020).
11. * 分子動力学計算による複雑流体中のカルマン渦の解析 : 浅野 優太 , 渡辺 宙志 , 野口 博司 , 分子シミュレーション学会誌" アンサンブル " 22, 157-162 (2020).
12. Effective Ruderman–Kittel–Kasuya–Yosida-like Interaction in Diluted Double-exchange Model: Self-learning Monte
Carlo Approach: H. Kohshiro and Y. Nagai, J. Phys. Soc. Jpn. 90, 034711 (2021).
13. Continuous phase transition between Neel and valence bond solid phases in a J-Q-like spin ladder system: T. Ogino,
R. Kaneko, S. Morita, S. Furukawa and N. Kawashima, Phys. Rev. B 103, 085117 (2021).
14. Global optimization of tensor renormalization group using the corner transfer matrix: S. Morita and N. Kawashima,
Phys. Rev. B 103, 045131(1-6) (2021).
15. †*DSQSS: Discrete Space Quantum Systems Solver: Y. Motoyama, K. Yoshimi, A. Masaki-Kato, T. Kato and
N. Kawashima, Computer Physics Communications 264, 107944 (2021).
16. †*Kω— Open-source library for the shifted Krylov subspace method of the form (zI - H)x = b: T. Hoshi, M. Kawamura,
K. Yoshimi, Y. Motoyama, T. Misawa, Y. Yamaji, S. Todo, N. Kawashima and T. Sogabe, Computer Physics Communications 258, 107536 (2021).
17. "Data Assimilation Method for Experimental and First-Principles Data: Finite-Temperature Magnetization of(Nd,Pr,La,Ce)2(Fe,Co,Ni)14B": Y. Harashima, K. Tamai, S. Doi, M. Matsumoto, H. Akai, N. Kawashima, M. Ito,
N. Sakuma, A. Kato, T. Shoji and T. Miyake, Phys. Rev. Materials 5, 013806(1-10) (2021).
18. Scaling dimensions from linearized tensor renormalization group transformations: X. Lyu, R. G. Xu and N. Kawashima,
Phys. Rev. Research 3, 023048 (2021).
19. Boundary CFT and Tensor Network Approach to Surface Critical Phenomena of the Tricritical 3-State Potts model:
S. Iino, J Stat Phys 182, 56 (2021).
20. DSQSS: Discrete Space Quantum Systems Solver: Y. Motoyama, K. Yoshimi, A. Masaki-Kato, T. Kato and
N. Kawashima, Computer Physics Communications 264, 107944 (2021), accepted for publication.

Uwatoko group
The effect of pressure on the unique electronic state of the antiferromagnetic (AF) compound EuCu2Ge2 has been measured ina wide temperature range from 10 mK to 300 K by electrical resistivity measurements up to 10 GPa. The results exhibit that
† Joint research with outside partners.

ISSP Activity Report 2020

175

critical pressure, ~6.5 GPa, coincides with valence transition pressure, corresponding to the quantum criticality of the valencetransition. A “palm” cubic-anvil pressure cell (PCAC) having an outer diameter of 60 mm, the smallest cubic-anvil cell to date,
was fabricated to physical measurements with superconducting magnet. The PCAC is advantageous because a large sample
space and pressure homogeneity are secured even under frozen pressure media environment at high pressures. We investigate
the pressure effect on the large anomalous Hall effect (AHE) of Co3Sn2S2 up to 12 GPa with a palm cubic anvil cell apparatus
and first-principles calculations simulation. We find that both the ferromagnetic transition temperature and the AHE aresuppressed monotonically upon the application of high pressure. Combined with theoretical calculations, our results indicatethat the distance between Weyl points with opposite chirality in Co3Sn2S2 is substantially reduced accompanying the suppression of ferromagnetism by pressure, thus providing an experimental route to tune the AHE of magnetic Weyl semimetals via
modifying the nontrivial band topology.
1.

Pressure effect on the magnetoresistivity of topological semimetal RhSn: S. Xu, S. Xu, J. Sun, B. Wang, Y. Uwatoko,
T. Xia and J. Cheng, J. Phys.: Condens. Matter 32, 355601(1-6) (2020).

2.

Magnetoelectric Effect in the Antiferromagnetic Ordered State of Ce3TiBi5 with Ce Zig-Zag Chains: M. Shinozaki,
G. Motoyama, M. Tsubouchi, M. Sezaki, J. Gouchi, S. Nishigori, T. Mutou, A. Yamaguchi, K. Fujiwara, K. Miyoshi and
Y. Uwatoko, J. Phys. Soc. Jpn. 89, 033703(1-5) (2020).

3.

Quantum Criticality of Valence Transition for the Unique Electronic State of Antiferromagnetic Compound EuCu2Ge2:
J. Gouchi, K. Miyake, W. Iha, M. Hedo, T. Nakama, Y. Ônuki and Y. Uwatoko, J. Phys. Soc. Jpn. 89, 053703(1-5)(2020).

4.

Single-Crystal Growth and Physical Properties of EuZn2Ge2: M. Kosaka, S. Michimura, H. Hirabayashi, R. Numakura,
R. Iizuka, K. Kuwahara and Y. Uwatoko, J. Phys. Soc. Jpn. 89, 054704(1-8) (2020).

5.

Coupled magnetic and structural phase transitions in the antiferromagnetic polar metal Pb2CoOsO6 under pressure:
Y. Jiao, Y.-W. Fang, J. Sun, P. Shan, Z. Yu, H. L. Feng, B. Wang, H. Ma, Y. Uwatoko, K. Yamaura, Y. Guo, H. Chen and
J. Cheng, Phys. Rev. B 102, 144418(1-7) (2020).

6.

High pressure investigation of an organic three-dimensional Dirac semimetal candidate having a diamond lattice:
A. Kiswandhi, M. Maesato, S. Tomeno, Y. Yoshida, Y. Shimizu, P. Shahi, J. Gouchi, Y. Uwatoko, G. Saito and
H. Kitagawa, Phys. Rev. B 101, 245124(1-7) (2020).

7.

*Magnetotransport properties of tellurium under extreme conditions: K. Akiba, K. Kobayashi, T. C. Kobayashi,

8.

Physical properties and pressure-induced superconductivity in the single-crystalline band insulator SnO: S. Xu, Y. Zou,
J. Sun, Z. Liu, X. Yu, J. Gouchi, Y. Uwatoko, Z. G. Cheng, B. Wang and J. Cheng, Phys. Rev. B 101, 104501(1-8)(2020).

9.

Pressure-induced incommensurate antiferromagnetic order in a ferromagnetic B-site ordered double-perovskite
Lu2NiMnO6: N. Terada, C. V. Colin, N. Qureshi, T. C. Hansen, K. Matsubayashi, Y. Uwatoko and A. A. Belik, Phys.
Rev. B 102, 094412(1-9) (2020).

R. Koezuka, A. Miyake, J. Gouchi, Y. Uwatoko and M. Tokunaga, Phys. Rev. B 101, 245111(1-6) (2020).

10. *Sample dependence of half-integer quantized thermal Hall effect in the Kitaev spin-liquid candidate α-RuCl3:
M. Yamashita, J. Gouchi, Y. Uwatoko, N. Kurita and H. Tanaka, Phys. Rev. B 102, 220404(R) (2020).
11. Superconducting phase diagrams of S-doped 2H−TaSe2 under hydrostatic pressure: S. Xu, Z. Liu, P. Yang, K. Chen,
J. Sun, J. Dai, Y. Yin, F. Hong, X. Yu, M. Xue, J. Gouchi, Y. Uwatoko, B. Wang and J. Cheng, Phys. Rev. B 102,
184511(1-9) (2020).
12. Weak ferromagnetism and possible non-Fermi-liquid behavior in the itinerant electronic material Co3SnC: B. Wang,
Y. Uwatoko, J. Cheng and Y. Sun, Phys. Rev. B 102, 085153(1-9) (2020).
13. NMR study under pressure on the iron-based superconductor FeSe1-xSx (x = 0.12 and 0.23): Relationship between
nematicity and AF fluctuations: T. Kuwayama, K. Matsuura, Y. Mizukami, S. Kasahara, Y. Matsuda, T. Shibauchi,
Y. Uwatoko and N. Fujiwara, Mod. Phys. Lett. B 34, 2040048(1-6) (2020).
14. Effects of Substituted Elements on Spin Reorientation in Mn2-xFexSb1-ySny: K. Noguchi, Y. Mitsui, M. Hiroi, R. Y.
Umetsu, J. Gouchi, Y. Uwatoko and K. Koyama, Mater. Trans. 61, 1492-1495 (2020).
15. Magnetic Field Effect on Nitrogenation of Sm2Fe17: K. Koyama, M. Onoue, R. Kobayashi, Y. Mitsui, R. Y. Umetsu andY. Uwatoko, Mater. Trans. 61, 1487-1491 (2020).
16. Magnetic Measurements of Narrow-Gap Semiconductor FeSb2 under High Pressure: T. Deguchi, K. Matsubayashi,
Y. Uwatoko, T. Koyama, T. Kohara, H. Nakamura, Y. Mitsui and K. Koyama, Mater. Trans. 61, 1476(1-4) (2020).

* Joint research among groups within ISSP.

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17. New phenomena of photo-luminescence and persistent luminescence of a Eu2+ ,Tb3+ codoped Ca6BaP4O17 phosphor
under high hydrostatic pressure: H. Guo, T. Seto, T. Geng, B. Zou, G. Li, Y. Uwatoko, Z. Tang, Z. Li and Y. Wang,
Dalton Trans. 49, 8056-2059 (2020).
18. Resistive anisotropy of candidate excitonic insulator Ta2NiSe5 under pressure: H. Arima, Y. Naito, K. Kudo,
N. Katayama, H. Sawa, M. Nohara, Y. F. Lu, K. Kitagawa, H. Takagi, Y. Uwatoko and K. Matsubayashi, J. Phys.: Conf.
Ser. 1609, 012001(1-6) (2020).
19. Pressure-Driven Eu2+-Doped BaLi2Al2Si2N6 : A New Color Tunable Narrow-Band Emission Phosphor for Spectroscopy
and Pressure Sensor Applications: Y. Wang, T. Seto, K. Ishigaki, Y. Uwatoko, G. Xiao, B. Zou, G. Li, Z. Tang, Z. Li andY. Wang, Adv. Funct. Mater. 1, 2001384(1-10) (2020).
20. *Single Crystal Growth and Unique Electronic States of Cubic Chiral EuPtSi and Related Compounds: Y. Ônuki,
M. Kakihana, W. Iha, K. Nakaima, D. Aoki, A. Nakamura, F. Honda, M. Nakashima, Y. Amako, J. Gouchi, Y. Uwatoko,
S. Nakamura, T. Sakakibara, T. Takeuchi, Y. Haga, H. Ikeda, H. Harima, M. Hedo and T. Nakama, JPS Conf. Proc. 29,012001(1-9) (2020).
21. *Unique Skyrmion Phases and Conduction Electrons in Cubic Chiral Antiferromagnet EuPtSi and Related Compounds:
Y. Ônuki, M. Kakihana, W. Iha, K. Nakaima, D. Aoki, A. Nakamura, F. Honda, M. Nakashima, Y. Amako, J. Gouchi,
Y. Uwatoko, S. Nakamura, T. Sakakibara, T. Takeuchi, Y. Haga, H. Ikeda, H. Harima, M. Hedo and T. Nakama, JPS
Conf. Proc. 30, 011008(1-11) (2020).
22. Pressure-induced second high-Tc superconducting phase in the organic-ion-intercalated (CTA)0.3FeSe single crystal:J. P. Sun, M. Z. Shi, B. Lei, S. X. Xu, Y. Uwatoko, X. H. Chen and J. -G. Cheng, EPL 130, 67004(1-5) (2020).
23. Pressure effect on the anomalous Hall effect of ferromagnetic Weyl semimetal Co3Sn2S2: Z. Y. Liu, T. Zhang, S. X. Xu,
P. T. Yang, Q. Wang, H. C. Lei, Y. Sui, Y. Uwatoko, B. S. Wang, H. M. Weng, J. P. Sun and J. -G. Cheng, Phys. Rev.
Materials 4, 044203(1-9) (2020).
24. Fabrication and evaluation via nuclear quadrupole resonance of a palm cubic-anvil pressure cell: S. Nakagawa, J. Gochi,
T. Kuwayama, S. Nagasaki, T. Takahashi, J. Cheng, Y. Uwatoko and N. Fujiwara, Review of Scientific Instruments 91,
073907(1-7) (2020).
25. Heat treatment effect on the magnetic properties and martensitic transformations of MnCoGe: K. Noguchi,
R. Kobayashi, Y. Mitsui, R. Y. Umetsu, J. Gouchi, Y. Uwatoko and K. Koyama, Journal of Magnetism and Magnetic
Materials 499, 166199(1-5) (2020).
26. Magnetic field-induced nitridation of Sm2Fe17: M. Onoue, R. Kobayashi, Y. Mitsui, R. Y. Umetsu, Y. Uwatoko andK. Koyama, Journal of Alloys and Compounds 835, 155193(1-7) (2020).
27. Superconducting-Gap Anisotropy of Iron Pnictides Investigated via Combinatorial Microwave Measurements:
T. Okada, Y. Imai, K. Kitagawa, K. Matsubayashi, M. Nakajima, A. Iyo, Y. Uwatoko, H. Eisaki and A. Maeda, Sci Rep
10, 7064(1-7) (2020).
28. Quasi-one-dimensional magnetic interactions and conduction electrons in EuCu5 and EuAu5 with the characteristic
hexagonal structure: S. Matsuda, J. Ota, K. Nakaima, W. Iha, J. Gouchi, Y. Uwatoko, M. Nakashima, Y. Amako,
F. Honda, D. Aoki, A. Nakamura, T. Takeuchi, Y. Haga, H. Harima, M. Hedo, T. Nakama and Y. Ônuki, Philosophical
Magazine JAN 2020, 1-14 (2020).
29. Redetermination of the crystal structure of R5Si4(R= Pr, Nd) from single-crystal X-ray diffraction data: K. Yokota,
R. Watanuki, M. Nakashima, M. Uehara, J. Gouchi, Y. Uwatoko and I. Umehara, Acta Crystallogr E Cryst Commun 76,
510 (2020).
30. Pressure-Induced Metallization and Structural Phase Transition in the Quasi-One-Dimensional TlFeSe2: Z.-Y. Liu,
Q.-X. Dong, P.-F. Shan, Y.-Y. Wang, J.-H. Dai, R. Jana, K.-Y. Chen, J.-P. Sun, B.-S. Wang, X.-H. Yu, G.-T. Liu,
Y. Uwatoko, Y. Sui, H.-X. Yang, G.-F. Chen and J.-G. Cheng, Chinese Phys. Lett. 37, 047102 (2020).
31. Crystallographic and superconducting properties of filled skutterudite SrOs 4P12: Y. Kawamura, S. Deminami,
K. Takeda, T. Kuzuya, L. Salamakha, H. Michor, E. Bauer, J. Gouchi, Y. Uwatoko, T. Kawae and C. Sekine, Phys. Rev.
B 103, 085139(1-9) (2021).
32. *Strongly correlated superconductivity in a copper-based metal-organic framework with a perfect kagome lattice:
T. Takenaka, K. Ishihara, M. Roppongi, Y. Miao, Y. Mizukami, T. Makita, J. Tsurumi, S. Watanabe, J. Takeya,
M. Yamashita, K. Torizuka, Y. Uwatoko, T. Sasaki, X. Huang, W. Xu, D. Zhu, N. Su, J. -G. Cheng, T. Shibauchi and
K. Hashimoto, Sci. Adv. 7, eabf3996(1-8) (2021).
33. Author Correction: Experimental evidence for the existence of a second partially-ordered phase of ice VI: R. Yamane,† Joint research with outside partners.

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177

K. Komatsu, J. Gouchi, Y. Uwatoko, S. Machida, T. Hattori, H. Ito and H. Kagi, Nat Commun 12, 1800 (2021).
34. Experimental evidence for the existence of a second partially-ordered phase of ice VI: R. Yamane, K. Komatsu,
J. Gouchi, Y. Uwatoko, S. Machida, T. Hattori, H. Ito and H. Kagi, Nat Commun 12, 1129(1-6) (2021).
35. High-pressure phase diagrams of FeSe1-xTex: correlation between suppressed nematicity and enhanced superconductivity: K. Mukasa, K. Matsuura, M. Qiu, M. Saito, Y. Sugimura, K. Ishida, M. Otani, Y. Onishi, Y. Mizukami, K. Hashimoto, J. Gouchi, R. Kumai, Y. Uwatoko and T. Shibauchi, Nat Commun 12, 381(1-7) (2021).
36. Pressure induced superconducting state in ideal topological insulator BiSbTe3: V. K. Gangwar, S. Kumar, M. Singh,
L. Ghosh, Y. Zhang, P. Shahi, M. Muntwiler, S. Patil, K. Shimada, Y. Uwatoko, J. Sau, M. Kumar and S. Chatterjee,
Phys. Scr. 96, 055802(1-8) (2021).
37. Internal and External Pressure Effects on Superconductivity in FeTe xSe1-x (x = 0.46, 0.54) Single Crystals:
G. Lingannan, K. Ganesan, S. Mariappan, R. Sankar, Y. Uwatoko and S. Arumugam, J Supercond Nov Magn 34,
725-731 (2021).

Ozaki group
In FY2020, we studied two issues: one is an investigation to unveil structural trends of ternary transition metal nano-particles,
and the other is the first-principles calculation of superconducting transition temperature of elemental bulks. (1) As the firstissue, we performed first-principles calculations and Monte Carlo sampling to investigate the structures of ternary PdRuM(M = Pt, Rh, or Ir) nanoparticles (NPs) with respect to three different spherical shapes. The calculations show that the atomic
position is dominant in determining the stability of the ternary NPs. For bare ternary NPs, Pd and Ru atoms favor a location on
the vertex sites and the core, respectively, which can be understood by the surface energy of the corresponding slab models. For
single-crystalline NPs, the binary shell could be either a solid solution or a segregation alloy depending on composition andmorphology. However, polycrystalline Ih NPs only form segregated binary shells surrounding the Ru core. Such configurations
tend to minimize the surface lattice to gain more energy from the d orbital of the transition metals. In addition to the bare NPs,
we study the oxidized ternary NPs. The results show that the Ru atoms penetrate outwards from the core to the surface reducing
the oxidation formation energy. This work clearly demonstrates the structural trends of small ternary NPs, unveiling that thestructural trends can be understood by the surface formation energy and the interplay between adsorbent and adsorbing oxygen
atoms. (2) As the second issue, we performed systematic calculations to understand the applicability and limitation of Density
functional theory for superconductors (SCDFT), which is one of the first-principles methods to compute Tc, and can treat theelectron-phonon interaction, electronic Coulomb interaction, and spin fluctuation (SF) fully non-empirically. This method has
been applied to mainly the phonon-mediated superconductors. For example, SCDFT is used to reveal the origin of the multiband superconductivity in MgB, the relationship between the structure and Tc of hydrogen sulfides. We plan to apply thismethod to a wide variety of materials and accelerate the first-principles exploration of superconductors. For this purpose, we aredeveloping an open-source software Superconducting-Toolkit (SCTK), and release that software on the Web. In this study, we
performed a benchmark to the simplest superconductors and non-superconductors, namely 35 elemental metals; we formulated
a method to treat SF together with the spin-orbit interaction (SOI) and investigate these two effects on Tc. We believe that thisbenchmark study will be a milestone for exploring superconductors with high-throughput computations and methodologicalimprovements in the future.
1.

Benchmark of density functional theory for superconductors in elemental materials: M. Kawamura, Y. Hizume andT. Ozaki, Phys. Rev. B 101, 134511 (2020).

2.

*Emergence of nearly flat bands through a kagome lattice embedded in an epitaxial two-dimensional Ge layer with

3.

First-principles study on the stability and electronic structure of monolayer GaSe with trigonal-antiprismatic structure:
H. Nitta, T. Yonezawa, A. Fleurence, Y. Yamada-Takamura and T. Ozaki, Phys. Rev. B 102, 235407 (2020).

4.

Unfolding optical transition weights of impurity materials for first-principles LCAO electronic structure calculations:
Y.-T. Lee, C.-C. Lee, M. Fukuda and T. Ozaki, Phys. Rev. B 102, 075143 (2020).

5.

*Formation of BN-covered silicene on ZrB /Si(111) by adsorption of NO and thermal processes: J. Yoshinobu,
26.

*Structural investigation of ternary PdRuM (M = Pt, Rh, or Ir) nanoparticles using first-principles calculations: S.-H.

7.

*Electronic structure of a (3×3)-ordered silicon layer on Al(111): Y. Sato, Y. Fukaya, M. Cameau, A. K. Kundu,

a bitriangular structure: A. Fleurence, C. -C. Lee, R. Friedlein, Y. Fukaya, S. Yoshimoto, K. Mukai, H. Yamane,
N. Kosugi, J. Yoshinobu, T. Ozaki and Y. Yamada-Takamura, Phys. Rev. B 102, 201102 (2020).

K. Mukai, H. Ueda, S. Yoshimoto, S. Shimizu, T. Koitaya, H. Noritake, C.-C. Lee, T. Ozaki, A. Fleurence, R. Friedlein
and Y. Yamada-Takamura, J. Chem. Phys. 153, 064702 (2020).
Hung, H. Akiba, O. Yamamuro and T. Ozaki, RSC Adv. 10, 16527 (2020).

D. Shiga, R. Yukawa, K. Horiba, C.-H. Chen, A. Huang, H.-T. Jeng, T. Ozaki, H. Kumigashira, M. Niibe and I.
* Joint research among groups within ISSP.

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Matsuda, Phys. Rev. Materials 4, 064005 (2020).
8.

Neural network atomic potential to investigate the dislocation dynamics in bcc iron: H. Mori and T. Ozaki, Phys. Rev.
Materials 4, 040601(R) (2020).

9.

*Vapochromism induced by intermolecular electron transfer coupled with hydrogen-bond formation in zinc dithiolene

complex: T. Fujino, M. Kawamura, T. Ozaki and H. Mori, J. Mater. Chem. C 8, 14939-14947 (2020).

10. First-principles adaptive-boost accelerated molecular dynamics simulation with effective boost potential construction
methods: a study of Li diffusion in Si crystal: M. Yamamoto, A. Ishii, S. Shinzato, S. Ogata and T. Ozaki, Japanese
Journal of Applied Physics 59, 125002 (2020).
11. Diverse densest binary sphere packings and phase diagram: R. Koshoji, M. Kawamura, M. Fukuda and T. Ozaki, Phys.
Rev. E 103, 023307 (2021).
12. †*Kω— Open-source library for the shifted Krylov subspace method of the form (zI - H)x = b: T. Hoshi, M. Kawamura,
K. Yoshimi, Y. Motoyama, T. Misawa, Y. Yamaji, S. Todo, N. Kawashima and T. Sogabe, Computer Physics Communications 258, 107536 (2021).
13. †*RESPACK: An ab initio tool for derivation of effective low-energy model of material: K. Nakamura, Y. Yoshimoto,
Y. Nomura, T. Tadano, M. Kawamura, T. Kosugi, K. Yoshimi, T. Misawa and Y. Motoyama, Computer Physics Communications 261, 107781 (2021).
14. Structure of one-dimensional monolayer Si nanoribbons on Ag(111): L. Feng, A. Shiotari, K. Yabuoshi, M. Fukuda,
T. Ozaki and Y. Sugimoto, Phys. Rev. Materials 5, 034002 (2021).
15. *The Simplest Model for Doped Poly(3,4-ethylenedioxythiophene) (PEDOT): Single-crystalline EDOT Dimer Radical
Cation Salts: R. Kameyama, T. Fujino, S. Dekura, M. Kawamura, T. Ozaki and H. Mori, Chem. Eur. J. 27, 6696 (2021).

Noguchi group
We have studied (1) Turing patterns on a vesicle by a reaction-diffusion system coupled with mechanochemical feedback, (2)the conformation of ultra-long-chain fatty acid in lipid bilayer, (3) the effects of cavitation on Karman vortex, and (4) soundwave propagation in a simple fluid. We also proposed (5) a new numerical method to calculate membrane mechanical properties.
1.

†Conformation of ultra-long-chain fatty acid in lipid bilayer: Molecular dynamics study: K. Kawaguchi, K. M.

2.

†Effects of cavitation on Kármán vortex behind circular-cylinder arrays: A molecular dynamics study: Y. Asano,3.

†Molecular dynamics simulation of soundwave propagation in a simple fluid: Y. Asano, H. Watanabe and H. Noguchi,

4.

†Virtual bending method to calculate bending rigidity, saddle-splay modulus, and spontaneous curvature of thin fluid

5.

Supramolecular Biocomposite Hydrogels Formed by Cellulose and Host–Guest Polymers Assisted by Calcium Ion
Complexes: H. Tsuchiya, G. Sinawang, T.-A. Asoh, M. Osaki, Y. Ikemoto, Y. Higuchi, H. Yamaguchi, A. Harada,
H. Uyama and Y. Takashima, Biomacromolecules 21, 3936 (2020).

6.

Pattern formation in reaction–diffusion system on membrane with mechanochemical feedback: N. Tamemoto and
H. Noguchi, Sci Rep 10, 19582 (2020).

7.

* 分子動力学計算による複雑流体中のカルマン渦の解析 : 浅野 優太 , 渡辺 宙志 , 野口 博司 , 分子シミュレーション学会誌

Nakagawa, S. Nakagawa, H. Shindou, H. Nagao and H. Noguchi, J. Chem. Phys. 153, 165101 (2020).

H. Watanabe and H. Noguchi, J. Chem. Phys. 152, 034501 (2020).
J. Chem. Phys. 153, 124504 (2020).

membranes: H. Noguchi, Phys. Rev. E 102, 053315 (2020).

" アンサンブル " 22, 157-162 (2020).

8.

†Rational Design Principles of Attenuated Cationic Lytic Peptides for Intracellular Delivery of Biomacromolecules:

9.

高分子材料の破壊に関する粗視化シミュレーション : 樋口 祐次 , 分子シミュレーション学会誌「アンサンブル」22, 216-221

N. Tamemoto, M. Akishiba, K. Sakamoto, K. Kawano, H. Noguchi and S. Futaki, Mol. Pharmaceutics 17, 2175-2185(2020).
(2020).

10. Coarse-grained molecular dynamics simulations of void generation and growth processes in the fracture of the lamellar
structure of polyethylene: Y. Higuchi, Phys. Rev. E 103, 042502 (2021).
† Joint research with outside partners.

ISSP Activity Report 2020179

11. Undulation of a moving fluid membrane pushed by filament growth: H. Noguchi and O. Pierre-Louis, Sci Rep 11, 7985
(2021).

Yoshimi group
We have developed and enhanced the usability of programs adopted in the project for advancement of software usability inmaterials science (PASUMS). Our group's activity of 2020 include development of (1) optimization tools for PHYSics basedon Bayesian Optimization (PHYSBO), (2) 2DMAT, and the enhancement of usability for (3) MateriApps Installer. In addition,
we have studied (1) derivation and analysis of low-energy effective Hamiltonian of organic conductors using software packages(RESPACK and HΦ) developed in PASUMS and (2) application of sparse modeling in quantum many body problems.
1.

†Finite Temperature Properties of Geometrically Charge Frustrated Systems: K. Yoshimi, M. Naka and H. Seo, J. Phys.

2.

†Sparse Modeling in Quantum Many-Body Problems: J. Otsuki, M. Ohzeki, H. Shinaoka and K. Yoshimi, J. Phys. Soc.

3.

†Transport properties of the organic Dirac electron system α-(BEDT−TSeF) I : D. Ohki, K. Yoshimi and A. Kobayashi,
2 3Phys. Rev. B 102, 235116 (2020).

4.

†Electronic correlation and geometrical frustration in molecular solids: A systematic ab initio study of β'−X[Pd(dmit) ] :2 2

5.

†Sparse sampling and tensor network representation of two-particle Green's functions: H. Shinaoka, D. Geffroy,

6.

†Multiple-magnon excitations shape the spin spectrum of cuprate parent compounds: D. Betto, R. Fumagalli, L. Marti-

7.

†*DSQSS: Discrete Space Quantum Systems Solver: Y. Motoyama, K. Yoshimi, A. Masaki-Kato, T. Kato and

8.

†*Kω— Open-source library for the shifted Krylov subspace method of the form (zI - H)x = b: T. Hoshi, M. Kawamura,

9.

†*RESPACK: An ab initio tool for derivation of effective low-energy model of material: K. Nakamura, Y. Yoshimoto,Soc. Jpn. 89, 034003 (2020).
Jpn. 89, 012001 (2020).

T. Misawa, K. Yoshimi and T. Tsumuraya, Phys. Rev. Research 2, 032072 (2020).

M. Wallerberger, J. Otsuki, K. Yoshimi, E. Gull and J. Kuneš, SciPost Phys. 8, 012 (2020).

nelli, M. Rossi, R. Piombo, K. Yoshimi, D. D. Castro, E. D. Gennaro, A. Sambri, D. Bonn, G. A. Sawatzky, L. Braicovich, N. B. Brookes, J. Lorenzana and G. Ghiringhelli, Phys. Rev. B 103, L140409 (2021).

N. Kawashima, Computer Physics Communications 264, 107944 (2021).

K. Yoshimi, Y. Motoyama, T. Misawa, Y. Yamaji, S. Todo, N. Kawashima and T. Sogabe, Computer Physics Communications 258, 107536 (2021).

Y. Nomura, T. Tadano, M. Kawamura, T. Kosugi, K. Yoshimi, T. Misawa and Y. Motoyama, Computer Physics Communications 261, 107781 (2021).

Materials Synthesis and Characterization group1.

Anisotropic Magnetic Field Dependence of Specific Heat in the Cubic Symmetric Quadrupolar Kondo Compound
Pr0.05La0.95Pb3: T. Kawae, M. Koga, Y. Sato, Y. Inagaki, T. Fujiwara, H. S. Suzuki and T. Kitai, J. Phys. Soc. Jpn. 89,
063704 (2020).

2.

Kondo-Induced Giant Isotropic Negative Thermal Expansion: D. G. Mazzone, M. Dzero, AM. M. Abeykoon,
H. Yamaoka, H. Ishii, N. Hiraoka, J. -P. Rueff, J. M. Ablett, K. Imura, H. S. Suzuki, J. N. Hancock and I. Jarrige, Phys.
Rev. Lett. 124, 125701 (2020).

3.

*Anisotropic Triangular Lattice Realized in Rhenium Oxychlorides A ReO Cl (A = Ba, Sr): D. Hirai, T. Yajima,
3
5 2

4.

*Spin–orbit-coupled metal candidate PbRe O : S. Tajima, D. Hirai, T. Yajima, D. Nishio-Hamane, Y. Matsubayashi and
2 6

K. Nawa, M. Kawamura and Z. Hiroi, Inorg. Chem. 59, 10025 (2020).
Z. Hiroi, Journal of Solid State Chemistry 288, 121359 (2020).

5.

Magnetic properties of oxides with high concentrations of rare-earth elements R6AO12 (R = rare-earth element, A = Moor W): M. Hase, N. Tsujii, H. S. Suzuki, O. Sakai and H. Mamiya, Journal of Magnetism and Magnetic Materials 523,
167539 (2020).

6.

*Devil's staircase transition of the electronic structures in CeSb: K. Kuroda, Y. Arai, N. Rezaei, S. Kunisada,

S. Sakuragi, M. Alaei, Y. Kinoshita, C. Bareille, R. Noguchi, M. Nakayama, S. Akebi, M. Sakano, K. Kawaguchi,
M. Arita, S. Ideta, K. Tanaka, H. Kitazawa, K. Okazaki, M. Tokunaga, Y. Haga, S. Shin, H. S. Suzuki, R. Arita andT. Kondo, Nat Commun 11, 2888/1-9 (2020).
* Joint research among groups within ISSP.

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ISSP Activity Report 2020

Neutron Science Laboratory
Yamamuro group
Our laboratory is studying chemical physics of complex condensed matters by using neutron scattering, X-ray diffraction,
calorimetric, dielectric, and viscoelastic techniques. Our target materials are glasses, liquids, and various disordered systems.
The highlight of this year is the inelastic neutron scattering (INS) experiment of vapor-deposited CS2 glass which was
performed on AMATERAS in J-PARC MLF. By combining the results of CS2 and CCl4, which was measured in 2018, we
have found the general relation between the low-energy excitations and local structures in the glass. The boson peak appears
independently of the local structure of the glass, while the dispersive phonon excitations adjacent to the boson peak strongly
depends on the quasi-network structure of the glass. Following the quasi-elastic neutron scattering (QENS) of a novel hydrogencluster material Li6NbH11 measured last year, the QENS experiment of Li5MoH11 was carried out on DNA in J-PARC MLF.
Both data demonstrate that the MH9 cluster is rotating rapidly with widely-distributed relaxation times, which may be causedby the conducting (positionally disordered) Li ions. The correlation between the conducting Li ions and hydrogen clusters wasfound also in the calorimetric experiment of novel Li conductors containing cage-like ions, Li(CB9H10) and 0.7Li(CB9H10)0.3Li(CB11H12). The synchrotron-radiation X-ray diffraction experiment was conducted in SPring-8 for the glass of a novel
metal-organic framework (MOF) material containing CO2 as guest molecules.
1.

Dynamics of Atomic Hydrogen in Palladium Probed by Neutron Spectroscopy: M. Kofu and O. Yamamuro, J. Phys.
Soc. Jpn. 89, 051002 (2020).

2.

Rational Synthesis for a Noble Metal Carbide: T. Wakisaka, K. Kusada, D. Wu, T. Yamamoto, T. Toriyama, S. Matsumura, H. Akiba, O. Yamamuro, K. Ikeda, T. Otomo, N. Palina, Y. Chen, L. S. R. Kumara, C. Song, O. Sakata, W. Xie,
M. Koyama, Y. Kubota, S. Kawaguchi, R. L. Arevalo, S. M. Aspera, E. F. Arguelles, H. Nakanishi and H. Kitagawa,J. Am. Chem. Soc. 142, 1247 (2020).

3.

New Insights on the Formation Process and Thermodynamics of the α-Phase PdH(D)x through Direct Enthalpy
Measurement of H(D) Dissolution: S. Dekura, H. Akiba, O. Yamamuro, H. Kobayashi, M. Maesato and H. Kitagawa,J. Phys. Chem. C 124, 8663-8668 (2020).

4.

Nanometric Fluctuations of Sound Velocity in Alkali Borate Glasses and Fragility of Respective Melts: S. Kojima, V. N.
Novikov, M. Kofu and O. Yamamuro, Phys. Status Solidi B 257, 2000073 (2020).

5.

Nanoscale Relaxation in “Water-in-Salt” and “Water-in-Bisalt” Electrolytes: M. A. González, O. Borodin, M. Kofu,
K. Shibata, T. Yamada, O. Yamamuro, K. Xu, D. L. Price and M. -L. Saboungi, J. Phys. Chem. Lett. 11, 7279 (2020).

6.

*Structural investigation of ternary PdRuM (M = Pt, Rh, or Ir) nanoparticles using first-principles calculations: S.-H.
Hung, H. Akiba, O. Yamamuro and T. Ozaki, RSC Adv. 10, 16527 (2020).

7.

Quasielastic Neutron Scattering Study on Polymorphism of Glycerol Deuterated Triacylglycerols: Comparison
with Saturated, Trans-unsaturated and Cis-unsaturated Triacylglycerols: C. Takechi, T. Kawaguchi, F. Kaneko andO. Yamamuro, Chem. Lett. 50, 435 (2021).

8.

ガラス転移温度 : 山室 修 ,「化学便覧基礎編改訂第 6 版」, 10.15, 日本化学会編 , ( 丸善出版 , 2020), 77-81.

Masuda group
The goal of our research is to discover a new quantum phenomenon and to reveal the mechanism of it. In this fiscal year westudied the following topics; Helical and collinear spin density wave order in the S = 1/2 one-dimensional frustrated chain
compound NaCuMoO4(OH) investigated by neutron scattering, Magnetic order in the chemically substituted frustrated antiferromagnet CsCrF4, Zero-energy excitation in the classical kagome antiferromagnet NaBa2Mn3F11, Magnetic correlations in
YBaCo4O7 on kagome and triangular lattices, etc.
1.

Analysis of Field-Induced Nonreciprocal Magnon in Noncollinear Magnet and Application to S = 1 Triangular Antiferromagnet CsFeCl3: M. Matsumoto, S. Hayashida and T. Masuda, J. Phys. Soc. Jpn. 89, 034710(1-17) (2020).

2.

Horizontal Line Nodes in Sr2RuO4 Proved by Spin Resonance: K. Iida, M. Kofu, K. Suzuki, N. Murai, S. OhiraKawamura, R. Kajimoto, Y. Inamura, M. Ishikado, S. Hasegawa, T. Masuda, Y. Yoshida, K. Kakurai, K. Machida andS. Lee, J. Phys. Soc. Jpn. 89, 053702(1-5) (2020).

3.

Mossbauer Study of Rare-earth Ferroborate NdFe3(BO3)4: S. Nakamura, T. Masuda, K. Ohgushi and T. Katsufuji,
J. Phys. Soc. Jpn. 89, 084703(1-6) (2020).

4.

†*Emergent spin-1 Haldane gap and ferroelectricity in a frustrated spin- 1/2 ladder: H. Ueda, S. Onoda, Y. Yamaguchi,

T. Kimura, D. Yoshizawa, T. Morioka, M. Hagiwara, M. Hagihala, M. Soda, T. Masuda, T. Sakakibara, K. Tomiyasu,† Joint research with outside partners.

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S. Ohira-Kawamura, K. Nakajima, R. Kajimoto, M. Nakamura, Y. Inamura, N. Reynolds, M. Frontzek, J. S. White,
M. Hase and Y. Yasui, Phys. Rev. B 101, 140408(1-6) (2020).
5.

*Helical and collinear spin density wave order in the S = 1/2 one-dimensional frustrated chain compound
NaCuMoO4(OH) investigated by neutron scattering: S. Asai, T. Oyama, K. Nawa, A. Nakao, K. Munakata,
K. Kuwahara, M. Hagihala, S. Itoh, Z. Hiroi and T. Masuda, Phys. Rev. B 101, 144437(1-8) (2020).

6.

Magnetic correlations in YBaCo4O7 on kagome and triangular lattices: M. Soda, S. Itoh, T. Yokoo, G. Ehlers,
H. Kawano-Furukawa and T. Masuda, Phys. Rev. B 101, 214444(1-7) (2020).

7.

Magnetic order in the chemically substituted frustrated antiferromagnet CsCrF4: S. Hayashida, M. Hagihala,
M. Avdeev, Y. Miura, H. Manaka and T. Masuda, Phys. Rev. B 102, 174440(1-6) (2020).

8.

Spin waves in the two-dimensional honeycomb lattice XXZ-type van der Waals antiferromagnet CoPS3: C. Kim,
J. Jeong, P. Park, T. Masuda, S. Asai, S. Itoh, H.-S. Kim, A. Wildes and J.-G. Park, Phys. Rev. B 102, 184429(1-8)(2020).

9.

*Zero-energy

excitation in the classical kagome antiferromagnet NaBa2Mn3F11: S. Hayashida, H. Ishikawa,Y. Okamoto, T. Okubo, Z. Hiroi, G. J. Nilsen, H. Mutka and T. Masuda, Phys. Rev. B 101, 214409 (2020).

10. The f-electron State of the Heavy Fermion Superconductor NpPd5Al2 and the Isostructural Family: N. Metoki, A. A.
Aczel, D. Aoki, S. Chi, J. A. Fernandez-Baca, J.-C. Griveau, M. Hagihala, T. Hong, Y. Haga, K. Ikeuchi, Y. Inamura,
K. Kamazawa, R. Kajimoto, H. Kitazawa, T. Masuda, M. Matsuda, M. Nakamura, J. Ohtsuki, D. Pajerowski, H. S.
Suzuki, E. Yamamoto and H. Yamauchi, JPS Conf. Proc. 30, 011123(1-6) (2020).
11. Establishing the carrier scattering phase diagram for ZrNiSn-based half-Heusler thermoelectric materials: Q. Ren, C. Fu,
Q. Qiu, S. Dai, Z. Liu, T. Masuda, S. Asai, M. Hagihala, S. Lee, S. Torri, T. Kamiyama, L. He, X. Tong, C. Felser, D. J.
Singh, T. Zhu, J. Yang and J. Ma, Nat Commun 11, 3142(1-9) (2020).
12. †*Gapless spin liquid in a square-kagome lattice antiferromagnet: M. Fujihala, K. Morita, R. Mole, S. Mitsuda,
T. Tohyama, S.-I. Yano, D. Yu, S. Sota, T. Kuwai, A. Koda, H. Okabe, H. Lee, S. Itoh, T. Hawai, T. Masuda,
H. Sagayama, A. Matsuo, K. Kindo, S. Ohira-Kawamura and K. Nakajima, Nat Commun 11, 3429 (2020).
13. Fermionic order by disorder in a van der Waals antiferromagnet: R. Okuma, D. Ueta, S. Kuniyoshi, Y. Fujisawa,B. Smith, C. H. Hsu, Y. Inagaki, W. Si, T. Kawae, H. Lin, F. C. Chuang, T. Masuda, R. Kobayashi and Y. Okada, Sci
Rep 10, 15311(8pages) (2020).
14. Dynamical Studies in Condensed Matter on High Resolution Chopper Spectrometer (HRC) —2nd Phase of HRC
Project—: S. Itoh, T. Masuda, T. Yokoo, H. Yoshizawa, M. Soda, S. Asai, Y. Ikeda, S. Ibuka, M. Yoshida, T. Hawai,
H. Saito, D. Kawana, R. Sugiura, T. Asami and Y. Ihata, JPS Conf. Proc. 33, 011058(1-7) (2021).

Nakajima group
Nakajima group has been studying magnetic materials showing cross-correlated phenomena related to topologically-nontrivial
magnetic structures. One example is magnetic skyrmion, which is vortex-like spin order behaving like a particle. In thisyear, we investigated crystallization process of magnetic skyrmions in a chiral magnet MnSi by means of neutron resonancespin-echo spectroscopy in J-PARC. We have been collaborating with scientists in KEK and Kyoto university to develop theresonance-type neutron spin echo spectrometer, and successfully observed spin echo signals revealing that the spin fluctuations
near the phase boundary between the paramagnetic and skyrmion lattice phases has a characteristic relaxation time of 1 ns. We
also studied rare-earth based skyrmion materials by resonant X-ray magnetic scattering, and also applied polarized small-angle
neutron scattering technique to a polar crystal hosting Neel-type magnetic skyrmion lattice.
1.

中性子散乱を用いた磁気スキルミオン研究 : 中島 多朗 , 有馬 孝尚 , 固体物理 55, 265-274 (2020).

2.

Crystallization of magnetic skyrmions in MnSi investigated by neutron spin echo spectroscopy: T. Nakajima, T. Oda,
M. Hino, H. Endo, K. Ohishi, K. Kakurai, A. Kikkawa, Y. Taguchi, Y. Tokura and T.-H. Arima, Phys. Rev. Research 2,043393 (2020).

3.

Nanometric square skyrmion lattice in a centrosymmetric tetragonal magnet: N. D. Khanh, T. Nakajima, X. Yu, S. Gao,
K. Shibata, M. Hirschberger, Y. Yamasaki, H. Sagayama, H. Nakao, L. Peng, K. Nakajima, R. Takagi, T.-H. Arima,
Y. Tokura and S. Seki, Nat. Nanotechnol. 15, 444 (2020).

4.

Direct Observation of Cycloidal Spin Modulation and Field-induced Transition in Néel-type Skyrmion-hosting
VOSe2O5: T. Kurumaji, T. Nakajima, A. Feoktystov, E. Babcock, Z. Salhi, V. Ukleev, T.-H. Arima, K. Kakurai and
Y. Tokura, J. Phys. Soc. Jpn. 90, 024705 (2021).

* Joint research among groups within ISSP.

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Mayumi group
We have discovered that slide-ring gels, in which polymer chains are cross-linked by ring molecules, show strain-induced
crystallization (SIC) under uniaxial stretching. The occurrence of SIC improves significantly the mechanical toughness of slidering gels. In addition, the crystalline formation is reversible in response to elongation and retraction, which results in the highmechanical reversibility under cyclic deformations. The novel toughening mechanism of hydrogels by SIC enables the simultaneous improvement of toughness and reversibility required for the applications of hydrogels as biomaterials, such as artificial
cartilage and prosthetic joints.

International MegaGauss Science Laboratory
Kindo group
We have examined an Fulde–Ferrell–Larkin–Ovchinnikov phase using some angle-resolved physical property measurements inpulsed magnetic fields, which have unveiled details of pair-breaking effects of the magnetic field on this phase. Magnetism of
the 4d and 5d transition metal double perovskites with strong spin-orbit coupling are investigated up to around 65 T. We discovered the ligand dependent magnetism in Cs2MX6 (M= Nb, Ta, X = Cl, Br) and the magnetic field induced phase transition at 50
T in Ba2CaReO6.
1.

†Ga Substitution Effect on the Valence Transition of Eu Pt Al : K. Oyama, A. Mitsuda, H. Wada, Y. Narumi,
2 6 15

2.

*Kitaev Spin Liquid Candidate Os Cl Comprised of Honeycomb Nano-Domains: K. Kataoka, D. Hirai, T. Yajima,x 3

3.

†Multi-Step

Magnetic Transitions in EuNiIn 4: S. Ikeda, K. Kaneko, Y. Tanaka, T. Kawasaki, T. Hanashima,
K. Munakata, A. Nakao, R. Kiyanagi, T. Ohhara, K. Mochizuki, A. Kondo, K. Kindo, Y. Homma, M. D. Frontzek and
H. Kobayashi, J. Phys. Soc. Jpn. 89, 014707(1-7) (2020).

4.

†Vanishment of Metamagnetic Transition in the Metal-to-Insulator Transition Compound BaVS under High Pressure:3

5.

†Angle-dependent

6.

†Data-driven determination of the spin Hamiltonian parameters and their uncertainties: The case of the zigzag-chain

7.

*Enhanced spin correlations in the Bose-Einstein condensate compound Sr Cr O : T. Nomura, Y. Skourski, D. L.
3 2 8

8.

*Observation of in-plane magnetic field induced phase transitions in FeSe: J. M. Ok, C. I. Kwon, Y. Kohama, J. S. You,

9.

*Quantum oscillations and magnetic field induced Fermi surface reconstruction in the charge density wave state of

M. Hagiwara, R. Takahashi, H. Wadati, H. Setoyama and K. Kindo, J. Phys. Soc. Jpn. 89, 114713 (2020).

D. Nishio-Hamane, R. Ishii, K.-Y. Choi, D. Wulferding, P. Lemmens, S. Kittaka, T. Sakakibara, H. Ishikawa, A. Matsuo,
K. Kindo and Z. Hiroi, J. Phys. Soc. Jpn. 89, 114709(1-9) (2020).

T. Tahara, T. Kida, Y. Narumi, T. Takeuchi, H. Nakamura, K. Miyake, K. Kindo and M. Hagiwara, J. Phys. Soc. Jpn. 89,
064711(1-5) (2020).

nontrivial phase in the Weyl semimetal NbAs with anisotropic Fermi surface: M. Komada,H. Murakawa, M. S. Bahramy, T. Kida, K. Yokoi, Y. Narumi, K. Kindo, M. Hagiwara, H. Sakai and N. Hanasaki, Phys.
Rev. B 101, 045135(1-6) (2020).
compound KCu4P3O12: R. Tamura, K. Hukushima, A. Matsuo, K. Kindo and M. Hase, Phys. Rev. B 101, 224435(1-9)(2020).

Quintero-Castro, A. A. Zvyagin, A. V. Suslov, D. Gorbunov, S. Yasin, J. Wosnitza, K. Kindo, A. T. M. N. Islam, B. Lake,
Y. Kohama, S. Zherlitsyn and M. Jaime, Phys. Rev. B 102, 165144 (2020).
S. K. Park, J.-H. Kim, Y. J. Jo, E. S. Choi, K. Kindo, W. Kang, K.-S. Kim, E. G. Moon, A. Gurevich and J. S. Kim,
Phys. Rev. B 101, 224509 (2020).
A0.9Mo6O17 (A = Na, K): H. P. Zhu, M. Yang, J. Z. Ke, H. K. Zuo, T. Peng, J. F. Wang, Y. Liu, X. Xu, Y. Kohama,
K. Kindo and M. Greenblatt, Phys. Rev. B 102, 235164 (2020).

10. Thermal and magnetoelastic properties of α−RuCl3 in the field-induced low-temperature states: R. Schönemann,
S. Imajo, F. Weickert, J. Yan, D. G. Mandrus, Y. Takano, E. L. Brosha, P. F. S. Rosa, S. E. Nagler, K. Kindo and M.
Jaime, Phys. Rev. B 102, 214432(1-7) (2020).
11. *Anisotropic Fully Gapped Superconductivity Possibly Mediated by Charge Fluctuations in a Nondimeric Organic
Complex: S. Imajo, H. Akutsu, R. Kurihara, T. Yajima, Y. Kohama, M. Tokunaga, K. Kindo and Y. Nakazawa, Phys.
Rev. Lett. 125, 177002 (2020).
12. †Nonmagnetic Ground States and a Possible Quadrupolar Phase in 4d and 5d Lacunar Spinel Selenides GaM4Se8 (M =† Joint research with outside partners.

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183

Nb, Ta): H. Ishikawa, T. Yajima, A. Matsuo, Y. Ihara and K. Kindo, Phys. Rev. Lett. 124, 227202(1-6) (2020).
13. †*Particle-Hole Symmetry Breaking in a Spin-Dimer System TlCuCl3 Observed at 100 T: X. -G. Zhou, Y. Yao, Y. H.
Matsuda, A. Ikeda, A. Matsuo, K. Kindo and H. Tanaka, Phys. Rev. Lett. 125, 267207 1-6 (2020).
14. †*Synthesis, Structure, and Anomalous Magnetic Ordering of the Spin-1/2 Coupled Square Tetramer System K(NbO)
Cu4(PO4)4: K. Kimura, D. Urushihara, T. Asaka, M. Toyoda, A. Miyake, M. Tokunaga, A. Matsuo, K. Kindo, K.
Yamauchi and T. Kimura, Inorg. Chem. 59, 10986-10995 (2020).
15. *Extracting the Chiral Contribution to the Negative Longitudinal Magnetoresistance in Epitaxial Pr2Ir2O7 Thin Films:
T. Ohtsuki, Z. Tian, A. Endo, M. Halim, S. Katsumoto, Y. Kohama, K. Kindo, M. Lippmaa and S. Nakatsuji, JPS Conf.
Proc. 30, 011181 (1-6) (2020).
16. Avoided quantum criticality and cluster-glass formation in itinerant ferromagnet Sr1−x(La0.5K0.5)xRuO3: R. Iwahara,
R. Sugawara, *. Rahmanto, Y. Honma, K. Matsuoka, A. Matsuo, K. Kindo, K. Tenya and M. Yokoyama, Phys. Rev.
Materials 4, 074404(1-8) (2020).
17. *Improved accuracy in high-frequency AC transport measurements in pulsed high magnetic fields: H. Mitamura,
R. Watanuki, E. Kampert, T. Förster, A. Matsuo, T. Onimaru, N. Onozaki, Y. Amou, K. Wakiya, K. T. Matsumoto,I. Yamamoto, K. Suzuki, S. Zherlitsyn, J. Wosnitza, M. Tokunaga, K. Kindo and T. Sakakibara, Review of Scientific
Instruments 91, 125107/1-25 (2020).
18. †*Gapless spin liquid in a square-kagome lattice antiferromagnet: M. Fujihala, K. Morita, R. Mole, S. Mitsuda,
T. Tohyama, S.-I. Yano, D. Yu, S. Sota, T. Kuwai, A. Koda, H. Okabe, H. Lee, S. Itoh, T. Hawai, T. Masuda,
H. Sagayama, A. Matsuo, K. Kindo, S. Ohira-Kawamura and K. Nakajima, Nat Commun 11, 3429 (2020).
19. *High-field phase diagram of Ni3V2O8 studied by specific heat and magnetocaloric effect measurements: C. Dong,
Y. Kohama, Z. Z. He, X. T. Han, K. Sato, A. Matsuo, K. Kindo, M. Yang and J. F. Wang, J. Phys.: Condens. Matter 33,
205402 (2021).
20. Ligand dependent magnetism of the J = 3/2 Mott insulator Cs2MX6 (M = Ta, Nb, X = Br, Cl): H. Ishikawa, T. Yajima,
A. Matsuo and K. Kindo, J. Phys.: Condens. Matter 33, 125802(1-6) (2021).
21. Magnetization Process in EuCo2P2 and EuT2Ge2 (T: transition metal): Comparison of Experiment and Theory:
T. Takeuchi, T. Tahara, T. Kida, Y. Narumi, M. Hagiwara, K. Kindo, W. Iha, Y. Ashitomi, T. Yara, M. Nakashima,
Y. Amako, M. Hedo, T. Nakama and Y. Onuki, J. Phys. Soc. Jpn. 90, 034709(1-15) (2021).
22. †*Spin Excitations of the S = 1/2 One-Dimensional Ising-Like Antiferromagnet BaCo2V2O8 in Transverse Magnetic
Fields: A. Okutani, H. Onishi, S. Kimura, T. Takeuchi, T. Kida, M. Mori, A. Miyake, M. Tokunaga, K. Kindo and
M. Hagiwara, J. Phys. Soc. Jpn. 90, 044704/1-9 (2021).
23. †*Geometrical Hall effect and momentum-space Berry curvature from spin-reversed band pairs: M. Hirschberger,
Y. Nomura, H. Mitamura, A. Miyake, T. Koretsune, Y. Kaneko, L. Spitz, Y. Taguchi, A. Matsuo, K. Kindo, R. Arita,
M. Tokunaga and Y. Tokura, Phys. Rev. B 103, L041111(1-6) (2021).
24. Symmetry change of d-wave superconductivity in κ-type organic superconductors: S. Imajo, K. Kindo and
Y. Nakazawa, Phys. Rev. B 103, L060508(1-5) (2021).
25. *Compact megajoule-class pulsed power supply for generating long-pulsed magnetic fields: K. Matsui, T. Kanda,
Y. Ihara, K. Kindo and Y. Kohama, Review of Scientific Instruments 92, 024711 (2021).
26. *High-resolution calorimetry in pulsed magnetic fields: S. Imajo, C. Dong, A. Matsuo, K. Kindo and Y. Kohama,
Review of Scientific Instruments 92, 043901 (2021).

Tokunaga group
In this year, we have developed or improved several measurements in high magnetic fields. Using fast capacitance measurements, we have achieved high-precision measurements of magnetostriction, dielectric constants, and magnetocaloric effects inpulsed-high magnetic fields. We utilize polarizing microscopy to visualize domain structures in CeSb and Cd2Re2O7 and study
the dynamics of superconducting vortices and field-induced structural transitions in metamagnetic shape memory alloys using
a high-speed camera. Utilizing various measurement techniques, we studied magnetic field-induced phase transitions in several
heavy fermion and multiferroic materials and magnetotransport properties of topological semimetals. In elemental tellurium, asemiconductor with a chiral crystal structure, our high-field magnetotransport study revealed the existence of metallic states on
the as-cleavage surfaces of single crystals.
1.

*105Pd NMR and NQR study of the cubic heavy fermion system Ce Pd Si : I. Jakovac, M. Horvatic, E. F. Schwier,
3 20 6* Joint research among groups within ISSP.

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A. Prokofiev, S. Paschen, H. Mitamura, T. Sakakibara and M. S. Grbic, J. Phys.: Condens. Matter 32, 245601(1-7)(2020).
2.

*Domain Control by Adjusting Anisotropic Stress in Pyrochlore Oxide Cd Re O : S. Tajima, D. Hirai, Y. Kinoshita,
2 2 7

3.

†*Bulk quantum Hall effect of spin-valley coupled Dirac fermions in the polar antiferromagnet BaMnSb : H. Sakai,
24.

High-field ultrasonic study of quadrupole ordering and crystal symmetry breaking in CeRhIn5: R. Kurihara, A. Miyake,
M. Tokunaga, Y. Hirose and R. Settai, Phys. Rev. B 101, 155125/1-8 (2020).

5.

†Intriguing behavior of UCo Rh Ge ferromagnets in magnetic field along the axis: J. Pospíšil, Y. Haga, A. Miyake,
1-xx
S. Kambe, Y. Tokunaga, M. Tokunaga, E. Yamamoto, P. Proschek, J. Volný and V. Sechovský, Phys. Rev. B 102,024442/1-13 (2020).

6.

Magnetic phase diagram enriched by chemical substitution in a noncentrosymmetric helimagnet: T. Sato, Y. Araki,
A. Miyake, A. Nakao, N. Abe, M. Tokunaga, S. Kimura, Y. Tokunaga and T.-H. Arima, Phys. Rev. B 101, 054414/1-6(2020).

7.

†Magnetic structures and quadratic magnetoelectric effect in LiNiPO beyond 30 T: E. Fogh, T. Kihara, R. Toft4

8.

*Magnetotransport properties of tellurium under extreme conditions: K. Akiba, K. Kobayashi, T. C. Kobayashi,

9.

†Metamagnetic transitions and magnetoelectric responses in the chiral polar helimagnet Ni InSbO : Y. Araki, T. Sato, Y.
2
6

M. Tokunaga, K. Akiba, T. C. Kobayashi, H. T. Hirose and Z. Hiroi, J. Phys. Soc. Jpn. 89, 114711 (2020).

H. Fujimura, S. Sakuragi, M. Ochi, R. Kurihara, A. Miyake, M. Tokunaga, T. Kojima, D. Hashizume, T. Muro, K.
Kuroda, T. Kondo, T. Kida, M. Hagiwara, K. Kuroki, M. Kondo, K. Tsuruda, H. Murakawa and N. Hanasaki, Phys. Rev.
B 101, 081104/1-7 (2020).

Petersen, M. Bartkowiak, Y. Narumi, O. Prokhnenko, A. Miyake, M. Tokunaga, K. Oikawa, M. K. Sørensen, J. C.
Dyrnum, H. Grimmer, H. Nojiri and N. B. Christensen, Phys. Rev. B 101, 024403/1-12 (2020).
R. Koezuka, A. Miyake, J. Gouchi, Y. Uwatoko and M. Tokunaga, Phys. Rev. B 101, 245111(1-6) (2020).

Fujima, N. Abe, M. Tokunaga, S. Kimura, D. Morikawa, V. Ukleev, Y. Yamasaki, C. Tabata, H. Nakao, Y. Murakami, H.
Sagayama, K. Ohishi, Y. Tokunaga and T. Arima, Phys. Rev. B 102, 054409/1-8 (2020).

10. †Strong magnetic anisotropy and unusual magnetic field reinforced phase in URhSn with a quasi-kagome structure:
Y. Shimizu, A. Miyake, A. Maurya, F. Honda, A. Nakamura, Y. J. Sato, D. Li, Y. Homma, M. Yokoyama, Y. Tokunaga,
M. Tokunaga and D. Aoki, Phys. Rev. B 102, 134411/1-11 (2020).
11. *Anisotropic Fully Gapped Superconductivity Possibly Mediated by Charge Fluctuations in a Nondimeric Organic
Complex: S. Imajo, H. Akutsu, R. Kurihara, T. Yajima, Y. Kohama, M. Tokunaga, K. Kindo and Y. Nakazawa, Phys.
Rev. Lett. 125, 177002 (2020).
12. †Dynamic evolution of flux distributions in a pulse-driven superconductor by high-speed magneto-optical imaging:
H. Kurokawa, Y. Kinoshita, F. Nabeshima, M. Tokunaga and A. Maeda, Appl. Phys. Lett. 116, 262601/1-5 (2020).
13. †*Synthesis, Structure, and Anomalous Magnetic Ordering of the Spin-1/2 Coupled Square Tetramer System K(NbO)
Cu4(PO4)4: K. Kimura, D. Urushihara, T. Asaka, M. Toyoda, A. Miyake, M. Tokunaga, A. Matsuo, K. Kindo,
K. Yamauchi and T. Kimura, Inorg. Chem. 59, 10986-10995 (2020).
14. Anisotropic Quantum Transport through a Single Spin Channel in the Magnetic Semiconductor EuTiO3: K. Maruhashi,
K. S. Takahashi, M. S. Bahramy, S. Shimizu, R. Kurihara, A. Miyake, M. Tokunaga, Y. Tokura and M. Kawasaki, Adv.
Mater. 32, 1908315/1-10 (2020).
15. †High-Mobility 2D Hole Gas at a SrTiO3 Interface: L. D. Anh, S. Kaneta, M. Tokunaga, M. Seki, H. Tabata, M. Tanaka
and S. Ohya, Adv. Mater. 32, 1906003/1-7 (2020).
16. Magnetic field induced antiferromagnetic cone structure in multiferroic BiFeO3: M. Matsuda, S. E. Dissanayake,
T. Hong, Y. Ozaki, T. Ito, M. Tokunaga, X. Z. Liu, M. Bartkowiak and O. Prokhnenko, Phys. Rev. Materials 4,034412/1-6 (2020).
17. Capacitive detection of magnetostriction, dielectric constant, and magneto-caloric effects in pulsed magnetic fields:
A. Miyake, H. Mitamura, S. Kawachi, K. Kimura, T. Kimura, T. Kihara, M. Tachibana and M. Tokunaga, Review of
Scientific Instruments 91, 105103/1-9 (2020).
18. *Improved accuracy in high-frequency AC transport measurements in pulsed high magnetic fields: H. Mitamura,
R. Watanuki, E. Kampert, T. Förster, A. Matsuo, T. Onimaru, N. Onozaki, Y. Amou, K. Wakiya, K. T. Matsumoto,I. Yamamoto, K. Suzuki, S. Zherlitsyn, J. Wosnitza, M. Tokunaga, K. Kindo and T. Sakakibara, Review of Scientific
Instruments 91, 125107/1-25 (2020).
† Joint research with outside partners.

ISSP Activity Report 2020185

19. *Devil's staircase transition of the electronic structures in CeSb: K. Kuroda, Y. Arai, N. Rezaei, S. Kunisada,
S. Sakuragi, M. Alaei, Y. Kinoshita, C. Bareille, R. Noguchi, M. Nakayama, S. Akebi, M. Sakano, K. Kawaguchi,
M. Arita, S. Ideta, K. Tanaka, H. Kitazawa, K. Okazaki, M. Tokunaga, Y. Haga, S. Shin, H. S. Suzuki, R. Arita andT. Kondo, Nat Commun 11, 2888/1-9 (2020).
20. †High-field magnetization and magnetic phase diagram of metamagnetic shape memory alloys Ni50−Co Mn31.5Ga18.5(x = 9 and 9.7): T. Kihara, X. Xu, A. Miyake, Y. Kinoshita, M. Tokunaga, Y. Adachi and T. Kanomata, Scripta Materialia
181, 25-29 (2020).
21. †*Spin Excitations of the S = 1/2 One-Dimensional Ising-Like Antiferromagnet BaCo2V2O8 in Transverse Magnetic
Fields: A. Okutani, H. Onishi, S. Kimura, T. Takeuchi, T. Kida, M. Mori, A. Miyake, M. Tokunaga, K. Kindo and
M. Hagiwara, J. Phys. Soc. Jpn. 90, 044704/1-9 (2021).
22. †*Field-induced valence fluctuations in YbB12: R. Kurihara, A. Miyake, M. Tokunaga, A. Ikeda, Y. H. Matsuda,
A. Miyata, D. I. Gorbunov, T. Nomura, S. Zherlitsyn, J. Wosnitza and F. Iga, Phys. Rev. B 103, 115103 1-14 (2021).
23. †*Geometrical Hall effect and momentum-space Berry curvature from spin-reversed band pairs: M. Hirschberger,
Y. Nomura, H. Mitamura, A. Miyake, T. Koretsune, Y. Kaneko, L. Spitz, Y. Taguchi, A. Matsuo, K. Kindo, R. Arita,
M. Tokunaga and Y. Tokura, Phys. Rev. B 103, L041111(1-6) (2021).
24. †Martensitic Transformation and Metamagnetic Transition in Co-V-(Si, Al) Heusler Alloys: K. Nakamura, A. Miyake,
X. Xu, T. Omori, M. Tokunaga and R. Kainuma, Metals 11, 226/1-12 (2021).
25. †Observation of inverse magnetocaloric effect in magnetic-field-induced austenite phase of Heusler alloys
Ni50-xCoxMn31.5Ga18.5 (x = 9 and 9.7): T. Kihara, T. Roy, X. Xu, A. Miyake, M. Tsujikawa, H. Mitamura,
M. Tokunaga, Y. Adachi, T. Eto and T. Kanomata, Phys. Rev. Materials 5, 034416_1-13 (2021).
26. †Giant anomalous Hall effect from spin-chirality scattering in a chiral magnet: Y. Fujishiro, N. Kanazawa, R. Kurihara,
H. Ishizuka, T. Hori, F. S. Yasin, X. Yu, A. Tsukazaki, M. Ichikawa, M. Kawasaki, N. Nagaosa, M. Tokunaga andY. Tokura, Nat Commun 12, 317/1-6 (2021).

Y. Matsuda group
The magnetic-field-induced insulator to metal transition in W-doped VO2 has been discovered in 500 T using the electromagnetic flux compression ultrahigh magnetic field generator, The molecular orbital is destabilized by such a strong magnetic
field through the Pauli exclusion principle. This phenomenon can happen with the large spin Zeeman energy and the electronelectron correlation. In magnetic fields as high as 100 -200 T, we have investigated the magnon Bose-Einstein condensation in
TlCuCl3 and spin-state crystallization in LaCoO3. As for technical achievements, a measurement technique for electric resistivity and a method for boosting magnetic field have been developed. Also, we have proposed a combination of 100 T magnetic
fields and an intense x-ray by utilizing the single-turn coil method and the Japanese x-ray free electron laser SACLA. In
addition, cyclotron resonance in an InAs quantum well, temperature dependent magnetization process in YbB12, and magnetic
properties in Mn2V2O7 have been studied in high magnetic fields.
1.

†*Experimental measurements of effective mass in near-surface InAs quantum wells: J. Yuan, M. Hatefipour, B. A.

2.

†*Magnetization plateau observed by ultrahigh-field Faraday rotation in the kagome antiferromagnet herbertsmithite:

3.

Magill, W. Mayer, M. C. Dartiailh, K. Sardashti, K. S. Wickramasinghe, G. A. Khodaparast, Y. H. Matsuda, Y. Kohama,
Z. Yang, S. Thapa, C. J. Stanton and J. Shabani, Phys. Rev. B 101, 205310 1-8 (2020).
R. Okuma, D. Nakamura and S. Takeyama, Phys. Rev. B 102, 104429 1-4 (2020).

†Pressure and magnetic field effects on ferroelastic and antiferromagnetic orderings in honeycomb-lattice Mn V O :2 2 7

H. C. Wu, D. J. Hsieh, T. W. Yen, P. J. Sun, D. Chandrasekhar Kakarla, J. L. Her, Y. H. Matsuda, C. K. Chang, Y. C. Lai,
M. Gooch, L. Z. Deng, K. G. Webber, C. A. Lee, M. M. C. Chou, C. W. Chu and H. D. Yang, Phys. Rev. B 102, 075130
1-8 (2020).

4.

†*Quantum limit cyclotron resonance in monolayer epitaxial graphene in magnetic fields up to 560 T: The relativistic

5.

†*Particle-Hole Symmetry Breaking in a Spin-Dimer System TlCuCl Observed at 100 T: X. -G. Zhou, Y. Yao, Y. H.
3

6.

†Two Spin-State Crystallizations in LaCoO : A. Ikeda, Y. H. Matsuda and K. Sato, Phys. Rev. Lett. 125, 177202 1-6
3

7.

†The Temperature Dependence of the Magnetization Process of the Kondo Insulator YbB : Y. H. Matsuda, Y. Kakita
12electron and hole asymmetry: D. Nakamura, H. Saito, H. Hibino, K. Asano and S. Takeyama, Phys. Rev. B 101, 115420
1-5 (2020).
Matsuda, A. Ikeda, A. Matsuo, K. Kindo and H. Tanaka, Phys. Rev. Lett. 125, 267207 1-6 (2020).
(2020).

* Joint research among groups within ISSP.

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ISSP Activity Report 2020and F. Iga, Crystals 10, 26 1-7 (2020).
8.

†*Direct measurement of resistivity in destructive pulsed magnetic fields: Y. Kohama, F. Nabeshima, A. Maeda,

9.

†*Magnetic-field-induced insulator–metal transition in W-doped VO at 500 T: Y. H. Matsuda, D. Nakamura, A. Ikeda,
2
S. Takeyama, Y. Suga, H. Nakahara and Y. Muraoka, Nat Commun 11, 3591 1-7 (2020).

A. Ikeda and Y. H. Matsuda, Review of Scientific Instruments 91, 033901 1-5 (2020).

10. †*Single shot x-ray diffractometry in SACLA with pulsed magnetic fields up to 16 T: A. Ikeda, Y. H. Matsuda, X. Zhou,
T. Yajima, Y. Kubota, K. Tono and M. Yabashi, Phys. Rev. Research 2, 043175 1-6 (2020).
11. †*Field-induced valence fluctuations in YbB12: R. Kurihara, A. Miyake, M. Tokunaga, A. Ikeda, Y. H. Matsuda,
A. Miyata, D. I. Gorbunov, T. Nomura, S. Zherlitsyn, J. Wosnitza and F. Iga, Phys. Rev. B 103, 115103 1-14 (2021).
12. †*Higher magnetic-field generation by a mass-loaded single-turn coil: M. Gen, A. Ikeda, S. Kawachi, T. Shitaokoshi,
Y. H. Matsuda, Y. Kohama and T. Nomura, Review of Scientific Instruments 92, 033902 1-5 (2021).

Kohama group
In 2020, we have investigated high-field properties in many different systems, such as CeRhIn5, SrRuO3, CuInCr4S8, FeSe,
Ruby, High-Tc superconductor, and so on. We also developed the resistivity measurment technique for a research in ultra
high-magnetic fields above 100 T. The other technical developments including the super-capacitor driven pulsed magnet areunderway.
1.

†Symmetry Lowering on the Field-Induced Commensurate Phase in CeRhIn : T. Kanda, K. Arashima, Y. Hirose,52.

Electronic band structure of (111) SrRuO3 thin films: An angle-resolved photoemission spectroscopy study: H. Ryu,
Y. Ishida, B. Kim, J. R. Kim, W. J. Kim, Y. Kohama, S. Imajo, Z. Yang, W. Kyung, S. Hahn, B. Sohn, I. Song, M. Kim,
S. Huh, J. Jung, D. Kim, T. W. Noh, S. Das and C. Kim, Phys. Rev. B 102, 041102 (2020).

3.

*Enhanced spin correlations in the Bose-Einstein condensate compound Sr Cr O : T. Nomura, Y. Skourski, D. L.
3 2 8

4.

†*Experimental measurements of effective mass in near-surface InAs quantum wells: J. Yuan, M. Hatefipour, B. A.

5.

Magnetization process of the breathing pyrochlore magnet CuInCr4S8 in ultrahigh magnetic fields up to 150 T: M. Gen,Y. Okamato, M. Mori, K. Takenaka and Y. Kohama, Phys. Rev. B 101, 054434 (2020).

6.

*Observation of in-plane magnetic field induced phase transitions in FeSe: J. M. Ok, C. I. Kwon, Y. Kohama, J. S. You,

R. Settai, K. Matsui, T. Nomura, Y. Kohama and Y. Ihara, J. Phys. Soc. Jpn. 89, 094709 (2020).

Quintero-Castro, A. A. Zvyagin, A. V. Suslov, D. Gorbunov, S. Yasin, J. Wosnitza, K. Kindo, A. T. M. N. Islam, B. Lake,
Y. Kohama, S. Zherlitsyn and M. Jaime, Phys. Rev. B 102, 165144 (2020).
Magill, W. Mayer, M. C. Dartiailh, K. Sardashti, K. S. Wickramasinghe, G. A. Khodaparast, Y. H. Matsuda, Y. Kohama,
Z. Yang, S. Thapa, C. J. Stanton and J. Shabani, Phys. Rev. B 101, 205310 1-8 (2020).

S. K. Park, J.-H. Kim, Y. J. Jo, E. S. Choi, K. Kindo, W. Kang, K.-S. Kim, E. G. Moon, A. Gurevich and J. S. Kim,
Phys. Rev. B 101, 224509 (2020).

7.

*Quantum oscillations and magnetic field induced Fermi surface reconstruction in the charge density wave state of

8.

*Anisotropic Fully Gapped Superconductivity Possibly Mediated by Charge Fluctuations in a Nondimeric Organic

9.

*Observation of small Fermi pockets protected by clean CuO sheets of a high-Tc superconductor: S. Kunisada,2

A0.9Mo6O17 (A = Na, K): H. P. Zhu, M. Yang, J. Z. Ke, H. K. Zuo, T. Peng, J. F. Wang, Y. Liu, X. Xu, Y. Kohama,
K. Kindo and M. Greenblatt, Phys. Rev. B 102, 235164 (2020).
Complex: S. Imajo, H. Akutsu, R. Kurihara, T. Yajima, Y. Kohama, M. Tokunaga, K. Kindo and Y. Nakazawa, Phys.
Rev. Lett. 125, 177002 (2020).

S. Isono, Y. Kohama, S. Sakai, C. Bareille, S. Sakuragi, R. Noguchi, K. Kurokawa, K. Kuroda, Y. Ishida, S. Adachi,
R. Sekine, T. K. Kim, C. Cacho, S. Shin, T. Tohyama, K. Tokiwa and T. Kondo, Science 369, 833 (2020).

10. *Extracting the Chiral Contribution to the Negative Longitudinal Magnetoresistance in Epitaxial Pr2Ir2O7 Thin Films:
T. Ohtsuki, Z. Tian, A. Endo, M. Halim, S. Katsumoto, Y. Kohama, K. Kindo, M. Lippmaa and S. Nakatsuji, JPS Conf.
Proc. 30, 011181 (1-6) (2020).
11. Strain engineering of the magnetic multipole moments and anomalous Hall effect in pyrochlore iridate thin films: W. J.
Kim, T. Oh, J. Song, E. K. Ko, Y. Li, J. Mun, B. Kim, J. Son, Z. Yang, Y. Kohama, M. Kim, B.-J. Yang and T. W. Noh,Sci. Adv. 6, eabb1539 (2020).
12. †*Direct measurement of resistivity in destructive pulsed magnetic fields: Y. Kohama, F. Nabeshima, A. Maeda,† Joint research with outside partners.

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187

A. Ikeda and Y. H. Matsuda, Review of Scientific Instruments 91, 033901 1-5 (2020).
13. Angle dependence of Hc2 with a crossover between the orbital and paramagnetic limits: H. Matsuoka, M. Nakano,T. Shitaokoshi, Y. Wang, Y. Kashiwabara, S. Yoshida, Y. Kohama, T. Ouchi, K. Ishizaka, M. Kawasaki, T. Nojima andY. Iwasa, Phys. Rev. Research 2, 012064(R) (2020).
14. Crystal-field Paschen-Back effect on ruby in ultrahigh magnetic fields: M. Gen, T. Kanda, T. Shitaokoshi, Y. Kohama
and T. Nomura, Phys. Rev. Research 2, 033257 (2020).
15. Van der Waals SnSe2(1−x)S2x Alloys: Composition-Dependent Bowing Coefficient and Electron–Phonon Interaction:
Z. R. Kudrynskyi, X. Wang, J. Sutcliffe, M. A. Bhuiyan, Y. Fu, Z. Yang, O. Makarovsky, L. Eaves, A. Solomon, V. T.
Maslyuk, Z. D. Kovalyuk, L. Zhang and A. Patanè, Advanced Functional Materials 30, 1908092 (2020).
16. Broad Tunability of Carrier Effective Masses in Two-Dimensional Halide Perovskites: M. Dyksik, H. Duim, X. Zhu,
Z. Yang, M. Gen, Y. Kohama, S. Adjokatse, D. K. Maude, M. A. Loi, D. A. Egger, M. Baranowski and P. Plochocka,
ACS Energy Lett. 5, 3609 (2020).
17. *High-field phase diagram of Ni3V2O8 studied by specific heat and magnetocaloric effect measurements: C. Dong,
Y. Kohama, Z. Z. He, X. T. Han, K. Sato, A. Matsuo, K. Kindo, M. Yang and J. F. Wang, J. Phys.: Condens. Matter 33,
205402 (2021).
18. Emergence of Frustrated Short-Range Order above Long-Range Order in the S = 1/2 Kagome Antiferromagnet
CaCu3(OD)6Cl2・0.6D2O: Y. Ihara, K. Matsui, Y. Kohama, S. Luther, D. Opherden, J. Wosnitza, H. Kühne and H. K.
Yoshida, J. Phys. Soc. Jpn. 90, 023703 (2021).
19. Element-specific field-induced spin reorientation and tetracritical point in MnCr2S4: Sh. Yamamoto, H. Suwa,
T. Kihara, T. Nomura, Y. Kotani, T. Nakamura, Y. Skourski, S. Zherlitsyn, L. Prodan, V. Tsurkan, H. Nojiri, A. Loidl andJ. Wosnitza, Phys. Rev. B 103, L020408 (2021).
20. Wide Critical Fluctuations of the Field-Induced Phase Transition in Graphite: C. Marcenat, T. Klein, D. LeBoeuf,
A. Jaoui, G. Seyfarth, J. Kacmarcik, Y. Kohama, H. Cercellier, H. Aubin, K. Behnia and B. Fauque, Phys. Rev. Lett.
126, 106801 (2021).
21. *Compact megajoule-class pulsed power supply for generating long-pulsed magnetic fields: K. Matsui, T. Kanda,
Y. Ihara, K. Kindo and Y. Kohama, Review of Scientific Instruments 92, 024711 (2021).
22. †*Higher magnetic-field generation by a mass-loaded single-turn coil: M. Gen, A. Ikeda, S. Kawachi, T. Shitaokoshi,
Y. H. Matsuda, Y. Kohama and T. Nomura, Review of Scientific Instruments 92, 033902 1-5 (2021).
23. *High-resolution calorimetry in pulsed magnetic fields: S. Imajo, C. Dong, A. Matsuo, K. Kindo and Y. Kohama,
Review of Scientific Instruments 92, 043901 (2021).

Center of Computational Materials Science
Akai team
The main objective of is to predict/discover new functionality materials by means of computational materials design (CMD). In
particular, new high-performance permanent magnets is one of main targets. Developments of new methods of quantum simulation are also important themes. Our activities include the followings: (1) A method that enabled us to treat low energy collective excitations, phonons and magnons, in the framework of first-principles KKR-CPA was developed and applied to various
magnetic systems. The effects of these excitations on magnetization at finite temperature and the Curie temperature of typicalmagnetic systems, including bcc Fe and permanent-magnet materials B2(Fe, Co)14B, were calculated using low energy effective
Hamiltonian obtained by a first-principles KKR-Green's function method where the magnons and phonons were included in astatic and local scheme. The effects of these excitations were important in determining the magnetic properties, was concluded;(2) The magnetic Friedel oscillation near the surface of Fe films was detected layer by layer measurement using synchrotron
Mössbauer source. The behavior was well reproduced by the hyperfine interactions calculated using the full-potential KKR
method and the KKR method combined the optimized effective potential (OEP) method; (3) An efficient method to calculate
spin-wave dispersions using the low-energy effective Hamiltonian derived from first-principles calculations was developed andapplied to rare-earth based permanent magnet materials including R2(Fe, Co)14B; (4) A search for rare-earth bases permanent
magnets materials of better performance at finite temperature were made using massive data obtained as results of first-principles KKR-CPA together with fairly large number of experimental data by a newly developed data assimilation technique. The
method developed was proven powerful enough to predict possible candidates for compositions of high-performance permanent
magnet materials.
* Joint research among groups within ISSP.

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1.

Calculating Curie temperatures for rare-earth permanent magnets: Ab initio inspection of localized magnetic moments ind-electron ferromagnetism: M. Matsumoto and H. Akai, Phys. Rev. B 101, 144402 (2020).

2.

Element- and orbital-selective magnetic coherent rotation at the first-order phase transition of a hard uniaxial ferrimagnet: Sh. Yamamoto, D. I. Gorbunov, H. Akai, H. Yasumura, Y. Kotani, T. Nakamura, T. Kato, N. V. Mushnikov,
A. V. Andreev, H. Nojiri and J. Wosnitza, Phys. Rev. B 101, 174430 (2020).

3.

Magnetic Friedel Oscillation at the Fe(001) Surface: Direct Observation by Atomic-Layer-Resolved Synchrotron Radiation 57Fe Mössbauer Spectroscopy: T. Mitsui, S. Sakai, S. Li, T. Ueno, T. Watanuki, Y. Kobayashi, R. Masuda, M. Setoand H. Akai, Phys. Rev. Lett. 125, 236806 (2020).

4.

*First-principles calculations of finite temperature electronic structures and transport properties of Heusler alloy

5.

Spin-wave dispersion and exchange stiffness in Nd2Fe14B and RFe11Ti (R=Y, Nd, Sm) from first-principles calculations: T. Fukazawa, H. Akai, Y. Harashima and T. Miyake, Phys. Rev. B 103, 024418-1–7 (2021).

6.

Data assimilation method for experimental and first-principles data: Finite-temperature magnetization of (Nd, Pr, La,
Ce)2(Fe, Co, Ni)14B: Y. Harashima, K. Tamai, S. Doi, M. Matsumoto, H. Akai, N. Kawashima, M. Ito, N. Sakuma,
A. Kato, T. Shoji and T. Miyake, Phys. Rev. Materials 5, 013806-1–10 (2021).

Co2MnSi: H. Shinya, S. Kou, T. Fukushima, A. Masago, K. Sato, H. Katayama-Yoshida and H. Akai, Appl. Phys. Lett.
117, 042402(1-5) (2020).

Miyashita team
We studied temperature dependence of coercivity for permanent magnets as the activity of ESICMM. We also studied subjects
for phase transitions and quantum dynamics.
1.

Dynamical aspects of magnetization reversal in the neodymium permanent magnet by a stochastic Landau-LifshitzGilbert simulation at finite temperature: Real-time dynamics and quantitative estimation of coercive force: M. Nishino,
I. E. Uysal, T. Hinokihara and S. Miyashita, Phys. Rev. B 102, 020413(R) (1-5) (2020).

2.

Elastic-frustration-driven unusual magnetoelastic properties in a switchable core-shell spin-crossover nanostructure:
Y. Singh, H. Oubouchou, M. Nishino, S. Miyashita and K. Boukheddaden, Phys. Rev. B 101, 054105(1-15) (2020).

3.

Magnetic field threshold for nucleation and depinning of domain walls in the neodymium permanent magnet Nd2Fe14B:
I. E. Uysal, M. Nishino and S. Miyashita, Phys. Rev. B 101, 094421 (1-9) (2020).

4.

Dynamical phase transition in Floquet optical bistable systems: An approach from finite-size quantum systems:
T. Shirai, S. Todo and S. Miyashita, Phys. Rev. E 101, 013809(1-7) (2020).

5.

Magnetic-Pole Flip by Millimeter Wave: S.-I. Ohkoshi, M. Yoshikiyo, K. Imoto, K. Nakagawa, A. Namai, H. Tokoro,
Y. Yahagi, K. Takeuchi, F. Jia, S. Miyashita, M. Nakajima, H. Qiu, K. Kato, T. Yamaoka, M. Shirata, K. Naoi,
K. Yagishita and H. Doshita, Adv. Mater. 32, 2004897(1-7) (2020).

6.

Construction of quantum dark soliton in onedimensional Bose gas: E. Kaminishi, T. Mori and S. Miyashita, J. Phys. B:
At. Mol. Opt. Phys. 53, 095302(1-8) (2020).

7.

Role of atomic-scale thermal fluctuations in the coercivity: Y. Toga, S. Miyashita, A. Sakuma and T. Miyake, npj
Computational Materials 6:67, 1-7 (2020).

8.

Effect of the surface magnetic anisotropy of neodymium atoms on the coercivity in neodymium permanent magnets:
M. Nishino, I. E. Uysal and S. Miyashita, Phys. Rev. B 103, 014418(1-9) (2021).

9.

Systematic survey of magnetic configurations in multilayer ferromagnet system with dipole-dipole interaction:
T. Hinokihara and S. Miyashita, Phys. Rev. B 103, 054421(1-9) (2021).

10. Rapid Faraday Rotation on epsilon-Iron Oxide Magnetic Nanoparticles by Visible and Terahertz Pulsed Light: S.-I.
Ohkoshi, K. Imoto, A. Namai, M. Yoshikiyo, S. Miyashita, H. Qiu, S. Kimoto, K. Kato and M. Nakajima, J. Am. Chem.
Soc. 141, 1775-1780 (2021).

† Joint research with outside partners.

ISSP Activity Report 2020

189

Laser and Synchrotron Research Center
Kobayashi group
We have supplied some laser systems for applications such as astronomical science and photoemission spectroscopy. Some
results related to a laser processing were published in 2020.
1.

†Ablation threshold and crater morphology of amorphous and crystalline SiO glass for extreme ultraviolet femto22.

†Precision measurement of ablation thresholds with variable pulse duration laser: T. Takahashi, S. Tani, R. Kuroda and3.

†Study on nonthermal–thermal processing boundary in drilling of ceramics using ultrashort pulse laser system withsecond pulses: T. Shibuya, K. Sakaue, H. Ogawa, T. -H. Dinh, D. Satoh, E. Terasawa, M. Washio, M. Tanaka,
T. Higashiguchi, M. Ishino, Y. Kubota, Y. Inubushi, S. Owada, M. Nishikino, Y. Kobayashi and R. Kuroda, Jpn. J. Appl.
Phys. 59, 122004 (2020).
Y. Kobayashi, Appl. Phys. A 126, 582 (2020).

variable parameters over a wide range: A. Narazaki, H. Takada, D. Yoshitomi, K. Torizuka and Y. Kobayashi, Appl.
Phys. A 126, 252 (2020).

4. レーザーアブレーションの学理解明と次世代レーザー加工に向けた自動計測技術開発 : 小林 洋平 , 高橋 孝 , 谷峻 太郎 ,応用物理 , Vol.89, No.12, 719-723 (2020).
5.

Q-switching stability limits of Kerr-lens mode locking: S. Kimura, S. Tani and Y. Kobayashi, Phys. Rev. A 102, 043505(2020).

6.

Neural-network-assisted in situ processing monitoring by speckle pattern observation: S. Tani, Y. Aoyagi and
Y. Kobayashi, Opt. Express 28, 26180 (2020).

7.

Piezo-electric transducer actuated mirror with a servo bandwidth beyond 500 kHz: T. Nakamura, S. Tani, I. Ito, M. Endoand Y. Kobayashi, Opt. Express 28, 16118 (2020).

8.

†Work function seen with sub-meV precision through laser photoemission: Y. Ishida, J. K. Jung, M. S. Kim, J. Kwon,

9.

Subgigahertz-resolution table-top spectrograph calibrated with a 4-GHz optical frequency comb: M. Endo,T. Sukegawa, A. Silva and Y. Kobayashi, J. Astron. Telesc. Instrum. Syst. 6, 1 (2020).

Y. S. Kim, D. Chung, I. Song, C. Kim, T. Otsu and Y. Kobayashi, Commun Phys 3, 158 (2020).

10. †Ablation thresholds and morphological changes of poly-L-lactic acid for pulse durations in the femtosecond-topicosecond regime: T. Shibuya, D. Yoshitomi, D. Satoh, K. Sakaue, M. Tanaka, H. Takada, H. Ogawa, K. Torizuka,
Y. Kobayashi and R. Kuroda, Surf Interface Anal 52, 1145 (2020).
11. 固体レーザーによる光周波数コム : 小林 洋平 , 木村 祥太 , 電子情報通信学会誌 , Vol.103, No.11, 1082, 1088 (2020).
12. *Direct generation of sub-picosecond pulse via multi-section gain switching: T. Nakamura, T. Ito, H. Nakamae, C. Kim,
Y. Hazama, Y. Kobayashi, R. Kuroda and H. Akiyama, Opt. Lett. 46, 1277 (2021).
13. Coherent control of acoustic phonons in a silica fiber using a multi-GHz optical frequency comb: M. Endo, S. Kimura,
S. Tani and Y. Kobayashi, Commun Phys 4, 73 (2021).
14. †Ultrafast laser processing of ceramics: Comprehensive survey of laser parameters: A. Narazaki, H. Takada, D. Yoshitomi, K. Torizuka and Y. Kobayashi, Journal of Laser Applications 33, 012009 (2021).

Harada group
This year, in order to tackle the new coronavirus problem, we analyzed water treatment membranes that can be used as virus
removal membranes as part of the project to analyze the solid-liquid interface, which is the main theme of Grant-in-Aid for
Scientific Research on Innovative Areas "Aquatic Functional Materials". With the support of the AMED project "Developmentof Technology for Countermeasures against Infectious Diseases including Viruses," we also promoted research and developmenton the improvement of coating materials for the inner wall of the tubes for Extra Corporeal Membrane Oxygenation (ECMO),
which is mainly used in the treatment of patients with severe pneumonia. In order to develop cathode materials that contributeto the high performance of lithium-ion batteries, we analyzed materials in which the ligand oxygen, rather than transition
metals, is involved in the redox reaction. We succeeded in capturing the dimerization of oxygen atoms interacting with metals
under high potentials using RIXS.
1.

†Revisiting the Phase Diagram of T*-type La
1−x/2Eu1−x/2SrxCuO4 Using Oxygen K-edge X-ray Absorption Spectroscopy: S. Asano, K. Ishii, K. Yamagami, J. Miyawaki, Y. Harada and M. Fujita, J. Phys. Soc. Jpn. 89, 075002 (1-2)* Joint research among groups within ISSP.

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(2020).
2.

†*Localized character of charge excitations for La
2−xSrxNiO4+δ revealed by oxygen K-edge resonant inelastic x-ray

3.

†Anisotropic X-Ray Scattering of Transiently Oriented Water: K. H. Kim, A. Späh, H. Pathak, C. Yang, S. Bonetti, K.

4.

†Ion Selectivity of Water Molecules in Subnanoporous Liquid-Crystalline Water-Treatment Membranes: A Structural

5.

†Tetragonal Distortion of a BaTiO /Bi Na TiO Nanocomposite Responsible for Anomalous Piezoelectric and Ferro3
0.5
0.5
3

6.

†Multiorbital bond formation for stable oxygen-redox reaction in battery electrodes: T. Sudayama, K. Uehara, T. Mukai,

scattering: K. Yamagami, K. Ishii, Y. Hirata, K. Ikeda, J. Miyawaki, Y. Harada, M. Miyazaki, S. Asano, M. Fujita andH. Wadati, Phys. Rev. B 102, 165145 (1-7) (2020).
Amann-Winkel, D. Mariedahl, D. Schlesinger, J. A. Sellberg, D. Mendez, G. van der Schot, H. Y. Hwang, J. Clark, O.
Shigeki, T. Tadashi, Y. Harada, H. Ogasawara, T. Katayama, A. Nilsson and F. Perakis, Phys. Rev. Lett. 125, 076002(1-6) (2020).
Study of Hydrogen Bonding: R. Watanabe, T. Sakamoto, K. Yamazoe, J. Miyawaki, T. Kato and Y. Harada, Angew.
Chem. Int. Ed. 59, 23461-23465 (2020).

electric Behaviors: W. Zhang, Q. Feng, E. Hosono, D. Asakura, J. Miyawaki and Y. Harada, ACS Omega 5, 2280022807 (2020).

D. Asakura, X.-M. Shi, A. Tsuchimoto, B. M. D. Boisse, T. Shimada, E. Watanabe, Y. Harada, M. Nakayama, M. Okubo
and A. Yamada, Energy Environ. Sci. 13, 1492-1500 (2020).

I. Matsuda group
Since the beginning of the year 2020, there has been a serious coronavirus (COVID-19) pandemic over the world and carehas been urgently needed for those affected. In living, we have had to stop the spread of the virus by avoiding three Cs: closed
spaces, crowded places, and close contact. No exception has been applied for experiments in any facilities or laboratories,
including our beamline, SPring-8 BL07LSU. A number of the user-group members and visiting itself have been restricted. After
summer, beamtime experiments were carried out normally for domestic users. We have made advanced X-ray magneto-opticalexperiments of exotic quantum phases and ambient pressure photoemission measurements on surface reactions. In the laboratory, soft X-ray non-linear optical research was made at X-ray free electron laser facility at SACLA.
1.

Topological Dirac nodal loops in nonsymmorphic hydrogenated monolayer boron: N. T. Cuong, I. Tateishi, M. Cameau,
M. Niibe, N. Umezawa, B. Slater, K. Yubuta, T. Kondo, M. Ogata, S. Okada and I. Matsuda, Phys. Rev. B 101, 195412(2020).

2.

Two-dimensional conducting layer on SrTiO3 surface induced by hydrogenation: Y. Takeuchi, R. Hobara, R. Akiyama,
A. Takayama, S. Ichinokura, R. Yukawa, I. Matsuda and S. Hasegawa, Phys. Rev. B 101, 085422-1,-6 (2020).

3.

†Time-resolved X-ray photoelectron diffraction using an angle-resolved time-of-flight electron analyzer: A. K. R. Ang,

4.

*Element-selectively tracking ultrafast demagnetization process in Co/Pt multilayer thin films by the resonant magneto-

Y. Fukatsu, K. Kimura, Y. Yamamoto, T. Yonezawa, H. Nitta, A. Fleurence, S. Yamamoto, I. Matsuda, Y. YamadaTakamura and K. Hayashi, Jpn. J. Appl. Phys. 59, 100902 (2020).
optical Kerr effect: K. Yamamoto, S. E. Moussaoui, Y. Hirata, S. Yamamoto, Y. Kubota, S. Owada, M. Yabashi, T. Seki,
K. Takanashi, I. Matsuda and H. Wadati, Appl. Phys. Lett. 116, 172406-1,-5 (2020).

5.

Scanning magneto-optical Kerr effect (MOKE) measurement with element-selectivity by using a soft x-ray freeelectron laser and an ellipsoidal mirror: Y. Kubota, H. Motoyama, G. Yamaguchi, S. Egawa, Y. Takeo, M. Mizuguchi,
H. Sharma, S. Owada, K. Tono, H. Mimura, I. Matsuda and M. Yabashi, Appl. Phys. Lett. 117, 042405 (2020).

6.

*A computational examination of the electric-field-induced proton transfer along the interface hydrogen bond between

7.

分割型アンジェレータを用いた新しい軟 X 線磁気光学法と次世代光源への展開 : 久保田 雄也 , 松田 巌 , 放射光 33,

8.

†*Atomistic-Level Description of GaN/Water Interface by a Combined Spectroscopic and First-Principles Computational Approach: M. Sato, Y. Imazeki, T. Takeda, M. Kobayashi, S. Yamamoto, I. Matsuda, J. Yoshinobu, Y. Nakano and
M. Sugiyama, J. Phys. Chem. C 124, 12466 (2020).

9.

*Edge-state correlation accelerates metal-insulator transition in topological semimetal nanofilms: S. Ito, M. Arita,

proton donating and accepting self-assembled monolayers: Y. Kanematsu, H. S. Kato, S. Yoshimoto, A. Ueda,
S. Yamamoto, H. Mori, J. Yoshinobu, I. Matsuda and M. Tachikawa, Chem. Phys. Lett. 741, 137091 (2020).
206-212 (2020).

J. Haruyama, B. Feng, W. -C. Chen, H. Namatame, M. Taniguchi, C. -M. Cheng, G. Bian, S. -J. Tang, T. -C. Chiang,
O. Sugino, F. Komori and I. Matsuda, Science Advances 6, eaaz5015 (7 pages) (2020).
† Joint research with outside partners.

ISSP Activity Report 2020191

10. *Electronic structure of a (3×3)-ordered silicon layer on Al(111): Y. Sato, Y. Fukaya, M. Cameau, A. K. Kundu,
D. Shiga, R. Yukawa, K. Horiba, C.-H. Chen, A. Huang, H.-T. Jeng, T. Ozaki, H. Kumigashira, M. Niibe and
I. Matsuda, Phys. Rev. Materials 4, 064005 (2020).
11. Ellipsometer Equipped with Multiple Mirrors for Element-selective Soft X-ray Experiments: M. Araki, J. Meikaku,
Y. Kubota, J. Miyawaki, Y. Kosegawa, S. E. Moussaoui, T. Bouillaud, P. Manset, S. Owada, K. Tono, M. Yabashi and
I. Matsuda, e-J. Surf. Sci. Nanotechnol. 18, 231 (2020).
12. Geometrical Frustration of B-H Bonds in Layered Hydrogen Borides Accessible by Soft Chemistry: S. Tominaka,
R. Ishibiki, A. Fujino, K. Kawakami, K. Ohara, I. Matsuda, H. Hosono and T. Kondo, Chem 6, 406-418 (2020).
13. Recent progresses in spectroscopies using soft X-ray free-electron laser: I. Matsuda and Y. Kubota, Chem. Lett.
Advanced publication, cl.200881 (2021).
14. †*Femtosecond Charge Density Modulations in Photoexcited CuWO4: Y. Uemura, A. S. M. Ismail, S. H. Park,
S. Kwon, M. Kim, Y. Niwa, H. Wadati, H. Elnaggar, F. Frati, T. Haarman, N. Höppel, N. Huse, Y. Hirata, Y. Zhang,
K. Yamagami, S. Yamamoto, I. Matsuda, T. Katayama, T. Togashi, S. Owada, M. Yabashi, U. Halisdemir, G. Koster,T. Yokoyama, B. M. Weckhuysen and F. M. F. D. Groot, J. Phys. Chem. C 125, 7329 (2021).
15. †Valence Fluctuations in Yb(Al,Fe)B4 Studied by Nanosecond-time-resolved Photoemission Spectroscopy Using
Synchrotron Radiation: M. Okawa, K. Akikubo, S. Yamamoto, I. Matsuda and T. Saitoh, e-J. Surf. Sci. Nanotechnol. 19,
20 (2021).

Itatani group
We mainly worked on soft-X-ray attosecond spectroscopy and the upgrade of the attosecond beamline. First, we extended thenitrogen K-edge experiments from diatomic molecules (NO) to triatomic molecules (N2O) and observed intriguing dynamicsof 2ω oscillation. The interpretation of this ultrafast oscillation is underway. Second, a new sample-feeding system for organic
molecules was introduced. We successfully measured static absorption spectra of benzene, acetone, ethanol, and methanol at
the carbon K edge around 280 eV. Third, a new soft X-ray spectrometer was developed and installed to improve the energy
resolution. In addition, we started to develop new infrastructures in the building E. We constructed a beamline booth next tothe existing laser booth, with a clean and temperature-stable environment for ultrafast experiments using EUV and soft-X-ray
pulses. A Ti:sapphire laser system was developed as a pump source for an ultrashort-pulse infrared optical parametric chirped
pulse amplifier (OPCPA), or as a driver to produce high-flux femtosecond EUV pulses for imaging experiments. We also
developed prototype light sources such as a mid-infrared optical parametric amplifier (OPA) and a harmonic-based tunable UV
source, both of which are pumped by a high-repetition-rate Yb laser.
1.

†*Photoinduced Phase Transition from Excitonic Insulator to Semimetal-like State in Ta Ni
2 1−xCoxSe5(x = 0.10):2.

†Detecting

3.

*Efficient Terahertz Harmonic Generation with Coherent Acceleration of Electrons in the Dirac Semimetal Cd As :3 2

4.

軟 X 線領域でのアト秒分光 : 斎藤 成之 , 光学 49, 249 (2020).

5.

中赤外光パルスを用いた固体高次高調波発生とその偏光特性 : 石井 順久 , 金島 圭佑 , 夏 沛宇 , 斎藤 成之 , 金井 輝人 ,板谷 治郎 , レーザー研究 49, 168-173 (2020).

6.

†Role of virtual band population for high harmonic generation in solids: Y. Sanari, H. Hirori, T. Aharen, H. Tahara,

7.

†Observation of the quantum shift of a backward rescattering caustic by carrier-envelope phase mapping: T. Mizuno,

8.

*Optical parametric amplification of phase-stable terahertz-to-mid-infrared pulses studied in the time domain: N. Kanda,

9.

†Time-domain spectroscopy of optical parametric amplification for phase-stable terahertz-to-midinfrared pulses:

T. Mitsuoka, T. Suzuki, H. Takagi, N. Katayama, H. Sawa, M. Nohara, M. Watanabe, J. Xu, Q. Ren, M. Fujisawa,T. Kanai, J. Itatani, S. Shin, K. Okazaki and T. Mizokawa, J. Phys. Soc. Jpn. 89, 124703 (2020).
electron-phonon coupling during photoinduced phase transition,: T. Suzuki, Y. Shinohara, Y. Lu,
M. Watanabe, J. Xu, K. L. Ishikawa, H. Takagi, M. Nohara, N. Katayama, H. Sawa, M. Fujisawa, T. Kanai, J. Itatani,
T. Mizokawa, S. Shin and K. Okazaki, Phys. Rev. B 103, L121105 (2020).
B. Cheng, N. Kanda, T. N. Ikeda, T. Matsuda, P. Xia, T. Schumann, S. Stemmer, J. Itatani, N. P. Armitage and R. Matsunaga, Phys. Rev. Lett. 124, 117402 (2020).

Y. Shinohara, K. L. Ishikawa, T. Otobe, P. Xia, N. Ishii, J. Itatani, S. A. Sato and Y. Kanemitsu, Phys. Rev. B (Rapid
Communication) 102, 041125(R)-1-7 (2020).

N. Ishii, T. Kanai, P. Rosenberger, D. Zietlow, M. F. Kling, O. I. Tolstikhin, T. Morishita and J. Itatani, Phys. Rev. A 103,
043121 (2021).
N. Ishii, J. Itatani and R. Matsunaga, Optics Express 29, 3479-3489 (2021).

* Joint research among groups within ISSP.

192

ISSP Activity Report 2020

N. Kanda, N. Ishii, J. Itatani and R. Matsunaga, Optics Express 29(3), 3479-3489 (2021).

Kondo group
We use angle-resolved photoemission spectroscopy (ARPES) with ultrahigh energy resolution. The main findings in 2020 were
small pockets in cuprate, Devil's staircase in CeSb, and spin-polarized band in Te.
1.

†*Bulk quantum Hall effect of spin-valley coupled Dirac fermions in the polar antiferromagnet BaMnSb2: H. Sakai,

2.

Three-dimensional electronic structure in ferromagnetic Fe3Sn2 with breathing kagome bilayers: H. Tanaka,
Y. Fujisawa, K. Kuroda, R. Noguchi, S. Sakuragi, C. Bareille, B. Smith, C. Cacho, S. W. Jung, T. Muro, Y. Okada andT. Kondo, Phys. Rev. B 101, 161114 (2020).

3.

*Radial Spin Texture in Elemental Tellurium with Chiral Crystal Structure: M. Sakano, M. Hirayama, T. Takahashi,

4.

*Observation of small Fermi pockets protected by clean CuO sheets of a high-Tc superconductor: S. Kunisada,
2

5.

*Devil's staircase transition of the electronic structures in CeSb: K. Kuroda, Y. Arai, N. Rezaei, S. Kunisada,

6.

*Observation and control of the weak topological insulator state in ZrTe : P. Zhang, R. Noguchi, K. Kuroda, C. Lin, K.
5

H. Fujimura, S. Sakuragi, M. Ochi, R. Kurihara, A. Miyake, M. Tokunaga, T. Kojima, D. Hashizume, T. Muro,
K. Kuroda, T. Kondo, T. Kida, M. Hagiwara, K. Kuroki, M. Kondo, K. Tsuruda, H. Murakawa and N. Hanasaki, Phys.
Rev. B 101, 081104/1-7 (2020).

S. Akebi, M. Nakayama, K. Kuroda, K. Taguchi, T. Yoshikawa, K. Miyamoto, T. Okuda, K. Ono, H. Kumigashira,T. Ideue, Y. Iwasa, N. Mitsuishi, K. Ishizaka, S. Shin, T. Miyake, S. Murakami, T. Sasagawa and T. Kondo, Phys. Rev.
Lett. 124, 136404 (2020).
S. Isono, Y. Kohama, S. Sakai, C. Bareille, S. Sakuragi, R. Noguchi, K. Kurokawa, K. Kuroda, Y. Ishida, S. Adachi,
R. Sekine, T. K. Kim, C. Cacho, S. Shin, T. Tohyama, K. Tokiwa and T. Kondo, Science 369, 833 (2020).
S. Sakuragi, M. Alaei, Y. Kinoshita, C. Bareille, R. Noguchi, M. Nakayama, S. Akebi, M. Sakano, K. Kawaguchi,
M. Arita, S. Ideta, K. Tanaka, H. Kitazawa, K. Okazaki, M. Tokunaga, Y. Haga, S. Shin, H. S. Suzuki, R. Arita andT. Kondo, Nat Commun 11, 2888/1-9 (2020).
Kawaguchi, K. Yaji, A. Harasawa, M. Lippmaa, S. Nie, H. Weng, V. Kandyba, A. Giampietri, A. Barinov, Q. Li, G. D.
Gu, S. Shin and T. Kondo, Nat. Commun. 12, 406 (2021).

Matsunaga group
We have investigated light-matter interactions and light-induced nonequilibrium phenomena in solids by utilizing terahertz(THz) pulse. We have studied nonlinear THz responses and nonequilibrium dynamics of carries in Dirac and Weyl semimetals.
We have also developed optical parametric amplification of low-frequency infrared pulses in the intermediate region between
THz frequency and mid-infrared, 167., from 16.9 to 44.8 THz (6.7–17.8 μm) based on the intra-pulse differential frequency
generation in GaSe. The long-term phase drift of the THz-to-MIR pulses after two-stage OPA is as small as 16 mrad during a
6-h operation without any active feedback. Our scheme using the intra-pulse DFG and post-amplification proposes a new route
to intense THz-to-MIR light sources with extreme phase stability.
1.

*Efficient Terahertz Harmonic Generation with Coherent Acceleration of Electrons in the Dirac Semimetal Cd As :3 2

2.

*Room-temperature terahertz anomalous Hall effect in Weyl antiferromagnet Mn Sn thin films: T. Matsuda, N. Kanda,
33.

Opening a new route to multiport coherent XUV sources via intracavity high-order harmonic generation: N. Kanda,
T. Imahoko, K. Yoshida, A. Tanabashi, A. Amani Eilanlou, Y. Nabekawa, T. Sumiyoshi, M. Kuwata-Gonokami and
K. Midorikawa, Light: Sci. Appl. 9, 168 (2020).

4.

*Optical parametric amplification of phase-stable terahertz-to-mid-infrared pulses studied in the time domain: N. Kanda,

B. Cheng, N. Kanda, T. N. Ikeda, T. Matsuda, P. Xia, T. Schumann, S. Stemmer, J. Itatani, N. P. Armitage and R. Matsunaga, Phys. Rev. Lett. 124, 117402 (2020).
T. Higo, N. P. Armitage, S. Nakatsuji and R. Matsunaga, Nat Commun 11, 909 (2020).

N. Ishii, J. Itatani and R. Matsunaga, Optics Express 29, 3479-3489 (2021).

Okazaki group
We have investigated superconducting-gap structures of unconventional superconductors by a low-temperature and highresolution laser ARPES apparatus and transient electronic structures in photo-excited non-equilibrium states by a time-resolved
ARPES apparatus using EUV and SX lasers. In the academic year 2020, we have found that Bose–Einstein condensation (BEC)
superconductivity is induced by disappearance of the nematic state in FeSe by high-resolution laser ARPES. In addition, we† Joint research with outside partners.

ISSP Activity Report 2020193

have revealed a characteristic electron-phonon coupling during the photo-induced insulator-to-metal transition in Ta2NiSe5 by
a newly developed analysis method, frequency-domain angle-resolved photoemission spectroscopy (FDARPES), based on themeasurements of HHG laser time-resolved ARPES.
1.

†*Photoinduced Phase Transition from Excitonic Insulator to Semimetal-like State in Ta Ni
2 1−xCoxSe5(x = 0.10):

2.

Massive Suppression of Proximity Pairing in Topological (Bi1-xSbx)2Te3 Films on Niobium: J. A. Hlevyack,S. Najafzadeh, M. -K. Lin, T. Hashimoto, T. Nagashima, A. Tsuzuki, A. Fukushima, C. Bareille, Y. Bai, P. Chen, R. -Y.
Liu, Y. Li, D. Fl"ototto, J. Avila, J. N. Eckstein, S. Shin, K. Okazaki and T. -C. Chiang, Phys. Rev. Lett. 124, 236402(2020).

3.

Bose-Einstein condensation superconductivity induced by disappearance of the nematic state: T. Hashimoto, Y. Ota,
A. Tsuzuki, T. Nagashima, A. Fukushima, S. Kasahara, Y. Matsuda, K. Matsuura, Y. Mizukami, T. Shibauchi, S. Shinand K. Okazaki, Sci. Adv. 6, eabb9052 (2020).

4.

*Devil's staircase transition of the electronic structures in CeSb: K. Kuroda, Y. Arai, N. Rezaei, S. Kunisada,

5.

*Detecting

T. Mitsuoka, T. Suzuki, H. Takagi, N. Katayama, H. Sawa, M. Nohara, M. Watanabe, J. Xu, Q. Ren, M. Fujisawa,T. Kanai, J. Itatani, S. Shin, K. Okazaki and T. Mizokawa, J. Phys. Soc. Jpn. 89, 124703 (2020).

S. Sakuragi, M. Alaei, Y. Kinoshita, C. Bareille, R. Noguchi, M. Nakayama, S. Akebi, M. Sakano, K. Kawaguchi,
M. Arita, S. Ideta, K. Tanaka, H. Kitazawa, K. Okazaki, M. Tokunaga, Y. Haga, S. Shin, H. S. Suzuki, R. Arita andT. Kondo, Nat Commun 11, 2888/1-9 (2020).
electron-phonon coupling during photoinduced phase transition: T. Suzuki, Y. Shinohara, Y. Lu,
M. Watanabe, J. Xu, K. L. Ishikawa, H. Takagi, M. Nohara, N. Katayama, H. Sawa, M. Fujisawa, T. Kanai, J. Itatani,
T. Mizokawa, S. Shin and K. Okazaki, Phys. Rev. B 103, L121105 (2021).

Kimura group
Kimura group started in July 2020, and our group works on developing new microscopic imaging technologies using advanced
X-ray sources: X-ray free-electron lasers, synchrotron radiation, and high-order harmonics of ultrashort infrared laser pulses. In
2020, we developed a new X-ray microscopic imaging system at BL25SU of SPring-8 and BL1 of SACLA. We designed andfabricated novel X-ray optical components, such as focusing mirror and microfluidic device, by utilizing ultra-precision fabrication, measurement techniques, and semiconductor manufacturing processes.
1.

Chi-Feng Huang, Wei-Hau Chang, Ting-Kuo Lee, Yasumasa Joti, Yoshinori Nishino, Takashi Kimura, Akihiro Suzuki,
Yoshitaka Bessho, Tsung-Tse Lee, Mei-Chun Chen, Shun-Min Yang, Yeukuang Hwu, Shih-Hsin Huang, Po-Nan Li,
Peilin Chen, Yung-Chieh Tseng, Che Ma, Tsui-Ling Hsu, Chi-Huey Wong, Kensuke Tono, Tetsuya Ishikawa, and Keng
S. Liang: C.-F. Huang, W.-H. Chang, T.-K. Lee, Y. Joti, Y. Nishino, T. Kimura, A. Suzuki, Y. Bessho, T.-T. Lee, M.-C.
Chen, S.-M. Yang, Y. Hwu, S.-H. Huang, P.-N. Li, P. Chen, Y.-C. Tseng, C. Ma, T.-L. Hsu, C.-H. Wong, K. Tono,
T. Ishikawa and K. S. Liang, AIP Advances 10, 055219 (2020).

2.

Micro-liquid enclosure array and its semi-automated assembling system for x-ray free-electron laser diffractive imagingof samples in solution: T. Kimura, A. Suzuki, Y. Yang, Y. Niida, A. Nishioka, M. Takei, J. Wei, H. Mitomo, Y. Matsuo,
K. Niikura, K. Ijiro, K. Tono, M. Yabashi, T. Ishikawa, T. Oshima, Y. Bessho, Y. Joti and Y. Nishino, Review of Scientific Instruments 91, 083706 (2020).

3.

A highly efficient nanofocusing system for soft x rays: Y. Takeo, H. Motoyama, T. Shimamura, T. Kimura, T. Kume,
Y. Matsuzawa, T. Saito, Y. Imamura, H. Miyashita, K. Hiraguri, H. Hashizume, Y. Senba, H. Kishimoto, H. Ohashi and
H. Mimura, Applied Physics Letters 117, 151104 (2020).

4.

Design of two-stage soft-X-ray nano-focusing system with a ring-focusing mirror and quasi-Wolter mirror: Y. Takeo,
H. Motoyama, T. Shimamura, T. Kimura, T. Kume, Y. Matsuzawa, T. Saito, Y. Imamura, H. Miyashita, K. Hiraguri,
H. Hashizume, Y. Senba, H. Kishimoto, H. Ohashi and H. Mimura, in: PROCEEDINGS OF SPIE (SPIE, 2020),
114920N.

5.

Design of ultrashort Kirkpatrick-Baez mirror for soft x-ray nanofocusing: T. Shimamura, Y. Takeo, T. Kimura, H. Hashizume, Y. Senba, H. Kishimoto, H. Ohashi and H. Mimura, in: PROCEEDINGS OF SPIE (SPIE, 2020), 114920P.

* Joint research among groups within ISSP.

194

ISSP Activity Report 2020

The Institute for Solid State Physics (ISSP), The University of Tokyo
Address

5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, JapanPhone+81-4-7136-3207

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ISSP Activity Report 2020195