Magnetic properties of S = 5/2 triangular lattice dimer Cs3 Fe2 Cl9
1

Y. Ishii, 2 Y. Matsushita, 1 H. Yoshida, 1 M. Oda,
3
A. Takata, 3 T. Kida, 3 Y. Narumi, and 3 M. Hagiwara.
1

Hokkaido Univ., 2 NIMS, 3 AHMF, Osaka Univ.

Cs3 Fe2 Cl9 is one of the members of A3 M 2 X 9 (A = Cs, Rb ; M = Ti, V, Cr, Fe ; X =Cl, Br, I) series compounds. The crystal structure consists of triangular lattice of (Fe2 Cl9 )3−
dimers. Three dominant magnetic interactions, an intra-dimer interaction J0 , and inter-dimer
interactions Jp , Jc are considered in this system[1] . These competing interactions often evoke
exotic phenomena.
We succeeded in synthesizing single crystals of Cs3 Fe2 Cl9 by hydrothermal synthesis andmeasured the magnetic properties and the heat capacity on the single crystal. In the previous
reports, the magnetic susceptibility of the powder sample showed no magnetic order[2] . However,
our magnetic and heat capacity measurements on the single crystal revealed that Cs3 Fe2 Cl9 exhibited an antiferromagnetic long-range order at TN = 5.3 K under zero magnetic field. Unlike anormal antiferromagnetic transition, the easy-axis magnetic susceptibility showed a sudden dropat TN and then it decreased toward zero with T-linear temperature dependence. In addition,
metamagnetic transitions and successive magnetic phase transitions were observed in our experiments.
We estimated the interactions J0 = -2.4 K, J1 = (Jp + Jc ) = -1.2 K from fitting by thesusceptibility of weak coupled dimer model. The comparable and competing intra-dimer andinter-dimer magnetic interactions on the triangular lattice dimer give rise to the interesting
magnetism under magnetic fields.

(a)

M 3+

(b)

X-

Jp
Jc

J0
A+
Jp b

c
a

a

b

c

Fig. 1: A perspective view of the crystal structure of A3 M2 X9 (a) and the view along the c axis(b).

References[1] B Leuenberger and Hans U. Güdel, Journal of Solid State Chemistry, 64, 90-101 (1986).
[2] A. P. Ginsberg and M. B. Robin, Inorg. Chem., 2, 817-822 (1963).

1

Muon Spin Relaxation Study on the Magnetic Order of
π-electrons in the Cesium and Sodium Superoxide
Fahmi Astuti1,2, Dita P. Sari1,3, Retno Asih1,3, Greame Blake4, Takashi Kambe5, Mizuki
Miyajima5, Takeshi Kakuto5, Takehito Nakano3, Yasuo Nozue3, and Isao Watanabe1,2,3
RIKEN Nishina Center1, Hokkaido University2, Osaka University3,
University of Groningen4, Okayama University5

Alkali metal superoxides (AO2) are one of ideal model systems to investigate
the π-electron magnetism. The KO2 and RbO2 systems exhibit theantiferromagnetic (AF) order at temperature of 7 K and 15 K, respectively.
Meanwhile, CsO2 and NaO2 have been less studied due to the difficulty insynthesizing samples. All AO2 compounds undergo structural distortions
splitting the degeneracy of * orbitals causing an magnetic ordered state, so thata magnetically ordered state is expected to appear below in CsO2 as well [1,2].
In the case of NaO2, very little is known about spin states at low temperauress
while a 1D AF spin chain has again been predicted to form [3].
We have carried out longitudinal field (LF) and zero field (ZF) by using
muon-spin-relaxation (SR) measurements on CsO2 and NaO2 at the RIKENRAL Muon Facility in the UK and at the Paul Scherrer Institut (PSI) in
Switzerland in order to investigate the magnetic properties of these superoxides.
Figure 1 shows the μSR time spectrum of CsO2 in the ZF condition. The
appearance of the spontaneous muon-spin precession was observed at 9K
indicating the formation of a magnetically ordered state. With further decreasing
temperature below 10K, the frequency of muon spin precession became larger
indicating the growth of internal fields at muon sites. At this moment, we did
not observe any strong signs of the appearance of the magnetic order in NaO2
down to 0.3K.
Figure 1: SR time spectrum of CsO2 measured in
the zero-field condition at various temperatures.
References[1] M. Klanjsek, et al.: Phys. Rev. Lett. 115,
057205 (2015).
[2] S. Riyadi, et al.: Phys. Rev. Lett. 108,
217206(2012).
[3] I. Solovyev, et al.: Cryst. Eng. Commn. 16,
522 (2014).

The electronic properties of graphene on SiC
and SrTiO3 substrates
Jinwoong Hwang1, Hye-Jin Ryu2,3, Debin Wang4, Jonathan Denlinger2, Yuegang
Zhang4, Alessandra Lanzara5, Sung-Kwan Mo2, and Choongyu Hwang1,†
1

Department of Physics, Pusan National University, Busan 46241, Korea
Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA
94709, USA
3
Max Plank POSTECH Center for Complex Phase Materials, Pohang University of
Science and Technology, Pohang 790-784, Korea
4
The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA
94720, USA
5
Materials Sciences Division, Lawrence Berkley National Laboratory and Departmentof Physics, University of California, Berkeley CA 94720, USA
2Interactions between two different materials sometimes induce novel
physical properties that do not exist in each material alone or provide a
viable route towards the comprehension of intrinsic physical propertiesof each material. In this talk, I introduce my recent study on theelectronic properties of graphene on SiC(0001) and SrTiO3 substrates
investigated using angle-resolved photoemission spectroscopy.
SiC(0001) is a well-known substrate for epitaxial growth of graphene,
but hosts a controversial issue on the origin of the high intensity
observed at the Dirac energy in the energy spectrum. The comparisonof the electron band structure of single-layer graphene to that of zerolayer and double-layer graphene suggests a major role of in-gap statesin constituting the observed spectral intensity. SrTiO3 is one of thewidely used materials as a substrate in preparing a thin film
heterostructure, which induces a lot of intriguing physical properties of
the adjacent thin film. The electron band structure of graphene on
SrTiO3 shows a deviation from the characteristic linearity that is not
explained by the Fermi liquid theory. Such deviation is further
enhanced with decreasing temperature revealing strong electronelectron correlations in graphene controlled by temperature.

Electron Transport Studies in Biological Molecules with Respect to the Science of Ageing
Harison Rozak*, Shukri Sulaiman, Mohamed Ismail Mohamed Ibrahim, Isao Watanabe.
Computational Chemistry Physics Lab (CCPL), School of Distance Education, Universiti Sains
Malaysia*Email: harisonrozak7@gmail.com
DNA or deoxyribonucleicacid store genetic information that consists of three structure
phosphate,sugar and bases[1]. Between the bases of DNA, there are electron transport. This
Electron transport in DNA considers as important biological phenomena and has relation withageing[2]. The process of electron transfer is the movement of charger from one molecule toanother molecule. Muon Spin Relaxation (µSR) technique provides a means to study suchphenomena at the microscopic level where electron motion can be probed [3]. There are two
mechanisms for electron transport namely tunneling and hopping[4]. The main objectives of thisresearch are to characterize electron transfer in DNA. Consequently this study would allow
theoretical and computational works to follow suit to determine the muon sites and theassociated hyperfine fields in these simpler components. This research composes of two parts
that is experimental and computational part . The Density Function Theory methodology will be
employed to study the electronic structure of the host environment and the muonatedsystem[5].
1.
2.
3.

4.
5.

Pray, L. (2008) Discovery of DNA structure and function: Watson and Crick.
Nature Education 1(1):100
Torikai, E., et al. "Electron transfer in DNA probed by the muon labelling method:
A new interpretation." Physica B: Condensed Matter 374 (2006): 441-443
Torikai, E., Nagamine, K., Pratt, F. L., Watanabe, I., Ikedo, Y., Urabe, H., &Grimm, H. (2001). Probing Electron Transfer in DNA–New Life Science with
Muons. Hyperfine interactions, 138(1-4), 509-513.
Boon, E. M., & Barton, J. K. (2002). Charge transport in DNA. Current opinion in
structural biology, 12(3), 320-329
Hubbard, P. L., Oganesyan, V. S., Sulaimanov, N., Butt, J. N., & Jayasooriya, U.
A. (2004). Avoided level crossing muon spectroscopy of free radicals formed bymuonium addition to the constituents of DNA. The Journal of Physical ChemistryA, 108(42), 9302-9309.

Analysis of multichimera states in nonlocally coupledphase oscillators
Division of Physics, Hokkaido Univ.
Yusuke Suda, Koji Okuda
In many various natural or artificial systems, nonlinear limit-cycle oscillators compose amany-body system, and interact with one another. The chimera state is one of the interesting behavior of these oscillator systems. The chimera state often appears in the systems of
nonlocally coupled identical oscillators, and is characterized by the coexistence of coherent synchronous region and incoherent not-synchronous region. Especially, the chimera state with two
or more coherent and incoherent region each is called the multichimera state.
We consider the system of nonlocally coupled identical phase oscillators∫ π∂θ(x, t) = ω −dx′ G(x − x′ ) sin(θ(x, t) − θ(x′ , t) + α)
(1)
∂t
−π
where θ(x) is 2π-periodic phase on the one dimensional space x ∈ [−π, π] under the periodic
boundary condition, ω is the identical natural frequency, and α is the phase lag parameter. The
coupling kernel G which is even provides nonlocal coupling, e.g. G(x) = (κ/2) exp(−κ|x|) [1-2]and G(x) = (2πr)−1 H(πr − |x|) where H is the Heaviside step function [3]. It is known thatthe chimera state has the steady mean field obtained by solving the self-consistent equation.
In this study, we have studied the multichimera state for the Eq. (1), especially, which
has two coherent and incoherent regions each as shown in Fig. 1, and analytically shownthat the mean field of such multichimera state depend∑∞ on only odd harmonic components{g2l−1 } (l ∈ N) for the coupling
kernelG(x)=k=0 gk cos(kx). Moreover, by using the∑∞coupling kernel Godd (x) =been able to obtain the mean
l=1 g2l−1 cos((2l − 1)x), we have ∑∞field of the multichimera state for the Eq. (1) with G(x) =k=0 gk cos(kx) by solving theself-consistent equation numerically.

Figure 1: The multichimera state for the Eq. (1) with ω = 0 and α = 1.500. The left figure (a)shows the snapshot of phase θ(x), and the right figure (b) shows the profile of the averagefrequency ⟨θ̇(x)⟩. We use the coupling kernel G(x) = (2πr)−1 H(πr − |x|) with r = 0.360.
[1] Y. Kuramoto and D. Battogtokh, Nonlinear Phenom. Complex Syst. 5, 380 (2002).
[2] D. M. Abrams and S. H. Strogatz, Int. J. Bifurcation Chaos 16, 21 (2006).
[3] O. E. Omel’chenko, Nonlinearity 26, 2469 (2013).

Gap structure of superconductivity mediated by orbital
nematic fluctuations
Tomoaki Agatsuma and Hiroyuki Yamase
Graduate School of Science, Hokkaido University
National Institute for Materials Science
Superconductivity mediated by spin fluctuations is extensively discussed for iron-based
superconductors. However, the typical phase diagram of iron-based superconductors shows theproximity not only to the antiferromagnetic phase but also to the nematic phase, suggesting
a possible important role of nematic fluctuations for the superconducting mechanism. In fact,assuming that the nematic phase is driven by the occupation diﬀerence between the dxz anddyz orbitals, Yamase and Zeyher found that orbital nematic fluctuations drive strong couplingsuperconductivity with a transition temperature comparable to that typically observed in ironbased superconductors [1].
In this study [2], following Ref. 1, we employ a minimal two-band model consisting of thedxz and dyz orbitals and choose model parameters to reproduce the typical Fermi surface geometry observed in iron-based superconductors (Fig. 1). We then solve the linearized Eliashberg
equations down to low temperatures with keeping a renormalization function. Our new aspect is that we keep also a full momentum momentum dependence of the pairing gap in the
Eliashberg equations, which was neglected in the previous study [1]. We can therefore elucidate
one of the fundamental properties of superconductivity, namely the typical gap structure ofsuperconductivity mediated by orbital nematic fluctuations.
We find that when the superconductivity occurs from the nordence and can be approximated to be nearly isotropic. The su-πperconducting instability can also occur from the orbital nematicky

mal phase, the pairing gap exhibits a weak momentum depen-phase. In this case, the pairing gap acquires a large modulation
on each hole-like Fermi surface and becomes highly anisotropic.

0

The gap on the electron-like Fermi surfaces, however, remains

0kx

almost isotropic. These gap structures are compared favorablywith some of angle-resolved photoemission spectroscopy data, in- Figure 1:π

Typical Fermi

dicating that orbital nematic fluctuations can be important to surfaces of iron-based susuperconductivity in iron-based superconductors.

perconductors.
curves[1] H. Yamase and R. Zeyher, Phys. Rev. B 88, 180502(R) (2013).
[2] T. Agatsuma and H. Yamase, arXiv: 1609.02861.

denoteBlack (red)hole-like(electron-like) Fermi surfaces.

NMR study for charge ordered state in''-(BEDT-TTF)4Pt(CN)4·H2O
Dept. of Phys. Graduate School of Science, Hokkaido Univ.
Takumi Waragai, Yosuke Futami, Yoshihiko Ihara, Atsushi Kawamoto
In some organic superconductors, superconductivity is observed in the neighborhood of chargeordered phase. Charge fluctuation near the charge ordering instability has been suggested to inducesuch superconductivity. In the charge ordered state, electrons are localized. Localized electrons are,in principle, incompatible with superconductivity. It is very important to clarify the relationshipbetween the superconducting phase and the charge ordering phase in order to understandsuperconducting pairing mechanism. In ''-(BEDT-TTF)4Pt(CN)4·H2O at ambient pressure, electric
resistivity shows metallic behavior from 300 K down to about 200 K[1]. Below 200K,
semiconductor-like electrical resistivity is observed. From the result of electronic resistivity
measurement, it is revealed that a weak charge ordering transition occurs at 200K. From the result ofRamon spectroscopy measurement, it is also suggested that the charge separation occurs at ambientpressure[2]. In temperature-pressure phase diagram constructed from the electric resistivity
measurement, semiconducting phase is located at the lower pressure side. This state is considered tobe the charge ordered phase. Under the hydrostaticpressure, the Pt salt shows superconductivity aroundTc = 2K. Therefore, this salt is a good candidate to
study the relationship between superconducting
phase and charge ordered phase. We measured thetemperature dependence of NMR spectrum andnuclear spin-lattice relaxation rate T1 by means of13
C NMR analysis in order to elucidate theelectronic state in the charge ordered phase of the Pt
salt at ambient pressure. Figure 1. shows NMR
spectra of the Pt salt at ambient pressure. The
magnetic field is 7 T and applied parallel to the
conducting plane of the Pt salt. At 240 K, 4 peaks
which originate from 4 crystallographicallydifferent 13C sites were observed. However,800
spectrum was not observed once at 200K, thenbroad spectrum was observed at the lower
temperatures. This result shows that there is theFig. 1. Temperature dependence of 13C-NMR
charge order transition at 200 K. We found the clear
spectrum with applying magnetic field parallel
charge ordering transition at 200K. In theto the conducting plane.
presentation, I will show the detailed analysis about
the temperature dependence of NMR shift and T1.

[1] H. Mori et al., Solid State Communication 80, 412 (1991).
[2] T. Yamamoto, Crystals 2, 893-934 (2012).

Investigation of magnetic ordered states in the pyrochlore iridates(Nd1-xCax)2Ir2O7
R. Asih1,2, N. Adam1,3, S. S. Mohd-Tajudin1,3, S. Maeda4, K. Matsuhira4, M. Wakeshima5,
Y. Hinatsu5, A. Miyake6, M. Tokunaga6, I. Watanabe1,2,3,5, T. Nakano2, and Y. Nozue2
RIKEN Nishina Center1, Dept. of Phys. Osaka Univ.2, Universiti Sains Malaysia3,
Kyushu Institute of Technology4, Hokkaido Univ.5, ISSP University of Tokyo6

Pyrochlore iridates, R2Ir2O7 (R227, R = Y and lanthanide elements), haverecently attracted growing interests because of their potential to realize topologicalstates. The comparable of electron-electron correlation (U) and spin orbit interaction(SOI) in these well-known frustrated systems generates a large systematic variationin properties with changes in R [1, 2]. Among these iridates, Nd2Ir2O7 stands out as afascinating system because of additional interesting properties. Nd2Ir2O7 is an ideal
system to realize the all-in all-out (AIAO) magnetic structure where dipoles point the
local axes toward and outward the tetrahedron center. This unique structure retains
the inversion symmetry of the pyrochlore lattice realizing the topological semimetalstates [2]. Moreover, AIAO structure has theoretically been predicted to drive aquantum critical point because the anisotropy of this structure can be tuned, forexample, by using light carrier doping.
In this study, we report the effect of Ca
substitution on the magnetic ordered states in
Nd2Ir2O7 investigated by muon-spin
relaxation. This Ca-substitution leads to thedoping of carriers (holes) in the Ir 5d band.
The pure Nd2Ir2O7 shows metallic behavior
at high temperature and undergoes metalinsulator transition (MIT) at 33 K [3]. As
shown in the Fig. 1, the hole-doping
gradually suppressed the TN and the internal
field coming from Ir4+ ordering, while theinternal field coming from Nd3+ ordered
Figure 1. Temperature dependence of the
moments tended to increase. Nd3+ momentsinternal field at muon sites in (Nd1show the static ordering below about 10 K
xCax)2Ir2O7. Solid lines are a guide to thewhich is independent to the Ca concentration.
eye. Ir moments order simultaneously at
TMI while Nd moments mainly order
Detail results and discussions of the µSR
below 10 K.
measurements on (Nd1-xCax)2Ir2O7 will bepresented in the talk.
References:[1] J. S. Gardner et al., Rev. Mod. Phys. 82, 53 (2010)[2] X. Wan et al., Phys. Rev. B 83, 205101 (2011)[3] K. Matsuhira et al., J. Phys. Soc. Jpn. 80, 094701 (2011).

Effect of organic materials used in the synthesis on the emission of
CdSe Quantum Dots
Jae-Won Lee, Min Jung Lee and Ho-Soon Yang*
Department of Physics, Pusan University, Busan 609-735
Quantum dots (QDs) have attracted considerable interest for both basic researches and industrial
application. QD nanocrystals have particular optical properties due to the quantum confinement
effect and surface effect. The practical applications all require the fundamental understanding of thephotophysical properties which are strongly affected by size and surface condition.
We prepare CdSe QDs using a chemical colloidal method, where the balance between nucleationand growth is the key for controlling QD size and size distribution of the resulting QDs. A chemical
colloidal method, a low costing synthesis method, is widely used to grow QDs with a narrow size
distribution. The surface of QDs prepared by the chemical colloidal method is complicated due tothe surface imperfection and the organic materials used in the synthesis procedure. The number ofatoms existing at QD surface reaches a half of total number of atoms forming a QD as the size
reduces to a few nanometers, and therefore, the surface condition of QD is important indetermination of the physical properties of QDs. This study focuses on the effects of organic
materials on the surface on the emission of QDs.
As using 1-hexadecylamine or tri-octylphosphine oxide in the synthesis of QDs, we prepare two
sets of CdSe QDs having different surface conditions. The QDs prepared with 1-hexadecylamine in
the synthesis show strong emission, while the quantum dots prepared with tri-octylphosphine oxide
exhibit a suppressed emission and an extra emission related with the surface energy traps. These
organic materials make the surface conditions of quantum dots different. TEM images and X-ray
diffraction patterns reveal that 1-hexadecylamine constructs a layer on the surface of quantum dot
during the synthesis and this surface passivation by a layer of 1-hexadecylamine reduces the surface
energy traps. Differently from 1-hexadecylamine, tri-octylphosphine oxide dangles from the surface,which causes a poorly passivated surface. This generates the surface deep trap levels giving rise to asignificant and broad emission in the lower energy regime. The optical mechanism is studied bymeasuring the emission and the time-resolved spectra at various temperatures from 4 K to 300 K.

Muon-spin Relaxation Function in Dilute Spin System
By Muhamad Darwis Umar
Abstract
This work is only to analytically perform the previous results. In static internal field, ourderivation to an applied field-Gaussian case confirms Kubo’s et al work, but for Loretziancase, it shows a competition of divergent terms. This result was also reported by Larkin et alby applying Kubo Golden Rule (KGR). In dynamic case, our derivation confirms the
Hayano’s et al result. The strong collision and frozen muons at an interstitial sites models
have been used to analytically re-derive Muon relaxation function in dilute spin glasses andconfirm the work result by Uemura et al. The correlation function of spins is divided into twoparts to cover the coexisting static and dynamic internal random fields.

Ground state magnetic Raman scattering in
antiferromagnetic spin tubes
Department of Physics, Hokkaido University
Takashi Inoue and Shoji Yamamoto
Magnetic Raman scattering is important probe to study magnetic excitation of antiferromagnets and there are many experimental observations and theoretical calculations. Magnetic
Raman operator is described as exchange interaction by light and written by equation (1)[1].
Here êi and ês are the polarization vectors of the incident and scattered light, δ is a vector
connecting two sites, Jδ is the exchange interaction on the δ bond and Sr is a spin operator ofsite r. In terms of the eigenstates |n⟩ and eigenvalues En of the Heisenberg model, magnetic
Raman scattering intensity is given by Fermi’s golden rule and described by equation (2).
∑∑Jδ (êi · δ)(ês · δ)Sr · Sr+δ
(1)
R=
r

I(ω) =∑

δ)2 (⟨n|R|0⟩ δ ℏω − (En − E0 )(2)n

In this study, we evaluated Raman scattering intensity (2) of D4h symmetry antiferromagnetic
Heisenberg spin tube (Fig.1). Fig.2 shows the magnetic Raman spectrum which calculated bymodified spin wave theory (non-perturbative case: MSW-NP, perturbative case: MSW-P) [2, 3]
and exact diagonalization(ED)[4]. The spectrum of MSW-NP has two large peaks, but MSW-P
spectrum has one large peak and one small peak. In comparison with ED result, peak positions
and structures are improved by introducing to magnon-magnon interaction as perturbation.
Details of calculations and discussions will be reported in the presentation.

Fig.1 Schematic pictureof D4h square prism spin
tube.
Fig.2 B1g mode magnetic Raman spectra at spin tube length L = 4.

[1] B. S. Shastry and B. I. Shraiman, Int. J. Mod. Phys. B 5, 365 (1991).
[2] M. Takahashi, Phys. Rev. B 40, 2494 (1989).
[3] C. M. Canali and S. M. Girvin, Phys. Rev. B 45, 7127 (1992).
[4] A. W. Sandvik, S. Capponi, D. Poilblanc and E. Dagotto, Phys. Rev. B 57, 8478 (1998).

Role of the π-electrons in the anomalous
anti-ferromagnetic
ferromagnetic insulating phase of λ-(BETS)(BETS)2FeCl4
Hokkaido university1, RIKEN2
Nihon university3
Taehoon Lee1,2, Yugo Oshima1,2, Hengbo Cui2,
Akiko Kobayashi3 and Reizo Kato2
The two-dimensional
dimensional organic conductor λ-(BETS)2FeCl4 is composed from theconducting π-electrons
electrons of BETS molecules and the magnetic dd-electrons
electrons of Fe3+
ions. Due to non-negligible
negligible interaction between π- and d-electrons
electrons, λ-(BETS)2
FeCl4 has fascinating phase diagram as a function of temperature and magnetic
field such as an anti-ferromagnetic
ferromagnetic insulating(AFI) phase, a paramagnetic metal (PM)phase and a field-induced
induced superconducting(FISC) phase [1]. The AFI phase of λ(BETS)2FeCl4 is under a strong debate
whether the d-electrons
electrons are long rangeordered or not [2,3]. Therefore, to have a
microscopic information about AFI groundstate, we have investigated the AFI and PM
phases using X-band
band and high-field ESR
spectroscopy.
Below 4 T,, we have observed conventional
Fig. 1 Temperature dependence ofanti-ferromagnetic resonance (AFMR) for
AFMR spectra at 177 GHz.
hard-axis. However, we have surprisingly
observed two ESR signals above 4 T (Fig. 1).
We have also performed X--band ESR measurements on λ-(BETS)2FeCl4. The magnetic
field was rotated parallel to the ac-plane. We
have observed the spin-flop
flop resonance which
has a bubble-like
like structure. The center of the
bubble corresponds to the easy
easy-axis, and theeasy-axis
axis seems to change with temperatureeasy-axis changing(Fig. 2). These results suggest that theelectric state of π-electrons is changing inside
Fig. 2 Angular dependence of
the AFI phase. In my presentation,
resentation, I will
spin-flop resonance .
discuss about this anomalous anti-ferromagnetic ground state of λ-(BETS)(BETS)2FeCl4[1] S. Uji and J. S. Brooks, J. Phys. Soc. Jpn. 75, 051014 (2006).
[2] H. Akiba et al.,., J. Phys. Soc. Jpn. 78, 033601 (2009)[3] L. Brossard et al.,., Eur. Phys. J. B 1, 439-452 (1998).

Effect of oxidation in oxygen-deficient SrFe0.8Co0.2O3-δ thinfilms
Joonhyuk Lee, Eunyoung Ahn, Yu-Seong Seo*, Younghak Kim**, Jae-Young
Kim**, Jungseek Hwang**, Yunhyeong Jang, Jinhyung Cho***, and Hyoungjeen
Jeen

Department of Physics, Pusan National University, Busan, 46241, Korea,*Department of Physics, Sungkyunkwan University, Suwon, Gyeonggi-do, 16419,
Korea, **Pohang Accelerator Laboratory, Pohang University of Science andTechnology, Pohang, 37673, Korea, ***Department of Physics Education, Pusan
National University, Busan, 46241, Korea

X-ray absorption spectroscopy (XAS) is a powerful technique to measure the valence state of transition metals,
degree of hybridization between oxygen and transition bond, element specific magnetism. Study of transition
metal oxides is being many researched due to diverse physical properties. XAS is an invaluable tool, since theseproperties are often induced by the number of electrons in the transition metal ions. Controlling oxygen contents
is a route to change the valence state in the transition metal oxides and often leads to various phase transitions. In
this study, we studied effect of oxygen intercalation into SrFe 0.8Co0.2O3-δ (SFCO) thin films. we grow epitaxial
SFCO films on (001) (LaAlO3)0.3-(SrAl0.5Ta0.5O3)0.7 substrates by pulsed laser deposition. We checked
crystallinity from high resolution x-ray diffraction. From diffraction study, we could confirmed the oxygen
intercalation into the SFCO thin films were successfully without losing crystallinity. From transport and optical
study, the electronic phase transition from insulating phase to metallic phase upon oxygen intercalation took place.
To compare between electronic properties and valence states of Fe, Co and O, we performed XAS measurementof Fe L-edge, Co L-edge and O K-edge spectra.

Hall effect in the Abrikosov lattice of type-II superconductors
Wataru Kohno, Hikaru Ueki, Takafumi Kita
Department of Physics, Hokkaido University, Sapporo 060-0810, Japan,
e-mail: wataruv@phys.sci.hpkudai.ac.jp

The Lorentz force on electric currents flowing in magnetic fields generally induces charge
redistribution before recovering a steady state to yield the Hall voltage that brings a force balancealong the transverse direction. However, we still have quite a poor understanding of this phenomena
in superconductors. This is because the force on supercurrent itself may easily be overlooked in thepresence of the predominant diamagnetic effect by supercurrent. Indeed, the Lorentz force ismissing from the standard Ginzburg-Landau and Eilenberger equations that have been used
extensively in the literature, and can only be reproduced microscopically as a next-to-leading ordercontribution in the expansion in terms of the quasiclassical parameter based on the Gor'kov
equations. Hence, physics of the Lorentz force in superconductors remains mostly unexploredtheoretically. The main purpose of our study is to clarify the fundamental nature of the Hall effect insuperconductors.
Hall effect in superconductors may be divided into two categories: one in equilibrium withpersistent currents and the other in nonequilibrium situations with the motion of vortices anddissipation. The first one is inherent to superconductors and easier to handle but nevertheless has
not been paid much attention in the literature. Here, we focus on this first category and study vortex
charging in type-II superconductors as a function of the magnetic field based on the augmented
quasiclassical equations of superconductivity [1,2]. We study the charge density and electric field
due to the Lorentz force in the vortex lattice of clean type-II superconductors focusing on the two
types of models below: (i) s-wave pairing with isotropic Fermi surface in two dimension [3] and (ii)d𝑥 ! −𝑦 ! -wave pairing with anisotropic Fermi surface obtained from the tight-binding approximation
for two-dimensional square lattice model. Results and considerations are shown in detail in ourpresentation. The two figures below are part of the results obtained from our study.

Fig. 1. Field dependence of the charge density in an swave superconductor (model (i)) at the vortex center [2].
ρsingle and ρKhomskii denote the charge density at thelower critical field and at the absolute zero temperature
in Ref. [4].

References

Fig. 2. Spatial structure of the charge density ina d-wave superconductor with anisotropic
Fermi surface (model (ii)) at T/Tc=0.3 andH/Hc2 =0.29, where Tc is transition temperature
at H=0 and Hc2 is upper critical, respectively.
Black circle indicates the boundary of theregion which occupies the half area of the unit
cell in the vortex lattice.

[1] T. Kita, Phys. Rev. B. 64, 054503 (2001).
[2] H. Ueki, W. Kohno, and T. Kita, J. Phys. Soc. Jpn. 85, 064702 (2016).
[3] W. Kohno, H. Ueki, and T. Kita, J. Phys. Soc. Jpn. 85, 083705 (2016).
[4] D.I. Khomskii and A. Freimuth, Phys. Rev. Lett. 75, 1384 (1995).

High-pressure synthesis and thermoelectric properties of EuxCo4Sb12
J. Sirimart, R. Nakajima, K. Nishine, Y. Mona, J. Hayashi, Y. Kawamura and C. Sekine
Muroran Institute of Technology, 27-1 Mizumoto-cho, Muroran, 050-8585, Japan.
We present the thermoelectric properties of partially Eu filled skutterudite compounds EuxCo4Sb12
prepared under high pressure using a cubic anvil press. CoSb3-based skutterudite compounds havebeen regarded as one of the best candidates of thermoelectric materials because the compound has
excellent thermoelectric properties such as large Seebeck coefficients and high hole mobilities, while
the lattice thermal conductivity is too high [1]. The vacancy inside the Sb-cage of CoSb3 can accept a
relatively large guest ion. Therefore, a marked rattling effect is expected owing to the large vibrationof the guest ion located inside the cage. We focused on Eu as a guest ion because Eu is believed to beeasier to fill in the vacancy of CoSb3. The synthesis of Eu0.54Co4Sb12 at ambient pressure has beenreported [2]. However, higher Eu filled samples than Eu0.54Co4Sb12 has not been reported. In order toincrease the filling ratio of Eu, we synthesized EuxCo4Sb12 by using the high-pressure synthesis
method. The samples were prepared by reacting stoichiometric amounts of 3N (99.9% pure)-Eu, 4NCo, and 6N-Sb powders at 2 GPa and kept at 600 °C. The phase compositions and actual Eu filling
ratios were characterized by x-ray diffraction (XRD) and electron probe microanalysis (EPMA),
respectively. The XRD results indicate the samples under high pressure and high temperature method
have larger lattice parameter than any EuxCo4Sb12 prepared at ambient pressure. The EPMA results
show that the maximum actual Eu doping content was increased to 0.77. Thermal conductivity,
Seebeck coefficient and electric resistivity for EuxCo4Sb12 have been studied over the temperature
range between 2 and 300 K. The electrical resistivity shows semi-metallic behavior. The Seebeckcoefficient exhibits a behavior of n-type conductor. The highly doped Eu can enhance electricalconductivity and reduce thermal conductivity. The maximum value of electrical conductivity andthermal conductivity of EuxCo4Sb12 at 300 K were 11.5×104 S/m and 5.43 W/mK, respectively.
[1] G. S. Nolas, J. L. Cohn, G. A. Slack, Phys. Rev. B 58, 164 (1998).
[2] W. Jeitschko, A. J. Foecker, D. Paschke, M. V. Dewalsky, C. B. H. Evers, B. Kunnen, A. Lang, G. Kotzyba,
U. C. Rodewald, M. H. Möller, Z. Anorg, Allg. Chem. 626, 1112 (2000).

Muon in High-Tc superconducting YBa2Cu3O6
S.S. Mohd-Tajudin,1,2 T. Nishizaki,3 A. Kikkawa,4 N. Adam,1,2 E. Suprayoga,2,5
M.I. Mohamed-Ibrahim,1 S. Sulaiman,1 and I. Watanabe.2
1
Universiti Sains Malaysia, 2RIKEN Nishina Center, 3Kyushu Sangyo University,
4
RIKEN CEMS and 5Institut Teknologi Bandung.
Most of high-Tc superconducting oxides are cuprate compound [1]. In the crystal
structure, CuO2 planes are responsible for the electronic properties, the presence ofsuperconductivity can be observed by doping carriers into the CuO2 plane of theantiferromagnetic (AF) Mott-insulator compound. With doping, the insulator-metaltransition arises and the system changes from the Mott-insulator to high-Tc
superconductors. A rewarding strategy in understanding the electronic properties ofhigh-Tc has been to study Mott-insulator YBa2Cu3O6 (YBCO) compound whichshows a magnetic ordering.
One of the technique to understand the electronic states, spin structures andhyperfine field is Muon Spin Relaxation (µSR). [2] We implanted muon in the
YBCO compound by µSR experiment and computational using Density Functional
Theory (DFT) method. We observed the muon behavior in µSR experiment and DFT
calculation. Since muon is a particle, it is vibrating and thus it has zero potential
energy. In our presentation, we are going to report more detailed on who zeropotential energy affect the hyperfine field.

References[1] M.Cyrot and D. Payuna, Introductin of Superconductivity and High-Tc Materials, World
Scientific, Singapore (1991).
[2] S.S. Mohd-Tajudin, J. Phys.: Conf. Ser. 551 012052 (2014).

Tests for the Novel Magnetoelectric Effects on a Toroidal
Magnetic Ordered State of UNi4B
1

Graduate School of Science, Hokkaido University, 2KEK IMSS CMRC

H. Saito1, N. Miura1, C. Tabata2, H. Hidaka1, T. Yanagisawa1, and H. Amitsuka1

Toroidal moment is one of the parameters which describes the strength of themagnetoelectric effect. In the last decade, the toroidal order, which is the ordered periodic
array of toroidal moments, has attracted much interest in connection with multiferroic
insulating materials. Recently, S. Hayami et al. suggested theoretically that such an exotic
order can occur in metallic systems without local inversion symmetry at magnetic ion
sites. In addition, they also suggested that the exotic phenomena such as magnetizationinduced by electric current and Hall voltage which is proportional to the square of electric
current I2 can occur in the toroidal ordered metal [1].
UNi4B crystalizes in the orthorhombic structure (symmetry: Cmcm, D2h17, No.
63)[2]. The actual lattice can be treated as a slightly distorted hexagonal structure, where
U ions form the distorted triangular lattice. Below TN (= 20.4 K), UNi4B orders
antiferromagnetically in a magnetic structure where the magnetic moments carried by the
2/3 of U ions make the vortices in each of triangular planes [3]. This magnetic structureis the same as the one assumed in the above theory.
In order to make a test for the theory, we have performed the measurements ofmagnetization under electric current and Hall coefficient in UNi4B for the first time.
Magnetization measurements under electric current revealed that magnetization ischanged by electric current below TN. Comparing the features of this phenomena with thetheory, we conclude that electric current induces magnetization in the ordered state of
UNi4B[4]. Thus, in the sense that current-induced-magnetization is observed in a metallic
system without local inversion symmetry, the validity of the theory is confirmed in partby the experiments. On the other hand, I2 dependence of Hall voltage is not observed in
the accuracy of present measurements, may be due to the considerably small currentinduced-magnetization.
[1] S. Hayami et al., Phys. Rev. B 90, 024432 (2014).
[2] Y. Haga et al., Physica B 403 900-902 (2008).
[3] S. A. M. Mentink et al., Phys. Rev. Lett. 73, 1031 (1994).
[4] H. Saito et al., JPS autumn meeting, 9aBK-13 (2014).

High-pressure synthesis and magnetic properties of layered rare-earth phosphide
GdZn3P3 and DyZn3P3
K. Ikemori, K. Suzuki, Y. Kawamura, J. Hayashi and C. Sekine
Muroran Institute of Technology, 27-1 Mizumoto-cho, Muroran, 050-8585, JapanThe ternary phosphide RZn3P3(R = rare-earth) crystallizes in the hexagonal ScAl3C3-type structure(space group P63/mmc) [1]. In the compound, R atoms form a two dimensional triangular lattice. The
isostructural compound CeZn3P3 is attracting much attention as a low-dimensional quantum spin
system [2]. GdZn3P3 and DyZn3P3 are also expected to exhibit an anomalous magnetic behavior basedon the frustrated R atom geometry. However, the physical properties of the compounds have not been
investigated so far. In this study, we have prepared GdZn3P3 and DyZn3P3 samples using ahigh-pressure synthesis technique and their magnetic properties have been investigated for the firsttime. The magnetic susceptibility of GdZn3P3 and DyZn3P3 follows a Curie-Weiss law with theeffective magnetic moment µeff = 8.27 µB /Gd and 11.61 µB /Dy, respectively. These values are in good
agreement with 7.94 µB /Gd and 10.63 µB /Dy, respectively. Weiss temperature θP = −4.50 K
and −0.62 K, respectively. The specific heat of GdZn3P3 and DyZn3P3 indicates a phase transition
around 4 K and 15 K, respectively. While magnetic susceptibility of GdZn3P3 exhibit a cusp anomaly
like an antiferromagnetic ordering around 4 K, the distinguished anomaly around 15 K was notobserved for DyZn3P3. In spite of large magnetic moments, GdZn3P3 has very low magnetic transition
temperature and DyZn3P3 exhibits no clear magnetic transition. The results suggest the existence ofmagnetic frustration in this system.
[1] A. T. Nientiedt and W. Jeitschko, J. Solid State Chem. 146, 478 (1999).
[2] A. Yamada, N. Hara, K. Matsubayashi, K. Munakata, C. Ganguli, A. Ochiai, T. Matsumoto, Y.
Uwatoko, J. Phys.: Conf. Ser. 215, 012031 (2010).

13C NMR study of insulating phase in -(ET)2GaCl4a

Department of Physics, Hokkaido University
The Institute for Solid State Physics, The University of Tokyo
Y. Saitoa, T. Kobayashia, S. Fukuokaa, A. Kawamotoa, and H. Moribb

Quasi-two-dimensional organic conductors -(BETS)2MCl4 (M = Ga, Fe) [BETS:
bis(ethylenedithio)tetraselenafulvalene] have attracted much attention because theyshow novel superconducting states such as Fulde–Ferrell–Larkin–Ovchinnikov(FFLO) state and magnetic field-induced superconductivity (FISC) state under highmagnetic field [1-2]. A d-wave superconducting (SC) gap structure was reported by
specific heat measurement [3]. The mechanism of the superconductivity of  salts isstill unclear, although the universal phase diagram was predicted, where theinsulator phase is adjacent to the SC phase [4]. Nature of the insulating phase in thevicinity of SC phase gives important information to discuss the mechanism of thesuperconductivity. Previously, we performed 13C NMR in -(STF)2GaCl4 [STF:bis(ethylenedithio)diselenadithiafulvalene], which its ground state is located in thevicinity of SC phase of -(BETS)2GaCl4. Although a marked enhancement of
antiferromagnetic (AF) spin fluctuation was observed with decreasing temperature,no magnetic ordering was observed down to 1.63 K. One of the reasons of suppressing
AF ordering is that positional disorder of Se atoms in STF molecules. The grounddecreasing temperature and exhibits adivergence peak at TN = 13 K. Simultaneously, aspectrum splitting was observed. These are clear
evidence of AF ordering in -(ET)2GaCl4. We willshow the detailed results in this presentation.
[1] W. A. Coniglio et al., PRB 83, 224507 (2011).
[2] S. Uji et al., Nature 410, 908 (2001).
[3] S. Imajo et al., JPSJ 85, 43705 (2016).
[4] H. Mori et al., Phys. C Supercond. 357–360, 103(2001).

(T1T)-1 (sK)-1

state of -(ET)2GaCl4 [ET: bis(ethylenedithio)tetrathiafulvalene], which is the moreinsulating side than -(STF)2GaCl4 without positional disorder is interesting.
Therefore, to clarify the magnetic nature of the insulating ground state of the salts
without disorder, we performed 13C NMR study for -(ET)2GaCl4.
Figure 1 shows the temperature dependence of
8-1-1(T1T ) . The (T1T ) gradually increases with
7
6
5
4
3
2
1
0

0

20

40

60

80

100

Temperature (K)FIG. 1 Temperature dependence of(T1T)-1 of-(ET)2GaCl4.

Sn-doping concentration-dependent physical property variation of
Fe2O3 powders
Sehwan Song1, Ji Woong Kim1, Dooyong Lee1, Jisung Lee1, Taewon Min1, Jong-Ah Chae2, Jong-Seong Bae3,
Jaekwang Lee1, Jeong-Soo Lee4 and Sungkyun Park1,2,*
1

Department of Physics, Pusan National University, Busan 46241, Korea

2Core Research Facilities, Pusan National University, Busan 46241, Korea
3

Busan Center, Korea Basic Science Institute, Busan 46742, Korea

4

Neutron Instrument Division, Korea Atomic Energy Research Institute, Daejeon 34057, Korea

Abstract
In many useful energy harvesting applications based on binary oxide systems, Fe2O3 is one of theuseful materials in the photoelectrochemical cells applications [1]. However, relatively low electricalconductivity of the Fe2O3 prohibited its possible application as a photoanode material. Recently, there
were many researches to improve its electrical properties by doping 4+ ions in the system [2]. In
particular, Sn can be a good candidate to improve electrical conductivity of the Fe2O3 system. However,the details of physical mechanisms are less investigated.
In this presentation, we showed the physical property variations of Fe2O3 powders by varying Sn
doping concentrations (0%, 1%, 2%, 3%, 4%, 5%). In the structural view, phase pure Sn-doped Fe2O3
samples were obtained when Sn doping concentration is less than 2% with slight increase in a unit cellvolume. For the higher Sn-doped Fe2O3 powders, the formation secondary phase (i.e., SnO2) was
noticed from Rietveld analysis. Furthermore, the energy-dispersive-spectroscopy analysis usingtransmission electron microscope revealed the non-uniform distribution of Fe and Sn while O remained
uniform distribution. From the spectroscopic analysis using X-ray photoelectron spectroscopy, Fe2+state increased with increasing Sn-doping concentration. The detailed correlation between electricalconductivity and chemical state variations (or the effect of secondary phase) will be discussed.

This work was supported by the Industrial Strategic Technology Development Program (10062130)
funded by the Ministry of Trade, industry & Energy (MI, Korea), NRF Korea (NRF2015R1D1A1A01058672) and the Korea Atomic Energy Research Institute.

[1] M. Gratzel. Nature 414 (2001) 388-344[2] Y. Ling et al. Part. Part. Syst. Charact. 31 (2014) 1113-1121*

psk@pusan.ac.kr

µSR and DFT studies on (Ce1-x Lax)M2Al10 (M = Ru, Os)
1

RIKEN Nishina Center, 2Universiti Sains Malaysia
1,2Noraina Adam

Ce-based caged-type compound CeM2Al10 (M = Ru, Os) exhibits unusual Kondo
semiconducting behavior with an anomalously high magnetic transition temperature,
T0 ~ 30 K [1,2]. Neutron diffraction studies of CeM2Al10 (M = Ru, Os) revealed
small ordered moment along the c-axis with magnitude of 0.34 µB and 0.29 µB [3],respectively, although the magnetic susceptibility shows a large anisotropy along thea-axis followed by c- and b-axes [4]. The µSR investigation on hole doping effect inthe 4d and 5d systems which is Ru and Os shows a similar behavior as the neutron
diffraction studies where the magnitude of magnetic moment decreased graduallywith increasing hole doping percentage until the T0 disappeared without any spin
flop behavior occurred [5,6]. However with few percentages of electron doping in
the d system where Ru and Os are doped with Rh and Ir, respectively, the magnetic
moment enhanced from ~0.3 µB up to ~1.0 µB and its direction changed from along
c-axis to a-axis [7,8]. On the other hand, the investigation from neutron diffraction
studies on hole doping effect in the 4f system by doping Ce with few percentages of
La showed the magnetic moment reduced from ~0.3 µB to 0.1 µB along the hardest
b-axis instead of c- or a-axes [9]. However, the spin flop behavior only occurred in
Ce1-xLaxRu2Al10, not Ce1-xLaxOs2Al10. In this study, we are investigating the unusual
behavior of Ce1-xLaxM2Al10 (M = Ru, Os) by using the µSR technique and DFT
calculation. The investigation of these two compounds is beneficial in understanding
the relation of c-f hybridization strength between d and f systems.
[1] T. Nishioka et al. JPSJ 78, 123705 (2009)[2] M. Matsumura et al. JPSJ 78, 123713 (2009)[3] H. Kato et al. JPSJ 80, 073701 (2011)[4] Y. Muro et al. JPCS. 200, 012136 (2010)[5] D. T. Adroja et. al. PRB 87, 224415 (2013)[6] J. Kawabata et.al. PRB 89, 094404 (2014)[7] R. Kobayashi et al.. JPSJ 82, 093702 (2013)[8] D.D. Khalyavin et al., PRB 88, 060403 (2013)[9] D. T Adroja et al. PRB 90, 174422 (2014)

Figure 1

The internal field analysis ofCe1-xLaxOs2Al10 from the µSR experimentStudy of the charge density wave and superconducting phasein -(BEDT-TTF)2RbHg(SCN)4 probed by NMR spectroscopy
under uniaxial pressure.
Graduate School of Science Hokkaido Univ.
A. Ohnuma, H. Kumagai, T. Waragai, T. Kobayashi, Y. Saito,
S. Fukuoka, Y. Ihara, and A. Kawamoto
An isostructural series of organic conductors -(BEDT-TTF)2MHg(SCN)4 (M = K, Rb, NH4) haveattracted attention due to the variety of theelectronic properties. The charge density wave (CDW)

state is observed below 8 K and 10 K in the K and Rb salts, respectively [1,2], and thesuperconducting (SC) state is observed below about 1.5 K in the NH4 salt [3]. In this family, the SC
phase appears very close to the CDW phase.
To investigate the relationship between the CDW and SC phases, the electrical resistancemeasurements under the uniaxial strain were performed in the K and NH4 salts [4]. The uniaxial strain
within the conducting ac plane drastically changes the electronic properties, that is, the CDW state is
induced by the a-axial strain, and the SC state is induced by the c-axial strain. Namely, the SC
transition temperature increases up to about 7 K in the NH4 salt and up to about 3 K in the K salt.
13

C-NMR measurement was performed to investigate the electronic properties, and revealed thatthe distribution of the local density of states (DOS) at each 13C site. -type salts have four
non-equivalent 13C sites, Aa, Ab, B, and C, but we can measure the electronic properties separately byusing the spectroscopic advantage of 13C-NMR measurement. [5]. To reveal the uniaxial strain effects
microscopically, we performed 13C-NMR measurement under the c-axial strain in the Rb salt. From
the resistivity measurement, the Rb salt shows almost the same
electronic properties except for the slightly higher TCDW of 10 K.
The c-axial strain will induce superconductivity also in the Rb
salt.
In this study, we measured the spin-lattice relaxation time T1
and estimated the DOS at A and B sites under the c-axial strain.
Fig.1 shows the c-axial strain dependence of the transition
temperature and the DOS at A and B sites. It was revealed that the
DOS at B site increases with inducing the SC state.

[1] T. Sasaki et al Solid State Communications 75, 93(1990)[2] N. Kinoshita et al. JPSJ 60, 7 (1991)[3] H. H. Wang et al Physica C 166, 57(1990)[4] M. Maesato et al. PRB 64, 155104(2001)[5] Y. Ihara et al. PRB 90, 041107 (2014)

Fig.1 c-axial strain dependence ofthe transition temperature (a) andthe DOS at A and B sites(b).

µSR Studies on h8- and d8-𝜷′-(BEDT-TTF)2ICl2
J. Angel1,2, F. Astuti1,2, D. Puspita Sari1,3, H. Taniguchi4, and I. Watanabe1,2,3
RIKEN Nishina Center1, Hokkaido Univ.2, Osaka Univ.3, Saitama Univ.4

The quasi-two-dimensional organic antiferromagnet, β'-(BEDT-TTF)2ICl2, shows
antiferromagnetic magnetic ordering at around 22 K. In this study, we report the effectof deuterium substitution in β'-(BEDT-TTF)2ICl2 to investigate a change in themagnetic property and the critical phenomenon around the magnetic transition
temperature by the muon spin rotation method (SR). The sample was synthesized bya simple electrochemical method where eight protons in the BEDT-TTF molecule were
all replaced by the deuteriums. Then, we describe this deuterated system as d8-β'(BEDT-TTF)2ICl2.
Figure 1 shows the SR time spectraof d8-β'-(BEDT-TTF)2ICl2 measured in
the zero-field condition. The muon spin
precessions were clearly observed, whichshows the appearance of the magneticallyordered state. The precession frequency
becomeslarger

withdecreasing

temperature. Detailed results of the µSR
Figure 1. Zero-field time spectra ofβ'-(BEDT-TTF)2ICl2 at 10.7 K,
20.7 K, 21.5 K, 22.3 K, and 22.6 K.

measurementsond8-β'-(BEDT-

TTF)2ICl2 will be reported in ourpresentation.

References:[1] H. Taniguchi et al., Journal of Low Temperature Physics 142 437 (2006).
[2] Y. Eto and A. Kawamoto, Phys. Rev. B 81, 020512(R) (2010).

Magnetic properties in π-d system organic conductor λ’-(BEDT-STF)2 FeBr4
Dept. of Phys. Hokkaido Univ.
T. Wada, T. Minamidate, N. Matsunaga, K. Nomura, A. Kawamoto

Study of the π-d interacting system has been attracting much attention from researchers because ofsome unique and intriguing characters. For example, λ-(BETS)2FeCl4 which becomesantiferromagnetism in the ground state is a hot topic as the first organic material which shows a field
induced superconductivity [1]. We synthesized a novel quasi-two dimensional organic conductor
λ'-(BEDT-STF)2FeBr4 that consists of the conducting layers of donor (cation) molecule BEDT-STF
with π electrons and the insulating layers of anion molecule FeBr4 with d electrons. The λ' structure
is an isomorphous structure of the λ structure and only (BETS)2GaBr4 has been reported as λ' crystal
besides λ'-(BEDT-STF)2FeBr4 [2]. In the presentation, I'll report the crystal structure ofλ'-(BEDT-STF)2FeBr4 and its magnetisation.
Figure 1 shows temperature dependence of magnetic susceptibility. The behaviour of susceptibility
follows the Curie-Weiss law in high temperature region and it has a maximum at about 3 K. We fit
the model, where Fe 3d spins are in a constant internal magnetic field below the antiferromagnetictransition temperature TAF, to this behaviour of susceptibility. The red solid line depicts a calculated
susceptibility from the model of 3d spins in 1.6 T internal field and it agrees with the data. It's beenreported that the model of 3d spins in 4 ~5 T internal field well explains susceptibility ofλ-(BETS)2FeCl4 [3] and λ-(BEDT-STF)2FeCl4 [4]. Therefore, in λ-λ' type crystals, it's a common
characteristic that 3d spins in an internal magnetic field are the origin of magnetisation below TAF.
0.8

[1] Uji, S. et al.
0.75 T (H//c)
Fitting curve

Chem. Lett. 1999, 133.
[3] Akiba, H. et al.
JPSJ. 2011, 80, 063601.
[4] Minamidate, T. et al.
71st JPS annual meeting (2016)
22pBE-4

χ (emu/mol)

Nature. 2001, 410, 908.
[2] Tanaka, H. et al.

0.6λ'-(BEDT-STF)2FeBr4
0.4

0

2

4
T (K)

6

8

Figure 1: Temperature dependence of magnetic susceptibility at 0.75 TTitanium nitride nanoparticles supported ceramic microfibers as efficient solar steam
generators
Manpreet Kaur1,2, Satoshi Ishii2,3*, Satish Laxman Shinde2,3 and Tadaaki Nagao1,2,,3*
1International Center for Materials Nanoarchitectonics (WPI- MANA), National Institute for Materials
Science (NIMS), Tsukuba, Ibaraki, 305-0044, Japan2
Department of Condensed Matter Physics, Hokkaido University, Sapporo 060-0810, Japan
3
Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology
Agency (JST), Kawaguchi, Saitama, 332-0012 Japan.

Considering the fact that energy consumption to heat rooms and water can exceed 50 percent
even in developed countries, solar water heating systems are one of the most successful
applications of solar energy utilization to generate heat even in such countries [1,2].Titanium
nitride (TiN) nanoparticles (NPs) exhibit broad plasmonic resonances which cover the majorityof solar spectrum from UV to near infrared. The damping of plasmonic resonances leads togenerate highly localized heat in nanometer scale. Since TiN is chemically stable and non-toxic,
TiN is an excellent candidate for solar heat applications [3,4]. Due to the promising results
obtained for TiN NPs as efficient sunlight absorbers, we select them for developing an effective
solar heating composite. So far, TiN NPs were simply dispersed in water, which makes themdifficult to handle and re-use for real application in society [5].
We develop a composite material where titanium nitride nanoparticles (TiN NPs) are
immobilized to ceramic fiber wools (CWs). The composite sample has improved photothermal
performance compared to TiN NPs dispersed into water. The composite structure effectively
keep water supply to the surfaces by microfibers capillary force. The wide absorption
wavelength and localized plasmonic effect of TiN NPs along the microfibers of the CWs
resulting in solar thermal conversion efﬁciency of more than 80% at only 100 mWcm- 2
illumination irradiance. This reusable and portable structure can be used for solar water
distillation as well as solar water heating without losing the nanoparticles into water.

[1]
[2]
[3]
[4]
[5]

P. Qin, H. Zhu, T. Edvinsson, G. Boschloo, A. Hagfeldt, L. Sun, J. Am. Chem. Soc 2008, 130, 8570-8571.
A. Shukla, D. Buddhi, R. Sawhney, Renew. Sustainable Energy Rev. 2009, 13, 2119-2125.
M. Quinten, Appl. Phys. B 2001, 73, 317-326.
A. Reinholdt, R. Pecenka, A. Pinchuk, S. Runte, A. Stepanov, T. E. Weirich, U. Kreibig, The European
Physical Journal D-Atomic, Molecular, Optical and Plasma Physics 2004, 31, 69-76.
S. Ishii, R. P. Sugavaneshwar, T. Nagao, J. Phys. Chem. A 2016, 120, 2343-2348.

Electron Correlation Effect on Non-equilibrium Phase Separation
Studied by Polarized Femtosecond Spectroscopy
K. Nakagawa1, S. Tsuchiya1, J. Yamada2, Y. Toda1
1Depertment of Applied Physics, Hokkaido University
Graduate School of Material Science, University of Hyogo

2

Strong electron correlation plays a key role in the exotic phenomena such as unconventional superconductivity, fluctuating electronic order and a phase separation between metal and insulator. So far,its effects have been studied in thermally equilibrium states with controlled carrier density or bandwidth. As regards the non-equilibrium states, however, which can be studied by ultrafast optical spectroscopy, electron correlation effects on them are still unclear because of a lack of systematic study.
In this study to investigate electron correlation effects on the non-equilibrium electronic states, we
performed femtosecond pump-probe spectroscopy in the strongly correlated organic molecular conductors -(BEDT-TTF)2Cu[N(CN)2]Br (-Br) and -(BEDT-TTF)2Cu(NCS)2 (-NCS), which has effectively weaker electron correlation than -Br. The pump-probe measurements were carried out using
120 fs laser pulses centered at 400 nm for a pump (63-134 J/cm2) and 800 nm for a probe extracted
from a cavity-dumped Ti:sapphire oscillator with a repetition rate of 54 kHz. The pump and probe
beams were coaxially overlapped and irradiated perpendicular to the conducting planes. The probe
polarization was rotated by a half-wave plate.
Figure 1 shows probe polarization angular dependences of R/R
in -NCS at 75 K and 60 K. At 75 K, R/R is independent of theprobe polarization, corresponding to the electronic energy relaxa-

Figure 1: Probe polarization angular dependences of R/R in -NCS
at 75 K and 60 K.

tion in the metallic state, while at it is anisotropic indicatinga broken rotational symmetry For further analysis, we extracted
the anisotropic components from R/R and their amplitudes areplotted in Figure 2 as a function of temperature for -NCS (opencircles) and -Br (closed circles). In -NCS the anisotropic component appears below about 70 K and develops steeply with lowering temperature, indicating that an energy gap opens at the Fermi
surface since R/R is proportional to photo-excited carrier density.
Contrarily, in -Br the anisotropic component shows gradual increase below around 80 K, which is qualitatively different fromthat in -NCS. A possible interpretation is that the increase of theanisotropic components in both salts corresponds to a photoinduced phase separation between metal and insulator [1] and thequalitative difference in the temperature dependences between
them can be associated with the difference in electron correlation:

Figure 2: Temperature dependences of amplitude of the anisotropic responses in -Br and -NCS.

that is, fluctuating nature can be enhanced in -Br by strong electron correlation.
[1] Y. Toda et al., Phys. Rev. Lett. 107, 227002 (2011).

Study of spin dynamics of a staircase kagome material
investigated by spin polarized muons
A

Advanced Meson Science Laboratory, RIKEN Nishina Center
B
Department of Physics, The Catholic University of Korea
C
Department of Physics, Chung-Ang University
Sungwon YoonA, B
S.-H. DoC, K.-Y. ChoiC, I. WatanabeA, B, and B. J. SuhB

PbCu3TeO7 was suggested as a new anisotropic kagome system for the staircase
kagome lattice [1]. The crystal structure of PbCu3TeO7 is an orthorhombic latticewith the space group, Pnma, No. 62. PbCu3TeO7 is composed by buckled kagome
layers of Cu2+ ions settled in the bc plane, and those layers are stacked along a axis.
In the buckled kagome layer, Cu2+ ions can be affected by the different sorts ofmagnetic exchanges caused by different environments of O2- ions, the octahedral,
and, the tetrahedral environments, respectively [1, 2].
Fig. 1 exhibits the DC magnetic susceptibility of the PbCu3TeO7 polycrystalline
sample measured at 1 kOe. It shows three distinct anomalies around 17 K, 25 K, and
36 K, and the Weiss temperature is approximately 180 K. With the comparison of
the previous susceptibility, and specificheat results [1], PbCu3TeO7 is expected
to be in the frustrated spin state due tothe competition of different sorts of
exchanges as previously mentioned.
We carried out the microscopic
investigation by using spin polarizedmuons in order to understand the natureof magnetic anomalies, and to get
information on the spin dynamics of an
Fig.1 Temperature dependence ofanisotropic kagome material. Details
magnetic susceptibility
will be reported in the presentation
including a distinguishable behavior of the phase transition at 36 K.
[1] B. Koteswararao et al., J. Phys.: Condens. Matter 25, 336003 (2013).
[2] DAI Jia et al., Chin, Phys. Lett. 32, 127503 (2015).

ESR measurements of the Valence Bond Solid material
EtMe3P[Pd(dmit)2]2
RIKEN1, Hokkaido Univ.2
Sunghyun Kim1,2, Y. Oshima1,2 and R. Kato1
The anion radical salt β’-X[Pd(dmit)2]2 (X is monovalent cation) are Mott insulators
which consist of S=1/2 triangular lattice. A wide variety of ground states such as theantiferromagnetic state, quantum spin-liquid state and charge-ordered state areobserved in β’-X[Pd(dmit)2]2 depending on the degree of geometrical frustration
controlled by the monovalent cation X [1]. Recently, a new type of anion radical salt
EtMe3P[Pd(dmit)2]2, which have a P21/m symmetry, has been synthesized.
EtMe3P[Pd(dmit)2]2 forms also a triangular lattice but its molecular stacking areslightly different with the β’-X[Pd(dmit)2]2 salts. It is known from the magnetic
susceptibility measurement that EtMe3P[Pd(dmit)2]2 turns into a valence bond solid(VBS) state at TVBS=25 K which is analogous to the spin-Peierls state [2]. ESR is oneof the sensitive probe that can deduce the energy gap between the singlet and triplet
states, ΔE, from the temperature dependence of integrated intensity. Therefore, wehave performed ESR measurements of EtMe3P[Pd(dmit)2] 2 to determine the spin gapof the VBS state.
The integrated intensity of the ESR signal, which corresponds to the spin
susceptibility, is shown in Fig. 1. Our result shows a smooth decrease below 50 K,
and only a small number of spins remain at TVBS. In contrast to the magnetic
susceptibility measurement, this suggests that the VBS order occurs at much morehigh temperature, and the ESR contributions of single spins on the Pd(dmit)2 dimer
and the excited states of VBS state can not beignored at high temperature. Therefore, we haveconsidered a model where single spins on the dimer
decrease with exp(-ΔE/kBT), and pairs of single
E S=1
spins form a singlet state and its excited state
contributes to the ESR intensity. Our result is
ΔE
S=0
well-fitted with the ΔE=135 K curve. Detailed
B
analysis of the ESR measurements will be presented
and its magnetic properties will be discussed.
[1] M. Tamura and R. Kato, Sci. Technol. Adv. Mater. 10(2009) 024304.
[2] M. Tamura, A. Nakao, and R. Kato, J. Phys. Soc. Jpn., 75(2006) 093701.

Fig. 1 Integrated intensity of the
ESR signal

Simulation of LIDAR multiple scattering in aerosol andmetamaterial perfect absorbers for remote sensing
Department of Condensed Matter Physics, Hokkaido University
International Center for Materials Nanoarchitectonics, NIMS
Doan Tung Anh
Much of our understanding of the physical properties of a medium comes from its
interaction with electromagnetic waves. Based on Mie and Rayleigh scattering
theories[1], we have proposed some algorithmic improvements in calculating single
elastic scattering parameters such as scattering cross-section, extinction coefficient andscattering phase function for arbitrary homogeneous spherical particles. Dramaticallyfaster Mie algorithms have been made possible by vector structuring and by much more
efficient handling of the scattering matrix elements’ calculation. For LIDAR (Light
Detecting and Ranging) applications, the calculations were extended to multiple
scattering simulation using Monte Carlo method to retrieve optical properties of aerosol
media such as particle density and size distributions. For deducing other important but
challenging parameters of aerosol media, such as components’ identity and temperature
profile, spectrally selective narrow-band detectors and emitters are needed.
Electromagnetic metamaterial, which is arrays of structured subwavelength elements
described as effective materials via electric permittivity ϵ(ω) and magnetic permeability
μ(ω)[2], is a promising candidate detect and emit spectrally selective signals [3][4].
Using finite integration technique, we proposed an approach to explain the underlying
physics of metamaterial cut-wire pair (CWP) isotropic perfect absorbers in microwave
and THz regime by systematically manipulating the electrically and magneticallyinduced losses[5]. In time to come, further research will be conducted to manipulate
various structures of nanoscale metamaterials to achieve
near unity absorption at desired infrared spectral bands
with wider tunability to integrate to temperature sensing
systems.
[1]C.F. Bohren, ISBN: 9780471293408, (1983)[2]J. B. Pendry et al., Phys. Rev. Lett 76, 4773 (1996).
[3] N. I. Landy et al., Phys. Rev. B 79, 125104 (2009).
[4] Claire M. Watts et al., Adv. Mater. 24, OP98–OP120 (2012).
[5 ] Doan Tung Anh et al, AIP Advances 5, 077119 (2015).

Fig1. Evolution of the absorption spectraof the proposed CWP metamaterials bytransforming square-to-diamondgeometry𝝁SR and DFT Study of Organic Superconductor 𝝀-(BETS)2GaCl4
Dita Puspita Sari1,2), Retno Asih1,2), Koichi Hiraki3), Yasuyuki Ishii4), Toshihiro Takahashi3),
Takashi Koretsune5, Hitoshi Seo5, Isao Watanabe1,6), Takehito Nakano2), and Yasuo Nozue2)
1RIKEN Nishina Center, 2Osaka U., 3Gakushuin U., 4Shibaura Institute of Technology,
5CEMS-RIKEN, 6Hokkaido University

The quasi two-dimensional organic superconductor, λ-(BETS)2GaCl4, (BGC),
is composed of conductive BETS and insulating GaCl4 layers which are alternatively
stacked. BETS molecules has fourfold quasistacking along a axes which may make aphase adjacent to superconducting phase non magnetic Mott insulator despite aprediction of antiferromagnetic spin fluctuation which occurs in most of TMTTF andET superconductors [1]. Furthermore, a recent specific heat measurement results dwave pairing symmetry [2], likely -ET-NCS superconductor. A microscopically pointof view is important in order to understand the superconducting state of BGC. Muon
spin rotation (𝜇SR) is an ideal tool for such investigation.
We have carried out transversefield 𝜇SR in fields of 30 G and 60 G, from
0.3 to 10 K and have determined thetemperature dependence of magnetic
penetration depth which indicates thepresence of nodes in the superconducting
gap. Additionally, by density functional
0.235 0.129
theory (DFT) we recalculated Fermi
surface and transfer integral of BGC tounderstand the appearance of that nodeand to understand the phase adjacent tosuperconducting phase. Figure 1 shows
Figure 1. BGC crystal in thethe transfer integral estimated from ourconducting ac plane. Transfer integral
calculations. We are going to present thevalue is reported in the unit of Ev.
more detail calculations results andanalysis to understand the lowtemperature superconducting state.
References:
1. H. Tanaka et al, J. Am. Chem. Soc., 121, 760-768 (1999).
2. S. Imajo et al, J. Phys. Soc. Jpn., 85. 043705 (2016).

Antiferromagnetic fluctuation in unconventional organic
superconductor-(BETS)2GaCl4 by 13C NMR
Takuya KOBAYASHI and Atsushi KAWAMOTO,
Department of Condensed Matter Physics, Graduate School of Science, Hokkaido University
Organic superconductor -(BETS)2GaCl4 is one of the most attractive materials in solid state physics,
suggesting Fulde—Ferrell—Larkin—Ovchinnikov (FFLO) superconducting state [1] and d-wave
superconducting gap symmetry [2]. To understand this unconventional superconducting state, thecontribution from magnetic or charge fluctuations has been suggested. NMR spectroscopy is theimportant probe to detect the magnetic fluctuations, but reliable results have not been obtained inprevious 77Se and 1H NMR measurements because of (i) the low sensitivity and broad linewidth in
Se NMR, and (ii) weak coupling of the 1H nuclei with the  conduction electrons. To overcome these77

difficulties and reveal the effect of magnetic fluctuations, we performed 13C NMR measurements for a
13

C-enriched sample.

Figure 1 shows the temperature dependence of spin-lattice relaxation rate divided by temperature
1/T1T. Above 90 K, 1/T1T increases with decreasing temperature, which can be ascribed to theCurie-like behavior (solid line in Fig. 1). In fact, our group has measured the 1/T1T of -(STF)2GaCl4
and -(ET)2GaCl4 salts, and observed the clear antiferromagnetic (AF) phase transition in
-(ET)2GaCl4 salt and increase in 1/T1T derived from the AF fluctuation down to 1.5 K in
-(STF)2GaCl4 salt [3]. Therefore, the enhancement of 1/T1T above 90 K predicted the AF fluctuation.
Below 90 K, although 1/T1T deviates from Curie-like behavior, AF fluctuation remains at low
temperature. In addition, linewidth of NMR spectra broadens below 20 K. This result suggests theinhomogeneity of local spin susceptibility, which can be understood through the charge
disproportionation

within

the

dimer

of

non-centrosymmetricsuperconductivity in -(BETS)2GaCl4
salt

is

realizedinhomogeneous

system

under

an

with

AF

fluctuation.

1/T1T (s-1K-1)

-modification. We conclude that the

0.02

0.01

[1] M. A. Tanatar et al., PRB 66, (2002)
134503, W. A. Coniglio et al., PRB 83,(2011) 224507, S. Uji et al., JPSJ 84,(2015) 104709.
[2] S. Imajo et al., JPSJ 85, 043705(2016)[3] Y. Saito et al., to be published.

0.00
0

50

100

150

200

T (K)
Fig. 1: Temperature dependence of 1/T1T. Solidline shows the temperature dependence ofCurie—Weiss expression.

Nonon-linear electric conductivity
in the SpinSpin-DensityDensity-Wave state of (TMTTF)2PF6
Dept. of Phys.,
Phys., Hokkaido Univ.
D. Chiba,
Chiba, N. Matsunaga, K. Nomura, and A. Kawamoto
Quasi-one-dimensional organic conductor (TMTCF)2X shows various electric properties
such as spin-Peierls, spin-density-wave (SDW), and superconducting phase by applying
physical and chemical pressure. In the SDW phase of TMTSF salts, which are located inhigher pressure range of the phase diagram than TMTTF salts, the non-linear electric
conductivity without temperature dependence was observed [1]. It can be described by
the Zener-type expression ݆ = ݆଴ exp(−‫ܧ‬଴ /‫)ܧ‬.
To investigate the dynamics of SDW and to clarify the differences between TMTSF salts
and TMTTF salts, we measured I-V characteristic in the SDW phase of (TMTTF)2PF6
and observed the non-linear electric conductivity. In high current region, we observed
negative differential resistance. Moreover, in higher current region, negative differential
resistance disappears and temperature independent resistance was observed. These
results imply that I-V characteristic of (TMTTF)2PF6 in high current region is understood
as well as the Zener-type current of TMTSF salts.

[1] G. Mihály, Yong Kim, and G. Grüner, Phys. Rev. Lett. 67,
67 2713 (1991)

High-pressure synthesis of new filled skutterudite compounds
SrT4As12 (T =Fe, Ru, Os)
K. Nishine, J. Sirimart, R. Nakajima, Y. Kawamura, J. Hayashi and C. Sekine
Muroran Institute of Technology, 27-1 Mizumoto-cho, Muroran, 050-8585, Japan.
Filled skutterudite compounds AT4X12 (A = alkali metal, alkaline earth metal, lanthanide (Ln),and actinide; T = Fe, Ru, Os, and Pt; X = P, As, Sb, and Ge) crystallize in a body-centered cubic
structure with a space group Im3̅ (T5h, No. 204) [1] are expected as potential thermoelectricmaterials. The compounds also exhibit various physical properties depend on combinations ofelements. While the physical properties of P and Sb-based compounds have been investigatedintensively, few studies of As-based filled skutterudite compounds have been conducted. One of
the reasons is that the compounds are quite difficult to prepare at ambient pressure.
High-pressure synthesis is a powerful technique for preparing As-based filled skutterudite
compounds. In this study, we focused on As-based filled skutterudite compounds including
alkaline earth metal as part of our search for new materials using a high-pressure synthesis
technique. Polycrystalline SrT4As12 (T=Fe, Ru, and Os) were prepared at high temperatures andhigh pressures using a Kawai-type double-stage multi-anvil high-pressure apparatus. The
samples were prepared by reacting stoichiometric amount of 3N (99.9% pure)-Sr chips, 4N-Fe,
4N-Ru, 4N-Os and 6N-As powder at 4 GPa. The reaction temperature was 830-900 °C. The
prepared samples were characterized by powder x-ray diffraction (XRD) using Co Kα1 radiationand silicon as a standard. Resistivity was measured by a standard dc four-probe method.
Magnetization and dc magnetic susceptibility were measured by a superconducting quantum
interference device magnetometer (Quantum Design MPMS). Specific heat measurement was
carried out by a thermal relaxation method (Quantum Design PPMS). The XRD results indicate
new skutterudite compounds SrT4As12(T=Fe,Ru,Os) with lattice constant of 8.351Å, 8.521Å,and 8.561Å, respectively. Resistivity and magnetic susceptibility measurements indicate
SrOs4As12 is a new superconductor around 4.8 K. The magnetic susceptibility of SrFe4As12
shows a broad peak around 50 K. A large electronic specific heat coefficient is observed. The
results suggest that SrFe4As12 is a nearly ferromagnetic metal with spin fluctuations of Fe 3delectrons.
[1] W. Jeitshko and D. Braun 1977 Acta Crystallogr., Sect. B 33 3401 (1977).

Electrical transport study of Sn-doped α-Fe2O3

Taewon Min, Sehwan Song, Sungkyun Park, Jaekwang Lee*
Department of Physics, Pusan National University, Busan 46241, Korea

Abstract
α-Fe2O3 has been known as a promising photo-anode material due to its efficient visible lightabsorption, appropriate band edges and strong stability in aqueous electrolyte. However, its
solar to hydrogen conversion efficiency is strongly limited by slow charge transport governedby the polaron hopping conduction. Here, using density functional theory calculations, we findthat the polaron hopping barrier in Sn-doped α-Fe2O3 is reduced by about 0.3 eV compared tothat in bare α-Fe2O3 with oxygen vacancy, which corresponds to around 1010 times
enhancement in electrical conductivity at room temperature. Such a remarkable effect isachieved by only 2% Sn substitution and clearly confirmed by the 4-probe measurement. Our
combined studies provide essential information for developing novel α-Fe2O3-based
photoelectrochemical(PEC) cell with high efficiency.

RIETVELD ANALYSIS OF NANOCRYSTALLIN BARIUM M-HEXAFERRITE WHICHSYNTHESIZED USING CO-PRECIPITATION METHOD
Irwan Ramli
Department of Condensed Matter Physics, Hokkaido University

Nanocrystallin Barium M-Heksaferrite has been successfully synthesized using Co-precipitation Method. The Precursor
were calcined at varied temperature to obtain good crytallin BaM. The nanocrytallin powder BaM were characterizedby X-ray diffraction techniques and Tunneling Electron Microscopy (TEM) and its magnetic properties measured byVibrating Sample Magnetometer (VSM). The Analyse crystalline phase composition in the samples performed by rietveld method using Software Rietica and MAUD . The results of your analysis of the diffraction pattern showed thatthe highest percentage of crystalline phase of BAM 94.3 (2.9)% with a crystal size of 87 (3) nm. The estimate crystalline size usinng difraction data agreed with TEM observation. Characterization of the magnetic properties showed that
BAM is a hard magnetic with coercivity field 46.0 tesla and remanence 29.3 emu/g
Keywords: co-precipitation, Rietveld, rietica, X- Ray Difraction, MAUD, TEM**

Intensitas (arbt. unit)

1000 C*+****** + *+

BaFe12O19 (PDF #39-1433)

 -Fe2O3 (PDF #33-0664)
*
*
* *
+*
+
* + * * + * * +* *+*900 C

800 C
0.005

0.004

700 C

15

20

25

Frekuensi

500 C350 C
Prekursor
30

35

40

45

50

55

60

2 ()

Fig 1. XRD Pattern of Barium M-Hexaferrite

65

70

0.003

0.002

0.001

0.000

0

200

400

600

800

1000

1200

Ukuran Kristal (nm)Fig 2. Crystal size from TEM observation and Rietveld Analysis

References:[1] R. C. Pullar, Progress in Materials Science, vol. 57, no. 7, pp. 1191–1334.
[2] D. L. Bish and S. A. Howard, Journal of Applied Crystallography, vol. 21, no. 2, pp. 86–91.
[3] E. H. Kisi, Materials Forum, vol. 18, pp. 135–153.
[4] K. S. Martirosyan, et.al, Materials Science and Engineering: B, vol. 176, no. 1, pp. 8–13.