研究者詳細 - 小林　義明

論文 - 小林　義明

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Site-selective observation of spin dynamics of a Tomonaga-Luttinger liquid in frustrated Heisenberg chains 査読有り

Nguyen, Diep Minh and Temurjonov, Azimjon A. and Hirai, Daigorou and Hiroi, Zenji and Janson, Oleg and Yasuoka, Hiroshi and Matsushita, Taku and Kobayashi, Yoshiaki and Shimizu, Yasuhiro

Physical Review B 111 巻 ( 6 ) 頁： 064423-1 - 064423-11 2025年2月

75As Nuclear Spin–Spin Relaxation Measurement in Iron-Pnictide Superconductor Ba0.66K0.34Fe2As2 査読有り

Yoshihiko Ota, Taku Matsushita, Shigeyuki Ishida, Akira Iyo, Hiroshi Eisaki, and Yoshiaki Kobayashi

Journal of the Physical Society of Japan 93 巻頁： 044711-1 - 044711-7 2024年4月

Spin Dynamics Studied by 77Se Nuclear Spin-Echo Decay Measurements in FeSe 査読有り

Yoshihiko Ota, Taku Matsushita, Hiromasa Kobayashi, and Yoshiaki Kobayashi

Journal of the Physical Society of Japan 93 巻頁： 033701-1 - 033701-4 2024年2月

Multipole Fluctuation of Iron Pnictide Superconductor Ba(Fe1−xCox)2As2 査読有り

Haruyasu Sato, Mitsuhiro Akatsu, Yuichi Nemoto, Terutaka Goto, Ryosuke Kurihara, Keisuke Mitsumoto, Yoshiaki Kobayashi, and Masatoshi Sato

JPS Conference Proceedings 30 巻頁： 011052-1 - 011052-6 2020年

In-plane anisotropy of the electric field gradient in Ba(Fe1-xCox)(2)As-2 observed by As-75 NMR

Toyoda Masayuki, Ichikawa Akihiro, Kobayashi Yoshiaki, Sato Masatoshi, Itoh Masayuki

PHYSICAL REVIEW B 97 巻 ( 17 ) 2018年5月

X-ray diffraction study of spontaneous strain in the iron-based superconductor Sr4V2Fe2As2O6-delta 査読有り

Saito Masahiro, Fujishita Hideshi, Okamoto Hiroyuki, Kobayashi Yoshiaki, Sato Masatoshi

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS 519 巻頁： 142 - 146 2015年12月

Poisoning effect of Mn in LaFe1-xMnxAsO0.89F0.11: Unveiling a quantum critical point in the phase diagram of iron-based superconductors

Hammerath, F; Bonfà, P; Sanna, S; Prando, G; De Renzi, R; Kobayashi, Y; Sato, M; Carretta, P

PHYSICAL REVIEW B 89 巻 ( 13 ) 2014年4月

Phase separation of antiferromagnetism and superconductivity in Rb x Fe2-y Se2 observed by using Rb NMR

Kobayashi, Y; Saiki, S; Kototani, S; Itoh, M; Sato, M

JOURNAL OF THE KOREAN PHYSICAL SOCIETY 63 巻 ( 3 ) 頁： 448 - 452 2013年8月

On the superconducting symmetry of Fe-based systems - Impurity effect studies and neutron scattering measurements

Sato, M; Kobayashi, Y; Kawamata, T; Yasui, Y; Suzuki, K; Itoh, M; Kajimoto, R; Ikeuchi, K; Arai, M; Bourges, P

JOURNAL OF THE KOREAN PHYSICAL SOCIETY 62 巻 ( 12 ) 頁： 1726 - 1733 2013年7月

Onset of magnetism in optimally electron-doped LFe1-xRuxAsO1-yFy (L = La, Nd, or Sm) superconductors around x=1/4

Sanna, S; Carretta, P; De Renzi, R; Prando, G; Bonfà, P; Mazzani, M; Lamura, G; Shiroka, T; Kobayashi, Y; Sato, M

PHYSICAL REVIEW B 87 巻 ( 13 ) 2013年4月

On the superconducting pairing mechanism of Fe-based systems-Is it new or well-known ?

Sato, M; Kobayashi, Y

SOLID STATE COMMUNICATIONS 152 巻 ( 8 ) 頁： 688 - 694 2012年4月

X-ray diffraction study of spontaneous strain in Fe-pnictide superconductor, NdFeAsO0.89F0.11

Fujishita H., Hayashi Y., Saito M., Unno H., Kaneko H., Okamoto H., Ohashi M., Kobayashi Y., Sato M.

EUROPEAN PHYSICAL JOURNAL B 85 巻 ( 2 ) 2012年2月

Study of Ni-Doping Effect of Specific Heat and Transport Properties for LaFe1-yNiyAsO0.89F0.11

Kawamata, T; Satomi, E; Kobayashi, Y; Itoh, M; Sato, M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 80 巻 ( 8 ) 2011年8月

On the Magnetic Excitation Spectra of Ba(Fe0.9Co0.1)2As2 in the Superconducting State

Sato, M; Tatematsu, S; Yasui, Y; Kobayashi, Y; Moyoshi, T; Motoya, K; Kakurai, K

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 80 巻 2011年1月

Successive magnetic transitions of the kagome staircase compound Co3V2O8 studied in various magnetic fields

Yasui, Y; Kobayashi, Y; Soda, M; Moyoshi, T; Sato, M; Igawa, N; Kakurai, K

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 76 巻 ( 3 ) 2007年3月

Structural studies of the pyrochlore-related spin-1/2 system Ag2Cu2O3

Uematsu, D; Soda, M; Kobayashi, Y; Sato, M; Igawa, N; Kakurai, K

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 310 巻 ( 2 ) 頁： E387 - E388 2007年3月

Studies of magnetic behavior of spin-1/2 frustrated system Hg2Cu2F6S

Kawabata, S; Yasui, Y; Kobayashi, Y; Sato, M; Igawa, N; Kakurai, K

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 310 巻 ( 2 ) 頁： 1295 - 1296 2007年3月

Observation of the in-plane ordering of D2O molecules in NaxCoO2 • yD2O by neutron diffraction

Moyoshi, T; Yasui, Y; Soda, M; Kobayashi, Y; Sato, M; Kakurai, K

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 310 巻 ( 2 ) 頁： 654 - 656 2007年3月

Transport and magnetic studies on the spin state transition of Pr1-xCaxCoO3 up to high pressure

Fujita, T; Miyashita, T; Yasui, Y; Kobayashi, Y; Sato, M; Nishibori, E; Sakata, M; Shimojo, Y; Igawa, N; Ishii, Y; Kakurai, K; Adachi, T; Ohishi, Y; Takata, M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 73 巻 ( 7 ) 頁： 1987 - 1997 2004年7月

Magnetic structure of Cu0.3Zn0.7Cr2Se4

Iikubo, S; Ohno, Y; Kobayashi, Y; Yasui, Y; Ito, M; Soda, M; Sato, M; Kakurai, K

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 73 巻 ( 4 ) 頁： 1023 - 1030 2004年4月

Study on pseudo gap formation in Cu-oxides at high temperatures

Sato, M; Harashina, H; Takeda, J; Yoshii, S; Kobayashi, Y; Kakurai, K

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS 62 巻 ( 1-2 ) 頁： 7 - 13 2001年1月

Pseudo gap formation and related phenomena in Cu-oxides and other systems

Sato, M; Harashina, H; Kobayashi, Y; Kodama, K; Takeda, J; Ueda, E; Shamoto, S; Kakurai, K; Nishi, M

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS 60 巻 ( 8-9 ) 頁： 1013 - 1017 1999年8月

V-51-NMR studies on the spin dynamics of S=1/2 zig-zag chains of VO5 pyramids

Kobayashi Y, Fukamachi T, Kanada M, Harashina H, Tanaka S, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 68 巻 ( 1 ) 頁： 273 - 278 1999年1月

Observation of Ferro-Quadrupole Quantum Criticality in Iron Pnictide Superconductor Ba(Fe1−xCox)2As2 招待有り査読有り

Haruyasu Sato, Mitsuhiro Akatsu, Ryosuke Kurihara, Yoshiaki Kobayashi, and Yuichi Nemoto

Journal of the Physical Society of Japan 92 巻 ( 12 ) 頁： 124710-1 - 124710-12 2023年11月

NMR Evidence for Majorana Gap in the Kitaev Quantum Spin Liquid 査読有り

Junya Yamamoto, Yuya Nagai, Takaaki Jinno, Yasuhiro Shimizu, Taku Matsushita,Yoshiaki Kobayashi, Masayuki Itoh, Joji Nasu, Yukitoshi Motome

JPS Conf. Proc. 38 巻頁： 011130-1 - 011130-5 2023年

Tailoring a new oxyhydride, CaVO3-xHx, with ordered hydride anions 招待有り査読有り

Yutaka Ueda, Yoshiaki Kobayashi, Masayuki Itoh

Journal of Solid State Chemistry 24 巻頁： 122685 2021年10月

Ultralow-energy magnon anomaly in yttrium iron garnet 査読有り

Shamoto Shin-ichi, Yasui Yukio, Matsuura Masato, Akatsu Mitsuhiro, Kobayashi Yoshiaki, Nemoto Yuichi, Ieda Jun'ichi

PHYSICAL REVIEW RESEARCH 2 巻 ( 3 ) 2020年8月

Successive magnetic transitions and spin structure in the two-leg ladder compound CsFe2Se3 observed by Cs-133 and Se-77 NMR 査読有り

Murase Mina, Okada Kaoru, Kobayashi Yoshiaki, Hirata Yasuyuki, Hashizume Kazuki, Aoyama Takuya, Ohgushi Kenya, Itoh Masayuki

PHYSICAL REVIEW B 102 巻 ( 1 ) 2020年7月

Observation of a Novel Phase Transition in Sr(7)Re(4)O19 査読有り

Ueda Yutaka, Murase Mina, Kobayashi Yoshiaki, Itoh Masayuki, Yajima Takeshi, Yamaguchi Tomoki, Takahashi Ryo, Sugimoto Koudai, Ohta Yukinori

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 89 巻 ( 5 ) 2020年5月

Local structure study of the iron-based systems of BaFe2As2 and LiFeAs by X-ray PDF and XAFS analyses

Li S., Toyoda M., Kobayashi Y., Itoh M., Ikeuchi K., Yoneda Y., Otani A., Matsumura D., Asano S., Mizuki J., Sato M.

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS 555 巻頁： 45 - 53 2018年12月

Magnetic excitation and local magnetic susceptibility of the excitonic insulator Ta2NiSe5 investigated by Se-77 NMR

Li Shang, Kawai Shunsuke, Kobayashi Yoshiaki, Itoh Masayuki

PHYSICAL REVIEW B 97 巻 ( 16 ) 2018年4月

Nematic fluctuations in iron arsenides NaFeAs and LiFeAs probed by As-75 NMR

Toyoda Masayuki, Kobayashi Yoshiaki, Itoh Masayuki

PHYSICAL REVIEW B 97 巻 ( 9 ) 2018年3月

Critical Slowing Down of Quadrupole and Hexadecapole Orderings in Iron Pnictide Superconductor

Kurihara Ryosuke, Mitsumoto Keisuke, Akatsu Mitsuhiro, Nemoto Yuichi, Goto Terutaka, Kobayashi Yoshiaki, Sato Masatoshi

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 86 巻 ( 6 ) 2017年6月

Fast recovery of the stripe magnetic order by Mn/Fe substitution in F-doped LaFeAsO superconductors 査読有り

Moroni M., Carretta P., Allodi G., De Renzi R., Gastiasoro M. N., Andersen B. M., Materne P., Klauss H. -H., Kobayashi Y., Sato M., Sanna S.

PHYSICAL REVIEW B 95 巻 ( 18 ) 頁： 180501 2017年5月

Metal-insulator transition and magnetic fluctuations in polycrystalline Ru1-xRhxP investigated by P-31 NMR 査読有り

Li Shang, Kobayashi Yoshiaki, Itoh Masayuki, Hirai Daigorou, Takagi Hidenori

PHYSICAL REVIEW B 95 巻 ( 15 ) 頁： 155137 2017年4月

Local electronic state in the half-metallic ferromagnet CrO2 investigated by site-selective 53Cr NMR measurements 査読有り

Hikaru Takeda, Yasuhiro Shimizu, Yoshiaki Kobayashi, Masayuki Itoh, Takaaki Jin-no, Masahiko Isobe, Yutaka Ueda, Sho Yoshida, Yuji Muraoka, Takayoshi Yokoya

PHYSICAL REVIEW B 93 巻 ( 23 ) 頁： 235129 2016年6月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

We have made 53Cr NMR measurements on polycrystalline and single-crystalline film samples to study the local electronic state of a half-metallic ferromagnet CrO2 which has the rutile structure with one crystallographically equivalent Cr site. We observe two kinds of
53Cr NMR spectra in the ferromagnetic state of both the samples. An analysis on the hyperfine field shows the presence of two Cr sites with different orbital occupancies, suggesting that a local orbital order takes place with breaking the local symmetry in the rutile structure. This may be ascribed to the negative charge transfer between chromium and oxygen ions.

DOI： 10.1103/PhysRevB.93.235129

Phonons of Fe-based superconductor Ca10Pt4As8(Fe1-xPtxAs)10 査読有り

K. keuchi, Y. Kobayashi, K. Suzuki, M. Itoh, R. Kajimoto, P. Bourges, A. D. Christianson, H. Nakamura, M. Machida, M. Sato

JOURNAL OF PHYSICS-CONDENSED MATTER 27 巻 ( 46 ) 頁： 465701 2015年11月

Enhancement of low-frequency fluctuations and superconductivity breakdown in Mn-doped La1-yYyFeAsO0.89F0.11 superconductors 査読有り

F. Hammerath, M. Moroni, L. Bossoni, S. Sanna, R. Kappenberger, S. Wurmehl, A. U. B. Wolter, M. A. Afrassa, Y. Kobayashi, M. Sato, B. Buchner, P. Carretta

PHYSICAL REVIEW B 92 巻 ( 2 ) 頁： 020505 2015年7月

Identification of Various Coexisting Phases in Superconducting and Non-superconducting Samples of RbxFe2-ySe2

Kobayashi Yoshiaki, Kototani Shohei, Ohishi Kazuki, Itoh Masayuki, Hoshikawa Akinori, Ishigaki Toru, Sato Masatoshi

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 84 巻 ( 4 ) 2015年4月

Detailed Study of the Phase Diagram of Fe-based Superconductor Ba (Fe1-x Co x) 2As2 by Super High-Resolution Neutron Diffraction Measurements 招待有り査読有り

K Ikeuchi, M Sato, S Li, M Toyoda, Y Kobayashi, M Itoh, P Miao, S Torii, Y Ishikawa, T Kamiyama

Journal of Physics: Conference Series 592 巻 ( 1 ) 頁： 012071_1 - 012071_5 2015年3月

Identification of Various Coexisting Phases in Superconducting and Non-superconducting Samples of RbxFe2-ySe2 査読有り

Yoshiaki Kobayashi, Shohei Kototani, Kazuki Ohishi, Masayuki Itoh, Akinori Hoshikawa, Toru Ishigaki, Masatoshi Sato

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 84 巻 ( 4 ) 頁： 044710 2015年

Phonons and Spin Excitations in Fe-Based Superconductor Ca10Pt4As8(Fe1-xPtxAs)10 (x~0.2) 査読有り

K. Ikeuchi, M. Sato, R. Kajimoto, Y. Kobayashi, K. Suzuki, M. Itoh, P. Bourges, A. D. Christianson, H. Nakamura, and M. Machida

JPS Conf. Proc. 3 巻頁： 015043-(1-6) 2014年6月

On the Superconducting Symmetry of Fe-Based Systems -Impurity Effects and Microscopic Magnetic Behavior- 査読有り

M. Sato, K. Ikeuchi, R. Kajimoto, Y. Kobayashi, Y. Yasui, K. Suzuki, M. Itoh, M. Nakamura, Y. Inamura, M. Arai, P. Bourges, A. D. Christianson, H. Nakamura, and M. Machida

JPS Conf. Proc. 1 巻頁： 014007-(1-12) 2014年3月

Poisoning effect of Mn in LaFe1-xMnxAsO0.89F0.11: Unveiling a quantum critical point in the phase diagram of iron-based superconductors 査読有り

F. Hammerath, P. Bonfa, S. Sanna, G. Prando, R. D. Renzi, Y. Kobayashi, M. Sato, and P. Carretta

Phys. Rev. B 89 巻頁： 134503 2014年3月

Spin disorder in an Ising honeycomb chain cobaltate

Igarashi Hirokazu, Shimizu Yasuhiro, Kobayashi Yoshiaki, Itoh Masayuki

PHYSICAL REVIEW B 89 巻 ( 5 ) 2014年2月

Spin disorder in an Ising honeycomb chain cobaltate 査読有り

Hirokazu Igarashi, Yasuhiro Shimizu, Yoshiaki Kobayashi, and Masayuki Itoh

Phys. Rev. B 89 巻頁： 054431-(1-5) 2014年2月

75As NQR and NMR Studies on the Superconducting State of Ca10Pt4As8(Fe1-xPtxAs)10 査読有り

Y. Kobayashi, T. Iida, K. Suzuki, T. Kawamata, M. Itoh, and M. Sato

J. Phys. Soc. Jpn. 83 巻 ( 1 ) 頁： 014712-(1-6) 2013年12月

Phase Separation of Antiferromagnetism and Superconductivity in RbxFe2-ySe2 Observed by using Rb NMR 査読有り

Y. Kobayashi, S. Saiki, S. Kototani, M. Itoh, and M. Sato

Journal of the Korean Physical Society 63 巻頁： 448-452 2013年9月

In-plane Anisotropy of the Magnetic and the Electric Properties of the Fe Pnictide Ba(Fe1-xCox)2As2

Y. Kobayashi, A. Ichikawa, M. Toyoda, M. Itoh, and M. Sato

Journal of the Korean Physical Society 63 巻頁： 481-485 2013年9月

Magnetism and superconductivity in Rb (x) Fe2-y Se-2

Ohishi Kazuki, Sato Masatoshi, Kototani Shouhei, Saiki Shunsuke, Kobayashi Yoshiaki, Itoh Masayuki

JOURNAL OF THE KOREAN PHYSICAL SOCIETY 62 巻 ( 12 ) 頁： 1994 - 1996 2013年7月

Magnetism and superconductivity in RbxFe2-ySe2 査読有り

Kazuki Ohishi, Masatoshi Sato, Shouhei Kototani, Shunsuke Saiki, Yoshiaki Kobayashi, Masayuki Itoh

Journal of the Korean Physical Society 62 巻 ( 12 ) 頁： 1994-1996 2013年

On the superconducting symmetry of Fe-based systems - Impurity effect studies and neutron scattering measurements 査読有り

Masatoshi Sato, Yoshiaki Kobayashi, Takayuki Kawamata, Yukio Yasui, Kazunori Suzuki, Masayuki Itoh,. Ryoichi Kajimoto, Kazuhiko Ikeuchi, Masatoshi Arai, Phillipe Bourges

Journal of the Korean Physical Society 62 巻 ( 12 ) 頁： 1726-1733 2013年

Onset of magnetism in optimally electron-doped LFe1-xRuxAsO1-yFy (L = La, Nd, or Sm) superconductors around x=1/4,

S. Sanna, P. Carretta, R. De Renzi, G. Prando, P. Bonfà, M. Mazzani, G. Lamura, T. Shiroka, Y. Kobayashi, and M. Sato

Phys. Rev. B 87 巻頁： 134518-(1-6) 2013年

On the superconducting pairing mechanism of Fe-based systems-Is it new or well-known? 査読有り

M. Sato and Y. Kobayashi

Solid State Communications 152 巻 ( 8 ) 頁： 688–694 2012年8月

X-ray diffraction study of spontaneous strain in Fe-pnictide superconductor, NdFeAsO0.89F0.11 査読有り

H. Fujishita, Y. Hayashi, M. Saito, H. Unno, H. Kaneko, H. Okamoto, M. Ohashi, Y. Kobayashi, M. Sato

European Physical Journal B 85 巻 ( 2 ) 頁： 52 2012年2月

Study of magnetic excitation spectra of several Fe-pnictide systems 査読有り

M Sato, T Kawamata, Y Kobayashi, Y Yasui, T Iida, K Suzuki, M Itoh, T Moyoshi, K Motoya, R Kajimoto, M Nakamura, Y Inamura and M Arai

Journal of Physics: Conference Series 400 巻頁： 022105 2012年

Impurity effects on the superconducting transition temperatures of Fe pnictides and superconducting symmetry of the order parameter 査読有り

M. Sato, Y. Kobayashi, S. Satomi, T. Kawamata and M. Itoh

Journal of Physics: Conference Series 400 巻頁： 022104 2012年

NMR Studies on Iron Pnictide Superconductors of LaFeAsO0.89F0.11 and Ca-Fe-Pt-As 査読有り

Y. Kobayashi, T. Iida, K. Suzuki, E. Satomi, T. Kawamata, M. Itoh, and M. Sato

Journal of Physics: Conference Series 400 巻頁： 022056 2012年

Absence of Magnetic Order in Ising Honeycomb-Lattice Ba3Co2O6(CO3)(0.7)

Igarashi Kazuhiro, Shimizu Yasuhiro, Satomi Erika, Kobayashi Yoshiaki, Takami Tsuyoshi, Itoh Masayuki

26TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT26), PTS 1-5 400 巻 2012年

NMR Studies on Iron Pnictide Superconductors of LaFeAsO0.89F0.11 and Ca-Fe-Pt-As

Kobayashi Y., Iida T., Suzuki K., Satomi E., Kawamata T., Itoh M., Sato M.

26TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT26), PTS 1-5 400 巻 2012年

Magnetic Excitation Spectra of Superconducting Ca-Fe-Pt-As System 査読有り

M. Sato, T. Kawamata, Y. Kobayashi, Y. Yasui, Takefumi Iida, Kazunori Suzuki, Masayuki Itoh, Taketo Moyoshi, Kiyoichiro Motoya, Ryoichi Kajimoto, Mitsutaka Nakamura, Yasuhiro Inamura, and Masatoshi Arai

Journal of the Physical Society of Japan 80 巻頁： 093709-(1-4) 2011年

Study of Ni-Doping Effect of Specific Heat and Transport Properties for LaFe1-yNiyAsO0.89F0.11 査読有り

T. Kawamata, E. Satomi, Y. Kobayashi, M. Itoh, and M. Sato

Journal of the Physical Society of Japan 80 巻頁： 084720-(1-5) 2011年

Crystal Structure of New Pt-Doped Fe Pnictide Superconductors 査読有り

80 巻頁： 073710-(1-3) 2011年

Magnetic Ordering in V-Layers of the Superconducting System of Sr2VFeAsO3 査読有り

S. Tatematsu, E. Satomi, Y. Kobayashi, and M. Sato

J. Phys. Soc. Jpn. 79 巻 ( 12 ) 頁： 123712-(1-4) 2010年12月

Distinct physical behaviors of LaFe1-yCoyAsO0.89F0.11 between the superconducting and nonsuperconducting metallic regions of y divided by y similar to 0.05

Sato M., Kobayashi Y., Lee S. C., Takahashi H., Moyoshi T.

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS 470 巻頁： S475 - S477 2010年12月

On the non-superconducting state in the phase diagram of NaxCoO2 center dot yH(2)O

Sato Masatoshi, Kobayashi Yoshiaki, Moyoshi Taketo

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS 470 巻頁： S752 - S754 2010年12月

NMR studies on the superconducting symmetry of iron pnictide systems

Kobayashi Yoshiaki, Lee Sang Chul, Takahashi Hidefumi, Moyoshi Taketo, Sato Masatoshi

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS 470 巻頁： S472 - S474 2010年12月

Magnetic excitations of superconducting LaFeAsO0.89F0.11

Moyoshi T., Lee S. C., Tatematsu S., Yasui Y., Kobayashi Y., Sato M., Kakurai K.

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS 470 巻頁： S470 - S471 2010年12月

Studies on the superconducting state of NaxCoO2 center dot yH(2)O - Overview

Sato Masatoshi, Kobayashi Yoshiaki, Moyoshi Taketo

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS 470 巻頁： S673 - S677 2010年12月

⁷⁵As-NMR Studies of LaFeAsO_1-xF_x for Various x Values 査読有り

Yoshiaki Kobayashi, Erika Satomi, Sang Chul Lee, and Masatoshi Sato

Journal of the Physical Society of Japan 79 巻 ( 9 ) 頁： 093709-(1-4) 2010年9月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Results of ⁷⁵As NMR and NQR measurements are reported for superconducting samples of LaFeAsO_1-xF_Rx with various x values. The x dependent widths of the superconducting transition and those of the NQR spectra indicate that the optimally doped LaFeAsO_1-xF_x sample with the superconducting transition temperature T_c=28 K has the smallest width or smallest inhomogeneity of the superconducting order parameter Δ. In the analyses of the temperature (T) dependence of the NMR longitudinal relaxation rate 1/T₁, we have tried to use a simple relation 1/T₁~Tⁿ to see how fast 1/T₁ decreases when the superconducting order parameter grows. The relation holds rather well in the T region of ~0.3T_c<T=<T_c, and n varies from 2.5-6 with varying x, having the maximum value 5-6 at the optimal x. These results indicate that the x dependence of n originates from the spatial distribution of Δ, and that the T^5-6 behavior is considered to be intrinsic to this system.

DOI： 10.1143/JPSJ.79.093709

Superconducting Transition Temperatures and Transport Properties of LaFe1-yRuyAsO0.89F0.11 and LaFeAsO0.89-xF0.11+x 査読有り

Satomi Erika, Lee Sang Chul, Kobayashi Yoshiaki, Sato Masatoshi

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 79 巻 ( 9 ) 頁： 094702 (6 pages) 2010年9月

High-Temperature Multiferroic State of RBaCuFeO5 (R = Y, Lu, and Tm)

Kawamura Yuji, Kai Takahiro, Satomi Erika, Yasui Yukio, Kobayashi Yoshiaki, Sato Masatoshi, Kakurai Kazuhisa

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 79 巻 ( 7 ) 2010年7月

Superconducting transition temperature and the thickness of CoO2 planes of NaxCoO2 center dot yH(2)O

Moyoshi Taketo, Kobayashi Yoshiaki, Yasui Yukio, Sato Masatoshi, Kakurai Kazuhisa

SOLID STATE SCIENCES 12 巻 ( 5 ) 頁： 656 - 659 2010年5月

Effects of Ru Doping on the Transport Behavior and Superconducting Transition Temperature of NdFeAsO0.89F0.11 査読有り

Lee Sang Chul, Satomi Erika, Kobayashi Yoshiaki, Sato Masatoshi

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 79 巻 ( 2 ) 頁： 023702-(1-4) 2010年2月

Studies on Effects of Impurity Doping and NMR Measurements of La 1111 and/or Nd 1111 Fe-Pnictide Superconductors 査読有り

Sato Masatoshi, Kobayashi Yoshiaki, Lee Sang Chul, Takahashi Hidefumi, Satomi Erika, Miura Yoko

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 79 巻 ( 1 ) 頁： 014710-(1-10) 2010年1月

NMR studies on the superconducting symmetry of iron pnictide systems 査読有り

Y. Kobayashi, S.C. Lee, H. Takahashi, T. Moyoshi, M. Sato

Physica C: Superconductivity 470 巻頁： S472-S474 2010年

Studies on Effects of Impurity Doping and NMR Measurements of La 1111 and/or Nd 1111 Fe-Pnictide Superconductors 査読有り

Masatoshi Sato, Yoshiaki Kobayashi, Sang Chul Lee, Hidefumi Takahashi, Erika Satomi, and Yoko Miura

Journal of the Physical Society of Japan 79 巻 ( 1 ) 頁： 014710 2009年12月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Measurements of the electrical resistivity rho, Hall coefficient RH, thermoelectric power S, and the electronic specific heat coefficient gamma have been carried out for samples of LnFe1-yMyAsO1-xFx (Ln=La, Nd; M=Co, Mn; x=0.11) obtained by doping M atoms into the superconducting LnFeAsO1-xFx (Ln 1111) system. The NMR longitudinal relaxation rate 1/T1 has also been measured for samples of LaFe1-yCoyAsO1-xFx with various x values. Co atoms doped into the superconducting LnFeAsO1-xFx are nonmagnetic, and the rate of Tc-suppression absolute value of dTc/dx by Co atoms has been found to be too small to be explained by the pair-breaking effect expected for the S+- superconducting symmetry proposed as the most probable symmetry for the system. This result throws a serious doubt on whether the symmetry is realized in the system. Instead of the pair breaking, two mechanisms of Tc suppression by the doped impurities have been found: One is the electron localization, which appears when the sheet resistance r/sheet exceeds h/4e2=6.45 k-ohme, and the other is the disappearance (or reduction in the area) of the hole Fermi surfaces around the Gamma point in the reciprocal space. The latter mechanism has been observed when the number of electrons increases with increasing Co doping level and the system changes from an anomalous metal to an ordinary one. Regarding the two distinct T dependences of the NMR longitudinal relaxation rate 1/T₁ of LaFeAsO_1-xF_x, we discuss the origin of such a difference, and show that, at least, the T^2.5-3.0-like dependence of 1/T₁ cannot be considered as the experimental evidence for the S+- symmetry of Delta.

DOI： 10.1143/JPSJ.79.014719/

Studies of Multiferroic System LiCu2O2: I. Sample Characterization and Relationship between Magnetic Properties and Multiferroic Nature 査読有り

Yukio Yasui, Kenji Sato, Yoshiaki Kobayashi, and Masatoshi Sato

J. Phys. Soc. Jpn. 78 巻 ( 8 ) 頁： 084720-(1-5) 2009年8月

*Studies of Multiferroic System of LiCu2O2: II. Magnetic Structures of Two Ordered Phases with Incommensurate Modulations 査読有り

Yoshiaki Kobayashi, Kenji Sato, Yukio Yasui, Taketo Moyoshi, Masatoshi Sato, and Kazuhisa Kakurai

Journal of the Physical Society of Japan 78 巻 ( 8 ) 頁： 084721-(1-5) 2009年8月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Neutron diffraction and 7Li-NMR have been applied to determine the three dimensional magnetic structures of the multiferroic system LiCu2O2, which has four chains (ribbon chains) of edge-sharing CuO4 square planes in a unit cell. First, we have confirmed that there are successive magnetic transitions at TN1 = 24.5 K and TN2 = 22.8 K. In the T region between TN1 and TN2, the quasi one-dimensional spins (S = 1/2) of Cu2+ ions within a chain have a collinear and sinusoidally modulated structure with Cu-moments parallel to the c-axis and with the modulation vector along the b-axis. At T < TN2, an ellipsoidal helical spin structure with the incommensurate modulation has been found. We present detailed parameters, describing the modulation amplitudes, helical axis vectors as well as the relative phases of the modulations of four ribbon chains, which can well reproduce both the NMR and neutron results, in the two magnetically ordered phases. This finding of the rather precise magnetic structures enables us to discuss the relationship between the magnetic structure and the multiferroic nature of the present system in zero magnetic field, as presented in our companion paper (paper I), and open a way how to understand the reported electric polarization under the finite magnetic field.

Studies of Multiferroic System LiCu2O2: I. Sample Characterization and Relationship between Magnetic Properties and Multiferroic Nature

Yasui Yukio, Sato Kenji, Kobayashi Yoshiaki, Sato Masatoshi

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 78 巻 ( 8 ) 2009年8月

Studies of Multiferroic System of LiCu2O2: II. Magnetic Structures of Two Ordered Phases with Incommensurate Modulations

Kobayashi Yoshiaki, Sato Kenji, Yasui Yukio, Moyoshi Taketo, Sato Masatoshi, Kakurai Kazuhisa

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 78 巻 ( 8 ) 2009年8月

*Studies on Superconducting LaFe1-yCoyAsO1-xFx (x=0.11) - for the Understanding of the Superconducting Symmetry of Fe-Pnictides - 査読有り

Yoshiaki Kobayashi, Ayaka Kawabata, Sang Chul Lee, Taketo Moyoshi, and Masatoshi Sato

Journal of the Physical Society of Japan 78 巻 ( 7 ) 頁： 073704-(1-4) 2009年7月

Studies on Superconducting LaFe1-yCoyAsO1-xFx (x=0.11) -For the Understanding of the Superconducting Symmetry of Fe-Pnictides-

Kobayashi Yoshiaki, Kawabata Ayaka, Lee Sang Chul, Moyoshi Taketo, Sato Masatoshi

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 78 巻 ( 7 ) 2009年7月

Distinct Transport Behaviors of LaFe1-yCoyAsO1-xFx (x=0.11) between the Superconducting and Nonsuperconducting Metallic y Regions Divided by y~0.05 査読有り

Sang Chul Lee, Ayaka Kawabata, Taketo Moyoshi, Yoshiaki Kobayashi, and Masatoshi Sato

Journal of the Physical Society of Japan 78 巻 ( 4 ) 頁： 043703-(1-4) 2009年4月

Distinct Transport Behaviors of LaFe1-yCoyAsO1-xFx (x=0.11) between the Superconducting and Nonsuperconducting Metallic y Regions Divided by y similar to 0.05

Lee Sang Chul, Kawabata Ayaka, Moyoshi Taketo, Kobayashi Yoshiaki, Sato Masatoshi

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 78 巻 ( 4 ) 2009年4月

Studies of the superconductivity of LaFe1-yCoyAsO1-xFx (x=0.11) -impurity effect and NMR Knight shift-

Kawabata Ayaka, Lee Sang Chul, Moyoshi Taketo, Kobayashi Yoshiaki, Sato Masatoshi

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 77 巻頁： 147 - 148 2008年11月

Studies of the Superconductivity of LaFe1-yCoyAsO1-xFx 査読有り

Ayaka Kawabata, Sang Chul Lee, Taketo Moyoshi, Yoshiaki Kobayashi, and Masatoshi Sato

Journal of the Physical Society of Japan 77 巻 ( 10 ) 頁： 103704-(1-4) 2008年10月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

We have prepared the superconducting system LaFe1-yCoyAsO1-xFx (x=0.11) and carried out measurements of their electrical resistivity ρ and superconducting diamagnetism. 75As- and 135La-NMR studies have also been carried out. The Knight shift observed for 75As has been found to be suppressed by the superconductivity; for 135La, the shift is almost insensitive to the superconductivity. This result presents rather strong experimental evidence for singlet pairing. The Co doping effect on the superconducting transition temperature Tc is not so significant as expected for superconductors with nodes, suggesting that the potential scattering does not seem to primarily suppress the superconductivity. Even for superconductors without nodes, it may not be so trivial to expect this small effect, if there are two different (disconnected) Fermi surfaces whose order parameters have opposite signs. As a possible explanation of the observed Tc suppression, which is found to be small, seems to be related with the loss of the itinerant nature of the electrons.

Superconductivity of LaFe1-yCoyAsO1-xFx

Kawabata Ayaka, Lee Sang Chul, Moyoshi Taketo, Kobayashi Yoshiaki, Sato Masatoshi

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 77 巻 ( 10 ) 2008年10月

Isotope Effect on Superconducting Transition Temperature of NaxCoO2·yH2O 査読有り

Mai Yokoi, Yoshiaki Kobayashi, Masatoshi Sato, and Shunji Sugai

Journal of the Physical Society of Japan 77 巻 ( 9 ) 頁： 094713-(1-4) 2008年9月

Studies of the Superconductivity of LaFe1-yCoyAsO1-xFx (x=0.11) -Impurity Effect and NMR Knight Shift- 査読有り

Ayaka Kawabata, Sang Chul Lee, Taketo Moyoshi, Yoshiaki Kobayashi, and Masatoshi Sato

Journal of the Physical Society of JapanSupplement C 77 巻頁： 147-148 2008年9月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

LaFe1-yCoyAsO1-xFx (x=0.11) with various y values were prepared and their electrical resistivities, superconducting diamagnetisms and Hall coefficients have been measured. 75As- and 135La-NMR studies have also been carried out In spite of the successful Co-doping, we have not found any meaningful correlation of Tc with y, which indicates that the Tc-suppression by Co-doping is considered not to be so significant as expected for superconductors with nodes. Even for superconductors without nodes, it may not be easy to expect this small effect on Tc, if there are two different (disconnected) Fermi surfaces whose order parameters have opposite signs. The data of the NMR Knight shift indicate that the Cooper pairs are in the singlet state and the spin susceptibility is almost fully suppressed at low temperature.

Isotope effect on superconducting transition temperature of NaxCoO2 center dot yH(2)O

Yokoi Mai, Kobayashi Yoshiaki, Sato Masatoshi, Sugai Shunji

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 77 巻 ( 9 ) 2008年9月

Magnetic Excitations of NaxCoO2·yD2O -Neutron Scattering- 査読有り

Taketo Moyoshi, Yukio Yasui, Yoshiaki Kobayashi, Masatoshi Sato, and Kazuhisa Kakurai

Journal of the Physical Society of Japan 77 巻 ( 7 ) 頁： 073709-(1-4) 2008年7月

NMR Studies of Successive Phase Transitions in Na0.5CoO2 and K0.5CoO2 査読有り

Mai Yokoi, Yoshiaki Kobayashi, Taketo Moyoshi, and Masatoshi Sato

Journal of the Physical Society of Japan 77 巻 ( 7 ) 頁： 074704-(1-4) 2008年7月

Magnetic excitations of NaxCoO2 center dot yD(2)O - Neutron scattering

Moyoshi Taketo, Yasui Yukio, Kobayashi Yoshiaki, Sato Masatoshi, Kakurai Kazuhisa

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 77 巻 ( 7 ) 2008年7月

NMR studies of successive phase transitions in Na0.5CoO2 and K0.5CoO2

Yokoi Mai, Kobayashi Yoshiaki, Moyoshi Taketo, Sato Masatoshi

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 77 巻 ( 7 ) 2008年7月

Co-NMR Knight Shift of NaxCoO2·yH2O Studied in Both Superconducting Regions of the Tc-νQ3 Phase Diagram Divided by the Nonsuperconducting Phase 査読有り

Yoshiaki Kobayashi, Taketo Moyoshi, Mai Yokoi, and Masatoshi Sato

Journal of the Physical Society of Japan 77 巻 ( 6 ) 頁： 063703-(1-4) 2008年6月

Co-NMR knight shift of NaxCoO2 center dot yH(2)O studied in both superconducting regions of the T-c-nu(Q3) phase diagram divided by the nonsuperconducting phase

Kobayashi Yoshiaki, Moyoshi Taketo, Yokoi Mai, Sato Masatoshi

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 77 巻 ( 6 ) 2008年6月

On the Magnetic Structure of Quasi One Dimensional Spin 1/2 System of Li2ZrCuO4 査読有り

Yasuko Tarui, Yoshiaki Kobayashi, and Masatoshi Sato

Journal of the Physical Society of Japan 77 巻 ( 4 ) 頁： 043703-(1-4) 2008年4月

On the magnetic structure of quasi one dimensional spin 1/2 system of Li2ZrCuO4

Tarui Yasuko, Kobayashi Yoshiaki, Sato Masatoshi

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 77 巻 ( 4 ) 2008年4月

T-3nQ Phase Diagram of Hydrated Cobait Oxides NaxCoO2.yH2O 査読有り

Yoshiaki Kobayashi, Mai Yokoi, Taketo Moyosi and Masatoshi Sato

Journal of the Physical Society of Japan 76 巻 ( 10 ) 頁： 103705-(1-5) 2007年10月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

The superconducting transition temperatures Tc of NaxCoO2.yH2O prepared by various methods have been found to exhibit the systematic dependence on the nuclear quadrupole frequency nQ. In the Tc-3nQ Phase Diagram, the superconducting region is divied into two regions by the nonsuperconducting phase. We have investigated the origin of the nonsuperconducting phase by NMR measurements, the results indicate that the nonsuperconducting phase is possibly in the charge disproportionate state.

T-3v(Q) phase diagram of hydrated cobalt oxides Na(x)CoO(2 center dot)yH(2)O

Kobayashi Yoshiaki, Yokoi Mai, Moyoshi Taketo, Sato Masatoshi

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 76 巻 ( 10 ) 2007年10月

Magnetic Behavior of Spin-1/2 Frustrated System Hg2Cu2F6S 査読有り

Shohei Kawabata, Yukio Yasui, Yoshiaki Kobayashi and Masatoshi Sato

Journal of the Physical Society of Japan 76 巻 ( 8 ) 頁： 084705-(1-5) 2007年8月

Magnetic Behavior of spin-1/2 frustrated system Hg2Cu2F6S

Kawabata Shohei, Yasui Yukio, Kobayashi Yoshiaki, Sato Masatoshi

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 76 巻 ( 8 ) 2007年8月

Spin-gap behavior of distorted honeycomb lattice system Na3Cu2SbO6

Miura Yoko, Hirai Riu, Fujita Toshiaki, Kobayashi Yoshiaki, Sato Masatoshi

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 310 巻 ( 2 ) 頁： E389 - E391 2007年3月

NMR studies of successive transition in Na0.5CoO2

Kobayashi Y., Yokoi M., Moyoshi T., Watanabe H., Sato M.

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 310 巻 ( 2 ) 頁： 675 - 677 2007年3月

NMR and neutron scattering studies on NaxCoO2 center dot yH(2)O

Sato M., Kobayashi Y., Moyoshi T., Yokoi M., Watanabe H., Mori Y., Kakurai K.

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 310 巻 ( 2 ) 頁： 666 - 668 2007年3月

Magnetic and thermal properties of Co3V2O8 and Ni3V2O8

Kobayashi Yusuke, Yasui Yukio, Sato Masatoshi

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 310 巻 ( 2 ) 頁： 1160 - 1161 2007年3月

Studies of successive transitions in K0.5CoO2

Yokoi Mai, Mori Yoshihiko, Moyoshi Taketo, Kobayashi Yoshiaki, Sato Masatoshi

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 310 巻 ( 2 ) 頁： 672 - 674 2007年3月

Ferroelectric transition induced by the incommensurate magnetic ordering in LiCuVO4

Naito Yutaka, Sato Kenji, Yasui Yukio, Kobayashi Yusuke, Kobayashi Yoshiaki, Sato Masatoshi

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 76 巻 ( 2 ) 2007年2月

Structural studies of pyrochlore-related spin-1/2 system Ag2Cu2O3

Uematsu Daisuke, Soda Minoru, Kobayashi Yoshiaki, Sato Masatoshi, Igawa Naoki, Kakurai Kazuhisa

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 75 巻 ( 12 ) 2006年12月

Existence of Co3+ low-spin state in TbBaCo2O5.5

Soda Minoru, Yasui Yukio, Kobayashi Yoshiaki, Fujita Toshiaki, sato Mashi Sato, Kakurai Kazuhisa

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 75 巻 ( 10 ) 2006年10月

Spin-Gap Behavior of Na3Cu2SbO6 with Distorted Honeycomb Structure 査読有り

Yoko Miura, Riu Hirai, Yoshiaki Kobayashi and Masatoshi Sato

Journal of the Physical Society of Japan 75 巻 ( 8 ) 頁： 084707-(1-6) 2006年8月

Spin-gap behavior of Na3Cu2SbO6 with distorted honeycomb structure

Miura Yoko, Hirai Riu, Kobayashi Yoshiaki, Sato Masatoshi

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 75 巻 ( 8 ) 2006年8月

Magnetic properties of Superconducitng Cobait Oxides NaxCoO2.yH2O 査読有り

Yoshiaki Kobayshi, taketo Moyoshi, Hidekazu Watanabe Mai Yokoi and Masatoshi Sato

Journal of the Physical Society of Japan 75 巻 ( 7 ) 頁： 074717-(1-6) 2006年7月

Search for Magnetic Excitation Spectra of NaxCoO2.yD2O -Neutron Scattering- 査読有り

Taketo Moyoshi, Yukio Yasui, Minoru Soda, Yoshiaki Kobayashi, Masatoshi Sato and Kazuhisa Kakurai

Journal of the Physical Society of Japan 75 巻 ( 7 ) 頁： 074705-(1-6) 2006年7月

Magnetic properties of superconducting cobalt oxides NaxCoO2 center dot yH(2)O

Kobayashi Yoshiaki, Moyoshi Taketo, Watanabe Hidekazu, Yokoi Mai, sato Mashi Sato

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 75 巻 ( 7 ) 2006年7月

Search for magnetic excitation spectra of NaxCoO2 center dot yD(2)O - Neutron scattering

Moyoshi Taketo, Yasui Yukio, Soda Minoru, Kobayashi Yoshiaki, Sato Masatoshi, Kakurai Kazuhisa

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 75 巻 ( 7 ) 2006年7月

Magnetic and metal-insulator transitions in beta-Na0.5CoO2 and gamma-K0.5CoO2 - NMR and neutron diffraction studies

Watanabe H, Mori Y, Yokoi M, Moyoshi T, Soda M, Yasui Y, Kobayashi Y, Sato M, Igawa N, Kakurai K

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 75 巻 ( 3 ) 2006年3月

*Magnetic correlation of NaxCoO2 and Successive Phase Transitions of Na0.5CoO2 -NMR and Neutron Diffraction Studies- 査読有り

Mai Yokoi, Taketo Moyoshi, Yoshiaki Kobayashi, Munoru Soda, Yukio Yasui, Masatoshi Sato and Kazushi Kakurai

Journal of the Physical Society of Japan 74 巻 ( 11 ) 頁： 3046-3056 2005年11月

Co-59-NMR Knight shift of superconducting three-layer NaxCoO2 center dot yH(2)O

Watanabe H, Kobayashi Y, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 74 巻 ( 9 ) 頁： 2563 - 2567 2005年9月

59Co-NMR Knight shift of Aligned Crystal and Polycrystalline Samples of Superconducting Na0.3CoO2.1.3H2O 査読有り

Yoshiaki Kobayashi, Hidekazu Watanabe, Mai Yokoi, Taketo Moyoshi, Yoshihiko Mori and Masatoshi Sato

Journal of the Physical Society of Japan 74 巻 ( 6 ) 頁： 1800-1805 2005年6月

Co-59-NMR knight shift of aligned crystals and polycrystalline samples of superconducting Na0.3CoO2 center dot 1.3H(2)O

Kobayashi Y, Watanabe H, Yokoi M, Moyoshi T, Mori Y, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 74 巻 ( 6 ) 頁： 1800 - 1805 2005年6月

ESR studies on quasi one-dimensional spin system TiOBr

Kato C, Kobayashi Y, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 74 巻 ( 1 ) 頁： 473 - 477 2005年1月

Magnetic structure of a spinel system Cu0.3Zn0.7Cr2Se4

Iikubo S, Yasui Y, Kobayashi Y, Ohno Y, Ito M, Soda M, Sato M, Kakurai K

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 272 巻頁： 473 - 474 2004年5月

Impurity effects on the superconducting transition temperature of NazCoO2 center dot yH(2)O

Yokoi M, Watanabe H, Mori Y, Moyoshi T, Kobayashi Y, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 73 巻 ( 5 ) 頁： 1297 - 1302 2004年5月

Ru-NMR studies and specific heat measurements of Bi3Ru3O11 and La4Ru6O19

Tsuchida K, Kato C, Fujita T, Kobayashi Y, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 73 巻 ( 3 ) 頁： 698 - 702 2004年3月

Co-59-NMR knight shift of superconducting NaxCoO2 center dot yH(2)O

Kobayashi Y, Yokoi M, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 72 巻 ( 10 ) 頁： 2453 - 2455 2003年10月

Co-59 NQR study on superconducting NaxCoO2 center dot yH(2)O

Kobayashi Y, Yokoi M, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 72 巻 ( 9 ) 頁： 2161 - 2164 2003年9月

NMR studies of Co-oxides with large thermoelectric performance

Kobayashi Y, Masuda H, Miyashita T, Sato M, Itoh M, Terasaki I

PHYSICA B-CONDENSED MATTER 329 巻頁： 926 - 927 2003年5月

Spin-state change of co atoms of La4Co3O10+delta

Miyashita T, Kobayashi Y, Fukamachi T, Masuda H, Sato M

PHYSICA B-CONDENSED MATTER 329 巻頁： 740 - 742 2003年5月

Spin-glass-like transition and Hall resistivity of Y2-xBixIr2O7

Aito N, Soda M, Kobayashi Y, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 72 巻 ( 5 ) 頁： 1226 - 1230 2003年5月

Transport, thermal and magnetic properties of Bi3Os3O11 and Bi3Ru3O11

Fujita T, Tsuchida K, Yasui Y, Kobayashi Y, Sato M

PHYSICA B-CONDENSED MATTER 329 巻頁： 743 - 744 2003年5月

Transport, thermal and magnetic properties of pyrochlore oxides Y2-xBixIr2O7

Soda M, Aito N, Kurahashi Y, Kobayashi Y, Sato M

PHYSICA B-CONDENSED MATTER 329 巻頁： 1071 - 1073 2003年5月

Transport and magnetic properties of R(1-x)A(x)CoO(3) (R = La, Pr and Nd; A = Ba, Sr and Ca)

Masuda H, Fujita T, Miyashita T, Soda M, Yasui Y, Kobayashi Y, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 72 巻 ( 4 ) 頁： 873 - 878 2003年4月

*59Co-NMR Knight Shift of Superconducting NaxCoO2·yH2O 査読有り

Yoshiaki Kobayashi, Mai Yokoi and Masatoshi Sato

Journal of the Physical Society of Japan 72 巻頁： 2453-2455 2003年

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Layered Co oxide NaxCoO2·yH2O with the superconducting transition temperature Tc=4.5 K has been studied by 59Co-NMR. The Knight shift K estimated from the observed spectra of a powder sample exhibits almost temperature (T)-independent behavior above Tc and decreases with decreasing T below Tc. This result and the existence of the coherence peak in the spin–lattice relaxation rate versus T curve reported by the present authors indicate, naively speaking, that the singlet order parameter with s-wave symmetry is realized in NaxCoO2·yH2O. Differences in the observed behaviors between the spectra of a nonaligned sample and those of an aligned sample embedded in epoxy adhesive by applying an external magnetic field are discussed.

Co-59-NMR studies on La4Co3O10+delta

Miyashita T, Kobayashi Y, Fukamachi T, Masuda H, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 71 巻 ( 12 ) 頁： 3043 - 3046 2002年12月

Magnetic structure and the Hall resistivity of Cu1-xZnxCr2Se4

Iikubo S, Yasui Y, Oda K, Ohno Y, Kobayashi Y, Sato M, Kakurai K

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 71 巻 ( 11 ) 頁： 2792 - 2799 2002年11月

Transport and NQR studies of Nd1.6-xCexSr0.4CuO4 with T* structure

Ambai M, Kobayashi Y, Iikubo S, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 71 巻 ( 2 ) 頁： 538 - 542 2002年2月

Unusual anomalous Hall resistivities of CuCr2S4, Cu0.5Zn0.5Cr2Se4 and Cr3Te4

Oda K, Yoshii S, Yasui Y, Ito M, Ido T, Ohno Y, Kobayashi Y, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 70 巻 ( 10 ) 頁： 2999 - 3005 2001年10月

Studies on successive electronic state changes in systems with NiO2 planes-La-139-NMR/NQR-

Fukamachi T, Oda K, Kobayashi Y, Miyashita T, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 70 巻 ( 9 ) 頁： 2757 - 2764 2001年9月

Cu NQR study on the "wipeout" phenomenon in YBa2Cu3Oy

Kobayashi Y, Miyashita T, Ambai M, Fukamachi T, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 70 巻 ( 4 ) 頁： 1133 - 1136 2001年4月

La-139 NMR studies of layered perovskite systems La3Ni2O7-delta and La4Ni3O10

Fukamachi T, Kobayashi Y, Miyashita T, Sato M

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS 62 巻 ( 1-2 ) 頁： 195 - 198 2001年

NMR studies of Ga in magnetically frustrated pyrochlore system R2GaSbO7 (R = rare earth elements)

Kobayashi Y, Miyashita T, Fukamachi T, Sato M

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS 62 巻 ( 1-2 ) 頁： 347 - 350 2001年

Absence of the "wipeout" phenomenon in the NQR spectra of YBa2Cu3O6.61

Kobayashi Y, Miyashita T, Ambai M, Fukamachi T, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 69 巻 ( 8 ) 頁： 2435 - 2438 2000年8月

On the anomalous oxygen-number dependence of the superconducting transition temperature of R1-xPrxBa2Cu3O6+y (R=Y and Sm)

Ambai M, Yasui Y, Takeda J, Kobayashi Y, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 69 巻 ( 1 ) 頁： 170 - 177 2000年1月

Magnetization measurements and Rb-87-NMR on Rb2M3S4 (M=Ni and Pd) with the Kagome lattice

Fukamachi T, Kobayashi Y, Nakamura A, Harashina H, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 68 巻 ( 11 ) 頁： 3668 - 3672 1999年11月

Effects of short range spin correlation on ESR lines of low-dimensional antiferromagnetic and spin-gapped systems

Taniguchi S, Kato M, Kodama K, Kobayashi Y, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 68 巻 ( 6 ) 頁： 2118 - 2127 1999年6月

Thermal conductivity of BaCo1-xNixS2

Takeda J, Sakurai J, Nakamura A, Kato M, Kobayashi Y, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 68 巻 ( 5 ) 頁： 1602 - 1606 1999年5月

On the magnetic properties of systems with low dimensional linkage of VO5 pyramids

Kanada M, Harashina H, Tanaka S, Fukamachi T, Kobayashi Y, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 67 巻 ( 8 ) 頁： 2904 - 2909 1998年8月

NMR studies on spin-gap behavior of monoclinic CuNb2O6

Fukamachi T, Kobayashi Y, Kanada M, Kasai M, Yasui Y, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 67 巻 ( 6 ) 頁： 2107 - 2111 1998年6月

Spin-gap behavior of CuNb2O6

Kodama K, Fukamachi T, Harashina H, Kanada M, Kobayashi Y, Kasai M, Sasaki H, Sato M, Kakurai K

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 67 巻 ( 1 ) 頁： 57 - 60 1998年1月

V-51-NMR study of the misfit layer compounds La1.17-xSrxVS3.17

Kobayashi Y, Kasai M, Yasui Y, Nishikawa T, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 66 巻 ( 12 ) 頁： 4027 - 4030 1997年12月

ESR studies on CaV4O9 and CaV3O7

Taniguchi S, Kobayashi Y, Kasai M, Kodama K, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 66 巻 ( 11 ) 頁： 3660 - 3664 1997年11月

Electron- and photon-thermal conductivity of high-T-c systems from the underdoped insulating to the nonsuperconducting metallic phase

Kamijo H, Takeda J, Hayashi F, Ueda E, Fujiwara K, Kobayashi Y, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 66 巻 ( 8 ) 頁： 2466 - 2472 1997年8月

Structural studies on the phase transition of La3Ni2O6.92 at about 550 K

Sasaki H, Harashina H, Taniguchi S, Kasai M, Kobayashi Y, Sato M, Kobayashi T, Ikeda T, Takata M, Sakata M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 66 巻 ( 6 ) 頁： 1693 - 1697 1997年6月

Study of spin-gap formation in quasi-two-dimensional S=1/2 system CaV4O9: Neutron scattering and NMR

Kodama K, Harashina H, Sasaki H, Kobayashi Y, Kasai M, Taniguchi S, Yasui Y, Sato M, Kakurai K, Mori T, Nishi M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 66 巻 ( 3 ) 頁： 793 - 802 1997年3月

Transport and magnetic properties of La3Ni2O7-delta and La4Ni3O10-delta

Kobayashi Y, Taniguchi S, Kasai M, Sato M, Nishioka T, Kontani M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 65 巻 ( 12 ) 頁： 3978 - 3982 1996年12月

Strong pressure effect on the electrical resistivity of BaCo1-xNixS2

Yasui Y, Kobayashi Y, Takeda J, Shamoto S, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 65 巻 ( 9 ) 頁： 2757 - 2760 1996年9月

Thermal properties of two dimensional Mott system La-1.17-xSrxVS3.17

Nishikawa T, Yasui Y, Kobayashi Y, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 65 巻 ( 8 ) 頁： 2543 - 2547 1996年8月

Electron and magnon contributions to the thermal conductivity of YBa2Cu3Oy (6.1<=y<=6.9) at low temperatures

Kamijo H, Kobayashi Y, Ueda E, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 65 巻 ( 6 ) 頁： 1551 - 1554 1996年6月

Studies of the metal-insulator transition of misfit-layer compounds La1.17-xSrVS3.17

Nishikawa T, Yasui Y, Kobayashi Y, Sato M

PHYSICA C 263 巻 ( 1-4 ) 頁： 554 - 557 1996年5月

EFFECTS OF CARRIER DOPING INTO THE MISFIT-LAYER COMPOUNDS (LA(1-Y)R(Y)S)(1+ALPHA)VS2 (R=SR AND PB) - TRANSPORT AND MAGNETIC STUDIES

YASUI Y, NISHIKAWA T, KOBAYASHI Y, SATO M, NISHIOKA T, KONTANI M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 64 巻 ( 10 ) 頁： 3890 - 3896 1995年10月

SPIN GAP BEHAVIOR OF S=1/2 QUASI-2-DIMENSIONAL SYSTEM CAV4O9

TANIGUCHI S, NISHIKAWA T, YASUI Y, KOBAYASHI Y, SATO M, NISHIOKA T, KONTANI M, SANO K

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 64 巻 ( 8 ) 頁： 2758 - 2761 1995年8月

TRANSPORT, MAGNETIC AND THERMAL-PROPERTIES OF BACO1-XNIXS2

TAKEDA J, KOBAYASHI Y, KODAMA K, HARASHINA H, SATO M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 64 巻 ( 7 ) 頁： 2550 - 2557 1995年7月

TRANSPORT, MAGNETIC AND THERMAL-PROPERTIES OF LA3NI2O7-DELTA

TANIGUCHI S, NISHIKAWA T, YASUI Y, KOBAYASHI Y, TAKEDA J, SHAMOTO S, SATO M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 64 巻 ( 5 ) 頁： 1644 - 1650 1995年5月

1H-NMR investigation of the SDW wave-number in (TMTTF)2Br 査読有り

T. Nakamura, T. Nobutoki, Y. Kobayashi, T. Takahashi, G. Saito

Synthetic Metals(Elsevier) 70 巻 ( 1-3 ) 頁： 1293 - 1294 1995年3月

Observation of the coherence peak of 1H-NMR relaxation rate in the superconducting state of (MDT-TTF)2Aul2 査読有り

Y. Kobayashi, T. Nakamura, T. Takahashi, K. Kanoda, B. Hilti, J. S. Zambounis

Synthetic Metals(Elsevier) 70 巻 ( 1-3 ) 頁： 871 - 872 1995年3月

Magnetic properties of the insulating state of the organic superconductor, β-[(CH3)4N][Pd(dmit)2]2 査読有り

Synthetic Metals (Elsevier) 70 巻 ( 1-3 ) 頁： 1043 - 1044 1995年3月

Symmetry of the order parameter in organic superconductors:(MDT-TTF) 2Aul2 vs.(TMTSF) 2ClO4 招待有り査読有り

T Takahashi, Y Kobayashi, T Nakamura, K Kamoda, B Hilti, JS Zambounis

Physica C: Superconductivity (North-Holland) 7 巻 ( 3 ) 頁： 636 - 666 1994年12月

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