研究者詳細 - 小山　佳一

論文 - 小山　佳一

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H. Fujii, K. Koyama, I. Sasaki, S. Mitsudo and M. Motokawa . Giant magnetic anisotropy in Sm2Fe17 induced by nitrogenation . J. Magn. Soc. Jpn.23 465 - 467 1999年1月査読

T. Sakon, Y. Nakanishi, M. Yoshida, K. Koyama, F. Takahashi, H. Nojiri, D. Li, T. Suzuki and M. Motokawa . dHvA effect and magnetic resonance of GdAs . Physics of strongly correlated electron systems, ed. T. Komatsubara, H. Fujii, Y. Onuki and H. Shiba (Japanese Journal of Applied Physics, Tokyo) 135 - 137 1999年1月

K. Koyama, T. Goto, H. Fujii, H. Fukuda and Y. Janssen . Magnetization measurements of Ce2Fe17 under high pressure and high magnetic fields . J. Magn. Soc. Jpn.23 471 - 473 1999年査読

N. Suzuki, T. Kanomata, R. Konno, T. Kaneko, H. Yamauchi, K. Koyama, H. Nojiri, Y. Yamaguchi and M. Motokawa . Magnetic Phase diagram of CrTe1-xSbx (0.0 ?x ?1.0) . J. Alloys and Compounds290 25 - 29 1999年査読

K. Koyama, T. Goto, T. Kanomata and R. Note . Precise magnetization measurements of single-crystalline FeSi under high pressure . J. Phys. Soc. Jpn. 68 1693 - 1698 1999年査読

K. Koyama, H. Fujii, Y. Makihara, T. Kajitani and Morii . Thermal expansion measurements on rhombohedral Y2Fe17 and Y2Fe17N3.1 . J. Magn. Soc. Jpn.23 468 - 470 1999年査読

K. Umeo, T. Takabatake, T. Pietrus, H. B. Lohneysen, H. Ohmoto, K. Koyama, S. Hane and T. Goto . Pressure-induced quantum phase transition in Ce7Ni3 . Physics of strongly correlated electron systems, ed. T. Komatsubara, H. Fujii, Y. Onuki and H. Shiba (Japanese Journal of Applied Physics, Tokyo) 154 - 156 1999年

N. Suzuki, T. Kanomata, R. Konno, T. Kaneko, H. Yamauchi, K. Koyama, H. Nojiri, Y. Yamaguchi, M. Motokawa . Magnetic phase diagram of CrTe<inf>1-x</inf>Sb<inf>x</inf> (0.0≤x≤1.0) . Journal of Alloys and Compounds290 ( 1-2 ) 25 - 29 1999年

記述言語：英語掲載種別：研究論文（学術雑誌）

Measurements of the high field magnetization of CrTe1-xSbx (0.0≤x≤1.0) were carried out at 4.2 K in pulsed magnetic fields up to 300 kOe. The temperature dependence of the magnetization of CrTe1-xSbx was measured in the temperature range from 4.2 K to 800 K. The magnetic phase diagram of CrTe1-xSbx (0.0≤x≤1.0) was determined, which is similar to the typical one for the mixed crystals of the layered antiferromagnetic and ferromagnetic compounds proposed by de Gennes. © 1999 Elsevier Science S.A. All rights reserved.

DOI： 10.1016/S0925-8388(99)00244-3

Scopus

小山佳一, 藤井博信, 光藤誠太郎, 本河光博, 香島純, 安藤由和, CANFIELD P.C. . 窒素侵入型化合物Nd_2Fe_<17>N_3単結晶の磁気異方性 . 日本応用磁気学会誌22 ( 4 ) 345 - 348 1998年4月査読

記述言語：日本語出版者・発行元：公益社団法人日本磁気学会

Single crystals of an interstitially modified nitrogen compound, Nd2Fe17N3, were successfully synthesized for the first time by means of the high-pressure N2 gas nitrogenation technique. High-field magnetization curves along the rhombohedral principal axes for the Nd2Fe17 and Nd2Fe17N3 single crystals at 4.2 K indicated strong anisotropic behaviors, which were analyzed on the basis of a single-ion Hamiltonian including the Zeeman energy, exchange energy, and crystalline electric field (CEF) effect. The results indicate that the second-order CEF coefficient A20 reaches up to −1.5 × 103 K/a20 at 4.2K upon nitrogenation, which is about three times as large as that for Nd2Fe17.

DOI： 10.3379/jmsjmag.22.345

CiNii Books

その他リンク： http://dl.ndl.go.jp/info:ndljp/pid/10463847

T Kamimori, K Koyama, Y Mori, M Asano, K Kinoshita, J Mochimaru, K Konishi, H Tange . Preferential site occupation of M atoms and the Curie temperature in Y2Fe17-xMx (M = Al, Si, Ga) . JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS177 ( Pt.2 ) 1119 - 1120 1998年1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：ELSEVIER SCIENCE BV

The Curie temperature, lattice parameters and the Fe-57 Mossbauer spectra were studied on Y2Fe17-xMx, where M = Al(0 less than or equal to x less than or equal to ), Si(0 less than or equal to x less than or equal to 3.5) and Ga(0 less than or equal to x less than or equal to 11). The analysis of Mossbauer spectrum shows the preferential site occupation of M atoms. The preference has little dependence on M. The behavior of the Curie temperature is closely related not to the lattice dimension but to the preferential site occupation of M. (C) 1998 Elsevier Science B.V. All rights reserved.

DOI： 10.1016/S0304-8853(97)00972-4

Web of Science

Scopus

J-GLOBAL

その他リンク： http://orcid.org/0000-0001-9117-5858

K. Koyama, S. Hane, K. Kamishima and T. Goto . Instrument for high resolution magnetization measurements at high pressures, high magnetic fields and low temperatures . Rev. Sci. Instrum.69 3009 - 3014 1998年査読

T. Kamimori, K. Koyama, Y. Mori, M Asano, K. Kinoshita, J. Mochimaru, K. Konishi and H. Tange, . Preferential site occupation of N atoms and the Curie temperature in Y2Fe17-xMx (M=Al, Si, Ga) . J. Magn. Magn. Mater.177-181 1119 - 1120 1998年査読

K. Koyama, T. Goto, H. Fujii, N. Takeshita, N. Mori, H. Fukuda and Y. Janssen . Observation of new magnetic phases in Ce2Fe17 under high pressure and high magnetic fields . J. Phys. Soc. Jpn.67 1879 - 1882 1998年査読

K. Umeo, T. Takabatake, H. Ohmoto, T. Pietrus, H. B. Lohneysen, K. Koyama, S. Hane and T. Goto . Low-temperature specific heat and magnetic susceptibility near the pressure-induced quantum phase transition in Ce7Ni3 . Phys. Rev. B58 12095 - 12099 1998年査読

小山佳一、藤井博信、光藤誠太郎、本河光博、香嶋純、安藤由和、P.C. Canfield . 窒素侵入型化合物Nd2Fe17N3 単結晶の磁気異方性 . 日本応用磁気学会誌22 345 - 348 1998年査読

K. Koyama, T. Kajitani, Y. Morii, H. Fujii, M. Akayama . Neutron powder diffraction of rhombohedral Y2Fe17 and Y2Fe17N3.1 . Physical Review B55 ( 17 ) 11414 - 11421 1997年5月査読

K. Koyama, T. Kajitani, Y. Morii, H. Fujii and M. Akayama . Neutron powder diffraction of rhombohedral Y2Fe17 and Y2Fe17N3.1 . Phys. Rev. B55 11414 - 11421 1997年査読

K. Koyama, H. Fujii, S. Mitsudo, M. Motokawa, J. Koujima, Y. Andoh and P.C. Canfield . High-field magnetization on interstitially modified single crystals Nd2Fe17Z3 (Z=H and N) . Physica B237-238 548 - 550 1997年査読

H. Fujii, K. Koyama, K. Tatami, S. Mitsudo, M. Motokawa, T. Kajitani, Y. Morii and P.C. Canfield . Recent development of basic magnetism in interstitially-modified rare earth iron nitrides R2Fe17N3 . Recent development of basic magnetism in interstitially-modified rare earth iron nitrides R2Fe17N3237-238 534 - 540 1997年査読

K. Koyama, H. Fujii, S. Suzuki . Magnetic properties of interstitially modified compounds Sm3(Fe,M)29Zx (M  Ti, V, Cr and Z  H or N) . Journal of Magnetism and Magnetic Materials161 118 - 126 1996年8月査読

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