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Low Temperature and Materials Sciences (Kyoto University)
Number 13, DECEMBER 2008

Table of Contents
Research Reports
Josephson Plasma Excitations in Intrinsic Josephson Junctions of High-Tc Superconductors••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••Itsuhiro Kakeya •••3
59

Co-NMR/NQR studies on the itinerant ferromagnetic superconductor UCoGe••••••••••••••••••••••••••••••••••••••••• Tetsuya Ohta, Yusuke Nakai, Kenji Ishida•••10

Quantum phase transitions in heavy fermion CeRu2Si2 and its related compounds••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• Yoshikazu Tabata•••18

Technical Note
OPENCORE NMR Spectrometer: Open-source core modules for implementing
an integrated FPGA-based NMR spectrometer••••••••••••••••••••• Kazuyuki Takeda•••24

From the LTM Center
New Research Building for Research Center for Low Temperature and Materials Sciences•••••••••••••••••••••••••••••••• Anju Sawada, Takahito Terashima, Hideki Yamochi•••30

LTM Center Seminars••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••36
From Organizing Committee
Amounts of Cryogen Consumptions : Yoshida Campus, Uji Campus and Katsura Campus••••38
Research staffs of the LTM center •••••••••••••••••••••••••••••••••••••••••••••••••••••••••40

Call for Manuscript•••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••41
Editor’s Note•••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••422

研究ノート()*+,-./0123456789:;<=>?@A
Josephson Plasma Excitations in Intrinsic Josephson Junctions of High-Tc
Superconductors
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Itsuhiro Kakeya
Graduate School of Engineering, Kyoto University
Studies on excitations of electromagnetic waves inside Bi2Sr2CaCu2O8+!"intrinsic Josephson junctions aredescribed. Josephson vortices introduced between their superconductive CuO2 layers severely couple with theexcited Josephson plasma modes and result in the dominant factor for their propagating vector. Emission of theJosephson plasma was confirmed in the absence of applied magnetic field. This stimulates developments ofcompact superconducting THz sources in future.
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B&C&D&E&[1]

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59

Co-NMR/NQR studies on the itinerant ferromagnetic superconductor UCoGe
KLMN, PQRS, TLUV¡¢K~K~£ ¬~•€},
Tetsuya Ohta, Yusuke Nakai, Kenji Ishida
Graduate School of Science, Kyoto University,

We have investigated the itinerant ferromagnetic superconductor UCoGe by using 59Co-NMR and nuclear
quadrupole resonance (NQR). The 59Co-NQR spectrum below the ferromagnetic-transition temperature revealed
the phase separation between ferromagnetic and paramagnetic phases. Furthermore, the superconducting
anomaly was observed in 1/T1 measured in both phases, indicating that ferromagnetism and superconductivity
coexist microscopically at the ferromagnetic phase.
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11

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15

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17

WXYZ[ CeRu2Si2 \]^_`abc89:;dZefg
Quantum phase transitions in heavy fermion CeRu2Si2 and its related compounds
Lhij¡¢K~K~£¤~•€}•Y¤~•¥
Yoshikazu Tabata
Graduate School of Engineering, Kyoto University
CeRu2Si2 is a canonical heavy fermion compound exhibiting no long-range magnetic order nor superconductivity.
However, CeRu2Si2 has dynamic antiferromagnetic correlations with three different magnetic wave vectors,
k1=(0.3,0,0), k2=(0.3,0.3,0) and k3=(0,0,0.35), and reveals nonmagnetic-magnetic quantum phase transitions by
substitution of the constituent elements. In this report, recent neutron scattering investigations of quantum phasetransitions in heavy fermion CeRu2Si2 and its related compounds are presented.
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18

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19

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BCDE[1] S. Sachedev, “Quantum Phase Transitions” (Cambridge University Press)[2] J. A. Hertz, Phys. Rev. B 14, 1165 (1976).
[3] M. Suzuki, Prog. Teor. Phys. 56, 1454 (1976).
[4] H. v. Löhneysen et al., Rev. Mod. Phys. 79, 1015 (2007).
[5] S. Kambe et al., J. Phys. Soc. Jpn. 65, 3294 (1996).
[6] A. Schröder et al., Nature (London) 407, 351 (2000).
[7] H. Kadowaki, Y. Tabata et al., Phys. Rev. Lett. 96, 016401 (2006).
[8] Y. Tabata et al., Proceedings of the international symposium on Topological aspects of critical systems andnetworks (World Scientific), 166 (2007). C. Kanadani et al., J. Magn. Magn. Mater. 310, 357 (2007).
[9] P. Haen et al., J. Low Temp. Phys. 67, 391 (1987).
[10] L. P. Regnault et al., Phys. Rev. B 38, 4481 (1988).
[11] H. Kadowaki et al., Phys. Rev. Lett. 92, 097204 (2004).
[12] S. Kawarazaki et al., J. Phys. Soc. Jpn. 66, 2473 (1997).
[13] Q. Si et al., Nature (London) 413, 804 (2001).
[14] H. Kadowaki et al., Phys. Rev. Lett. 101, 096406 (2008).
FGHIz‹Œ •D (Yoshikazu Tabata)Ž••‘•‘’“‘”•–—˜“‘™šŒ ›œ•
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技術ノートFPGA opq NMR uvjÏOPENCORE NMR SpectrometerÐ_wx
OPENCORE NMR Spectrometer: Open-source core modules for implementing
an integrated FPGA-based NMR spectrometer
yLz{¡¢K~K~£¬~•€}
Kazuyuki Takeda
Graduate School of Science, Kyoto University"
One possible design of a home-built NMR spectrometer is presented, in which a Field-ProgrammableGate-Array (FPGA) is fully exploited. An FPGA is an LSI composed of a large number of programmable logic
gates, in which digital circuits called the "core modules" can be built by writing hardware description codes. In
principle, an FPGA can realize any digital circuits within limitations set by the available number of logic
elements and the operation speed. In this work, a single FPGA chip is let do all the digital jobs required for an
NMR spectrometer. It is shown that a handy and operational three-channel NMR spectrometer can be built by
combining the core modules for the digital NMR spectrometer with non-digital peripheral components. These
core modules as well as circuit diagrams, board designs, etc., are freely available on
http://kuchem.kyoto-u.ac.jp/bun/indiv/takezo/opencorenmr/index.html. By letting these information open to
public, I encourage the potential users not only to utilize this spectrometer, referred to as the OPENCORE NMR
spectrometer (after the "open" "core" modules), but also to modify it so as to meet their own needs. A home-built
spectrometer serves a complementary role to the sophisticated commercial spectrometer when one needs tomodify the hardware inside the spectrometer in order to put new ideas into practice. Let us promote new andexciting NMR works!
HU

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2008&8'ø…OOPENCORE NMR Spectrometer¦ñI_Œ«Ð;•€þÙ3*Oñ·K#K~K~£'ž¤~•€}™dZ\j·;4˜•€þ89Xµï3*O^Æµ˜4˜™Om‚È¬¥¤}K~_.
-NMR•(‚<Ù1*:ØÆµ9ÇONMRuv~_ƒ¤w²!•Æ·^¼m¼ºT_•€²”½Ð;_8Dd;CµXñÐ¸•# ž# Ÿ##[1] K. Takeda, OPENCORE NMR: Open-source core modules for implementing an integrated FPGA-based
NMR spectrometer, Journal of Magnetic Resonance, 192, 218, 2008.
[2] K. Takeda, A highly integrated FPGA-based nuclear magnetic resonance spectrometer, Review of
Scientific Instruments, 78, 033103, 2007.
[3] http://kuchem.kyoto-u.ac.jp/bun/indiv/takezo/opencorenmr/index.html
HUU[4] W.K. Peng, K. Takeda, M. Kitagawa, A new technique for cross polarization in solid-state NMR compatible
with high spinning frequencies and high magnetic fields, Chemical Physics Letters, 417, 58, 2006.
[5] W.K. Peng, K. Takeda, Efficient cross polarization with simultaneous adiabatic frequency sweep on thesource and target channels, Journal of Magnetic Resonance, 188, 267, 2007.
[6] A. Lesage, L. Duma, D. Sakellariou, L. Emsley, Improved resolution in proton NMR spectroscopy of
powdered solids, Journal of the American Chemical Society, 123, 5747, 2001.

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