Kenichi Kojima

Profile Information

Degree: 理学博士(東北大学)

J-GLOBAL ID: 200901064535339739
researchmap Member ID: 1000037353

Research Interests

Research Areas

Natural sciences / Magnetism, superconductivity, and strongly correlated systems /

Papers

Conduction-band electronic states of YbInCu4 studied by photoemission and soft x-ray absorption spectroscopies

UTSUMI YUKI, SATO HITOSHI, KURIHARA HIDENAO, MASO HIROYUKI, HIRAOKA KOICHI, KOJIMA KENICHI, TOBIMATSU KOMEI, OHKOCHI TAKUO, FUJIMORI SHIN-ICHI, TAKEDA YUKIHARU …

Physical Review B, 84(11) 115143.1-115143.7, Sep, 2011 Peer-reviewed
Synchrotron Radiation Diffraction Study of YbInCu4

Utsumi, Yuki, Sato, Hitoshi, Moriyoshi, Chikako, Kuroiwa, Yoshihiro, Namatame, Hirofumi, Taniguchi, Masaki, Hiraoka, Koichi, Kojima, Kenichi, Sugimoto, Kunihisa

JAPANESE JOURNAL OF APPLIED PHYSICS, 50(5), May, 2011 Peer-reviewed
Valence Transition of YbInCu₄ Observed by Photoemission Spectroscopy

Hitoshi Sato, Masaki Taniguchi, Koichi Hiraoka, Kenichi Kojima

e-J. Surf. Sci. Nanotech., 9 90-94, 2011
X-dependent electronic structure of YbXCu4 (X=Cd, In, Sn) investigated by hard X-ray photoemission spectroscopy

Y. Utsumi, H. Sato, K. Tobimatsu, H. Maso, K. Hiraoka, K. Kojima, K. Mimura, S. Ueda, Y. Yamashita, H. Yoshikawa …

Journal of Electron Spectroscopy and Related Phenomena, 184(3月6日) 203-206, 2011 Peer-reviewed
Structural and thermal gas desorption properties of metal aluminum amides

Taisuke Ono, Keiji Shimoda, Masami Tsubota, Satoshi Hino, Ken-Ichi Kojima, Takayuki Ichikawa, Yoshitsugu Kojima

Journal of Alloys and Compounds, 506(1) 297-301, Sep 10, 2010 Peer-reviewed
Low-energy excited photoemission spectroscopy of YxYb1-xInCu4

K. Yoshikawa, H. Sato, M. Arita, M. Higashi, K. Hiraoka, K. Kojima, H. Namatame, M. Taniguchi

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA, 156 361-364, May, 2007 Peer-reviewed
Neutron powder diffraction study of the site disorder in YbInCu4

K. Hiraoka, H. Yabuta, K. Kojima, K. Oikawa, T. Kamiyama

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 310(2) 380-382, Mar, 2007
Sb NQR studies of ferromagnetism in YbxFe4Sb 12 with x ≈ 0:89

Munemichi Kawaguchi, Hideki Tou, Masafumi Sera, Kenichi Kojima, Tsuyoshi Ikeno, Yosikazu Isikawa

Journal of the Physical Society of Japan, 75(9), Sep, 2006 Peer-reviewed
Yb 4f states of YbXCu₄ (X=Cd, Mg, Zn and Sn) investigated by high-resolution soft X-ray photoemission spectroscopy

YOSHIKAWA K, SATO H, ARITA M, FUJIMOTO K, HIRAOKA K, KOJIMA K, TANIGUCHI M, TANIGUCHI M

ElsevierJournal of Alloys and Compounds, 408-412 92-94, 2006
Rapid suppression of the commensurate magnetic ordered phase of prb 6 by la doping

Masafumi Sera, Shinya Goto, Tatsurou Koshikawa, Moo-Sung Kim, Hideki Tou, Fumitoshi Iga, Yutaka Mitsukawa, Kenichi Kojima

Journal of the Physical Society of Japan, 74(10) 2691-2694, Oct, 2005 Peer-reviewed
Low-energy excited photoemission study of the valence transition of YbInCu4

K Yoshikawa, H Sato, M Arita, Y Takeda, K Hiraoka, K Kojima, K Tsuji, H Namatame, M Taniguchi

PHYSICAL REVIEW B, 72(16), Oct, 2005 Peer-reviewed
Electronic structure of YbXCu4 (X = Cd, Mg, Zn) investigated by means of low-energy excited high-resolution photoemission spectroscopy

K Yoshikawa, H Sato, M Arita, K Tsuji, Y Takeda, H Namatame, M Taniguchi, K Hiraoka, K Kojima

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA, 144 605-607, Jun, 2005
Valence transition of YbInCu4 observed in hard x-ray photoemission spectra

Sato, H, Shimada, K, Arita, M, Hiraoka, K, Kojima, K, Takeda, Y, Yoshikawa, K, Sawada, M, Nakatake, M, Namatame, H

PHYSICAL REVIEW LETTERS, 93(24), Dec 10, 2004 Peer-reviewed
Hard X-ray photoemission spectroscopy of YbInCu4

Sato, H, Shimada, K, Arita, M, Takeda, Y, Sawada, M, Nakatake, M, Yoshikawa, K, Namatame, H, Takata, Y, Kobayashi, K …

Physica B-Condensed Matter, 351(3月4日) 298-300, Sep 15, 2004 Peer-reviewed
In-115 NMR study of YbInNi4

H Yabuta, K Hiraoka, Y Miura, K Kojima, S Tomiyoshi

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 272 205-206, May, 2004
Soft-x-ray high-resolution photoemission study on the valence transitions in YbInCu4

Hitoshi Sato, Kunta Yoshikawa, Koichi Hiraoka, Masashi Arita, Koji Fujimoto, Kenichi Kojima, Takayuki Muro, Yuji Saitoh, Akira Sekiyama, Shigemasa Suga …

Physical Review B - Condensed Matter and Materials Physics, 69(16) 1-165101, Apr, 2004 Peer-reviewed
Soft-x-ray high-resolution photoemission study on the valence transitions in YbInCu4

H Sato, K Yoshikawa, K Hiraoka, M Arita, K Fujimoto, K Kojima, T Muro, Y Saitoh, A Sekiyama, S Suga …

PHYSICAL REVIEW B, 69(16) 165101-1-6, Apr, 2004 Peer-reviewed
emperature-dependent high-resolution photoemission spectroscopy of YbXCu4 (X=In, Cd, Mg)

Surface Review and Letters, 9(2) 1079-1083, Apr 1, 2002 Peer-reviewed
Analysis of 11B-NMR in the Antiferromagnetic Phase III of CeB6

Tsuji Shigenori, Sera Masafumi, Kojima Kenichi

J Phys Soc Jpn, 70(10) 2864-2867, Oct 15, 2001
Spin fluctuations and magnetic order in the heavy fermion compound CePt2Sn2

GM Luke, K Kojima, M Larkin, J Merrin, B Nachumi, YJ Uemura, GM Kalvius, A Bruckl, K Neumaier, K Andres …

HYPERFINE INTERACTIONS, 104(1-4) 199-203, 1997 Peer-reviewed

Misc.

178

23aPS-59 Cd substitution effect on the valence phase transition of YbIn_<1-x>Cd_xCu_4 II

Zhuang T, Hiraoka K, Kojima K, Onimaru T, Takabatake T

Meeting abstracts of the Physical Society of Japan, 66(2), Aug 24, 2011
23pPSA-17 Ultrasonic investigation of Quantum Criticalty in the polycrystal compound YbAuCu_4

Koseki G, Nakanishi Y, kashiwazaki R, shichinomiya F, Deto K, Koseki M, Nakamura M, Yoshizawa M, Kojima K, Utsunomiya K …

Meeting abstracts of the Physical Society of Japan, 65(2), Aug 18, 2010
23pPSA-20 Valence phase transition temperature and lattice constant in YbIn_<1-x>Cd_xCu_4

Zhuang T, Yuasa F, Hiraoka K, Kojima K, Onimaru T, Takabatake T

Meeting abstracts of the Physical Society of Japan, 65(2), Aug 18, 2010
27aPS-56 Accurate crystal structure analysis of YbInCu_4 by synchrotron radiation single crystal diffraction

Utsumi Y, Sato H, Hashimoto T, Moriyoshi C, Kuroiwa Y, Taniguchi M, Hiraoka K, Kojima K, Sugimoto K

Meeting abstracts of the Physical Society of Japan, 64(1), Mar 3, 2009
22aTQ-1 Cu-derived electronic structure of Y_xYb_<1-X>InCu_4

Kurihara H, Sato H, Maso H, Hiraoka K, Kojima K, Fujimori S, Ohkochi T, Saitoh Y, Namatame H, Taniguchi M

Meeting abstracts of the Physical Society of Japan, 62(2), Aug 21, 2007
Low-energy excited photoemission spectroscopy of YxYb1-xInCu4

K. Yoshikawa, H. Sato, M. Arita, M. Higashi, K. Hiraoka, K. Kojima, H. Namatame, M. Taniguchi

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA, 156 LXXXVIII-LXXXVIII, May, 2007
18pPSA-6 Thermal expansion and valence phase transition of Yb_<1-x>Y_xInCu_4

Sakao M, Miura Y, Hiraoka K, Tanaka T, Kojima K, Iga F, Takabatake T, Shigeoka T

Meeting abstracts of the Physical Society of Japan, 62(1), Feb 28, 2007
23pPSA-6 ^<31>P NMR study of RFe_4P_<12> (R=Ho, Tm) II

Kojima K, Hiraoka K, Tou H, Arazeki N, Sekine C, Shirotani I, Sera M

Meeting abstracts of the Physical Society of Japan, 61(2), Aug 18, 2006
25aZR-6 Valence phase transition and magnetic studies of Yb_<1-x>Y_xInCu_4 II

Sakao M, Miura Y, Hiraoka K, Kojima K, Iga F, Takabatake T, Shigeoka T

Meeting abstracts of the Physical Society of Japan, 61(2), Aug 18, 2006
29pPSA-6 Physical properties of valence phase transition materials YbInCu_4 II

Watanabe K, Hiraoka K, Tomiyoshi S, Kojima K

Meeting abstracts of the Physical Society of Japan, 61(1), Mar 4, 2006
20pPSA-2 Low-energy excited photoemission spectroscopy of Y_xYb_<1-x>InCu_4

Yoshikawa K, Sato H, Arita M, Higashi M, Hiraoka K, Kojima K, Namatame H, Taniguchi M

Meeting abstracts of the Physical Society of Japan, 60(2), Aug 19, 2005
Electronic states near the Fermi edge of YbInCu4

K Yoshikawa, H Sato, K Tsuji, M Arita, Y Takeda, H Namatame, M Taniguchi, K Hiraoka, K Kojima

PHYSICA B-CONDENSED MATTER, 351(3-4) 301-303, Sep, 2004
14pPSB-6 Physical properties of valence phase transition materials YblnCu_4

Watanabe K, Hiraoka K, Tomiyoshi S, Kojima K

Meeting abstracts of the Physical Society of Japan, 59(2), Aug 25, 2004
27aXQ-5 Hard x-ray photoemission spectroscopy of YbInCu_4

Sato H, Shimada K, Arita M, Takeda Y, Sawada M, Nakatake M, Yoshikawa K, Taniguchi M, Namatame H, Hiraoka K …

Meeting abstracts of the Physical Society of Japan, 59(1), Mar 3, 2004
Experimental Study of ^<63>Cu NQR in LuMCu_4

Yabuta H, Kojima K, Hiraoka K

Meeting abstracts of the Physical Society of Japan, 58(2), Aug 15, 2003
NMR study of YbInNi_4

Miura Y, Hiraoka K, Tomiyoshi S, Kojima K

Meeting abstracts of the Physical Society of Japan, 58(2), Aug 15, 2003
Crystal structure and valence transition temperature of YbInCu4 single crystals

C Moriyoshi, S Shimomura, K Itoh, K Kojima, K Hiraoka

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 260(1-2) 206-210, Mar, 2003
Crystal structure and valence transition temperature of YbInCu4 single crystals

C Moriyoshi, S Shimomura, K Itoh, K Kojima, K Hiraoka

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 260(1-2) 206-210, Mar, 2003
NMR and NQR studies of YbMCu4(M=Cd,In,Sn)

Muta J, Hiraoka K, Maeda K, Tomiyoshi S, Kojima K

Meeting abstracts of the Physical Society of Japan, 57(2), Aug 13, 2002
The effect of Cu disorder to the valence transition temperature of YbInCu4

Kojima K, Hiraoka K, Oikawa K, Kamiyama T

Meeting abstracts of the Physical Society of Japan, 57(2), Aug 13, 2002

Books and Other Publications

63Cu NQR Study of Uranium Ternary Compound UCu2Sn

Physics of Strongly Correlated Electron Systems JJAP Series, 1999
63Cu NQR Study of Uranium Ternary Compound UCu2Sn

Physics of Strongly Correlated Electron Systems JJAP Series, 1999
Magnetic Phases of EuSe1-xTx(T=S and Te) and Eu1-xSrxSe

Ferrites:Proceedings of the International Conference, September-October 1980, Japan, 1980
Magnetic Phases of EuSe1-xTx(T=S and Te) and Eu1-xSrxSe

Ferrites:Proceedings of the International Conference, September-October 1980, Japan, 1980
Theory and Experiment of SmB6

Valence Instabilities and Related Narrow-Band Phenomena ed. R. D. Parks(Plenum, New York 1978), 1978
Theory and Experiment of SmB6

Valence Instabilities and Related Narrow-Band Phenomena ed. R. D. Parks(Plenum, New York 1978), 1978

Research Projects

Study of Internal Field in the Magnetic Ordered Static of the rare-earth hexaboride by the Nuclear Magnetic Resonance

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Japan Society for the Promotion of Science, 2000 - 2001

SERA Masafumi, KOJIMA Kenichi, IGA Fumitoshi
Control of the Orbital Degrees of Freedem by the Magnetic Field and Pressure

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research on Priority Areas (B), Japan Society for the Promotion of Science, 1999 - 2001

SERA Masafumi, IGA Fumitoshi, SUZUKI Takashi
NMR Study of Uranium Ternary Compounds with a Weak Magnetic Interaction

Grants-in-Aid for Scientific Research, Grant-in-Aid for General Scientific Research (C), Japan Society for the Promotion of Science, 1992 - 1993

KOJIMA Kenichi, TAKABATAKE Toshiro
ウラン三元系UーTーX(T=Ni,Pd,Pt,X=In,Sn)の相図と物質探索

科学研究費助成事業, 重点領域研究, 日本学術振興会, 1990 - 1990

高畠敏郎, 浴野稔一, 小島健一
ウラニウム三元系UT_2X(T:VIII族、X:S-P元素)における物質開発

科学研究費助成事業, 重点領域研究, 日本学術振興会, 1989 - 1989

高畠敏郎, 小島健一
高温超伝導機構への電子・格子相互作用の効果

科学研究費助成事業, 重点領域研究, 日本学術振興会, 1989 - 1989

大林康二, 宇田川真行, 小島健一, 檜原忠幹
Physical Properties of Fe_2P-type CeTIn single crystals with T=Ni, Pd and Pt.

Grants-in-Aid for Scientific Research, Grant-in-Aid for General Scientific Research (C), Japan Society for the Promotion of Science, 1988 - 1989

FUJII Hironobu, KOJIMA Kenichi, HIHARA Tadamiki
高温超伝導機構への電子・格子相互作用の効果

科学研究費助成事業, 重点領域研究, 日本学術振興会, 1988 - 1988

大林康二, 宇田川眞行, 小島健一, 桧原忠幹
Tm Seの価数揺動状態と磁性

科学研究費助成事業, 一般研究(D), 日本学術振興会, 1979 - 1979

小島健一
強相関電子系の核磁気共鳴による研究
NMR Study for Strongly Correlated Electron Systems

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