研究者詳細 - 小山　佳一

論文 - 小山　佳一

分割表示 487 件中 161 - 180 件目／全件表示 >>

M. Yamamoto, S. Sekida, T. Fukuda, T. Kakeshita, K. Takahashi,K. Koyama, H. Nojiri . A new type of FCT martensite phase in single-crystalline Fe(3)Pt Invar alloy . JOURNAL OF ALLOYS AND COMPOUNDS509 ( 34 ) 8530 - 8533 2011年8月査読

Yamamoto M., Sekida S., Fukuda T., Kakeshita T., Takahashi K., Koyama K., Nojiri H. . A new type of FCT martensite phase in single-crystalline Fe<inf>3</inf>Pt Invar alloy . Journal of Alloys and Compounds509 ( 34 ) 8530 - 8533 2011年8月査読

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Alloys and Compounds

Martensitic transformation in a highly ordered Fe3Pt has been investigated by magnetization and X-ray diffraction measurements. We confirmed that a new type of face-centered tetragonal (FCT) martensite phase appears below 60 K in Fe3Pt with a degree of order S = 0.88. The tetragonality c/a gradually increases with decreasing temperature, and is approximately 1.005 at 10 K. This is in contrast to the tetragonality c/a < 1 generally observed in the FCT martensite with a degree of order less than 0.8. The spontaneous magnetization increases in association with the transformation. © 2011 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jallcom.2011.06.035

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H. Kato,K. Koyama, K. Takahashi . Crystallization of Nd-Co-B nanocomposite ribbons in high magnetic fields . JOURNAL OF APPLIED PHYSICS109 ( 7 ) 07A726 2011年4月査読

Y. Murano, M. Matsukawa, S. Ohuchi, S. Kobayashi, S. Nimori, R. Suryanarayanan, K. Koyama, N. Kobayashi . Effect of pressure on the magnetic, transport, and thermal-transport properties of the electron-doped manganite CaMn1-xSbxO3 . Phys. Rev. B 83 ( 5 ) 54437 - -13 2011年2月査読

K. Koyama, Y. Mitsui, E.S. Choi, Y. Ikehara, E.C. Palm, K. Watanabe . Change of the equilibrium state of ferromagnetic MnBi by high magnetic fields . J. Alloys. Comp.509 L78 - L80 2011年1月査読

R.Y. Umetsu K. Ito, K. Koyama, T. Kanomata, K. Ishida and R. Kainuma, . Kinetic arrest behavior in martensitic transformation of NiCoMnSn metamagnetic shape memory alloy . J. Alloys and Comp.509 1389 - 1393 2011年1月査読

M. Ito, Y. Nagi,N. Kado, S. Urakawa,T. Ogawa, A. Kondo,K. Koyama, K. Watanabe, K. Kindo . Magnetic properties of spinel FeCr(2)S(4) in high magnetic field . JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS323 ( 24 ) 3290 - 3293 2011年査読

Koshi Takenaka, Takashi Shibayama, Kazuko Asano, Keiichi Koyama . Magnetostructural Correlations in Nitrogen-Deficient Antiperovskite Mn3CuN1-delta . JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN79 ( 7 ) 2010年7月査読

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：PHYSICAL SOC JAPAN

Ferromagnetic shape memory effects of antiperovskite Mn3CuN are markedly altered by nitrogen deficiency. The martensitic transformation occurs at a lower temperature than ferromagnetic ordering for nitrogen-deficient Mn3CuN0.8, although they both occur simultaneously for stoichiometric Mn3CuN. In the martensitic phase, Mn3CuN0.8 contracts in a direction parallel to the magnetic field, in contrast to the expansion observed in Mn3CuN, implying that the easy axis is converted from the longer a axis in Mn3CuN to the shorter c axis in Mn3CuN0.8. The operating magnetic field for magnetostriction drastically decreases for Mn3CuN0.8, suggesting a possible supermagnetostriction around the critical compositional region for the easy-axis conversion.

DOI： 10.1143/JPSJ.79.073706

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H Nishihara, Y Furutani, T Wada, T Kanomata, K Kobayashi, R Kainuma, K Ishida, K Koyama, K Watanabe . Hyperfine coupling constant for 59Co estimated from a high-field susceptibility and high-field NMR shift in ferromagnetic Co2TiGa and Co2VGa . J. Phys. Conf. Ser.200 32052 2010年1月査読

K. Takenaka, T. Shibayama, K. Asano and K. Koyama . Magnetostructural Correlations in Nitrogen-Deficient Antiperovskite Mn3CuN1-δ . J. Phys. Soc. Jpn.79 73706 2010年査読

Y.Mitsui, K. Koyama, W. Ito, R.Y. Umetsu, R. Kainuma, K. Watanabe . Observation of Reverse Transformation in Metamagnetic Shape Memory Alloy Ni40Co10Mn34Al16 by High-Field X-Ray Diffraction Measurements . Materials Transactions51 1648 - 1650 2010年査読

M. Fukuhara, H. Yoshida, K. Koyama, A. Inoue, Y. Miura . Superconductivity of Ni-Nb-Zr-H Glassy Alloys with Nanoclusters . J. Nanosci. Nanotech.10 4975 - 4978 2010年査読

K. Watanabe, S. Awaji, K. Koyama, G. Nishijima, K. Takahashi K, and Y. Sasaki . Tohoku High Magnetic Field Research Activities Using Cryogen-Free Superconducting Magnets . J. Low Temp. Phys.159 370 - 373 2010年査読

M. Fukuhara, H. Yoshida, K. Koyama, A. Inoue, and Y. Miura . Electronic transport behaviors of Ni-Nb-Zr-H glassy alloys . J. Appl. Phys.107 33703 2010年査読

T. Shigeoka, T. Fujiwara, K. Koyama, K. Watanabe, and Y. Uwatoko . High Field Metamagnetism of PrRh2Si2 Single Crystal Compound Having Anomalously High NSel Temperature . J. Low Temp. Phys.159 42 - 45 2010年査読

A.V. Andreev, E.A. Tereshina, E. Santava, J. Sebek, K. Koyama, and K. Watanabe . Sublattice contributions to the magnetism of UFe5Al7 and UFe6Al6 . J. Alloys Comp. 492 52 - 55 2010年査読

X. Xu, W. Ito, R.Y. Umetsu, K. Koyama, R. Kainuma, and K. Ishida . Kinetic Arrest of Martensitic Transformation in Ni33.0Co13.4Mn39.7Ga13.9 Metamagnetic Shape Memory Alloy . Mater. Trans.51 469 - 471 2010年査読

M. Fukuhara, H. Yoshida, K. Koyama, A. Inoue . Magnetic-field-induced Coulomb oscillation in Ni-Nb-Zr-H glassy alloys . Physica B405 3791 - 3794 2010年査読

P.J. Shamberger, A.B. Pakhomov, K. Koyama, F.S. Ohuchi . Deviation of the magnetization change from the structural phase transition temperature in polycrystalline Ni-Mn-Sn in low magnetic fields . Scripta Materialia63 1161 - 1164 2010年査読

M. Yamamoto, T. Fukuda, T. Kakeshita, K. Koyama, H. Nojiri . Martensitic transformation in invar Fe3Pt with highly ordered state . Physics Procedia10 117 - 119 2010年査読

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Elsevier B.V.

We have investigated martensitic transformation in a highly ordered Fe 3Pt by X-ray diffraction measurements. We found that a new type of FCT martensite phase appears in Fe3Pt with degree of order S = 0.88. In this martensite phase, the tetragonality c/a of the martensite is approximately 1.005 at 10 K, being different from that of so far known FCT martensite phase with c/a &lt
1.

DOI： 10.1016/j.phpro.2010.11.085

Web of Science

Scopus

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