Specific Heat Study of Metal-Insulator Transition in Antiferromagnetic Phase of NiS_<1.48>Se_<0.52>
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概要
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We prepared a highly homogeneous polycrystal sample of NiS....Se..,. in a sensethat it undergoes, with increasing temperature, a sharp transition from metal to in-sulator (M-I) at 38.2 K in the antiferromagnetic phase (T. - 65 K). The specific heatwas measured on a sintered sample from 4.2 to 70 K. The obtained coefficient of thelinear electronic specific heat, y, is as large as 33 mJ/K' mole, and the Debyetemperature determined below 20 K is 375 K. Such a large value of y suggests a strongenhancement due to electron correlations. A clear latent heat of 38 J/mole was ob-served at the M-I transition. The corresponding entropy change is l J/K mole, pro-bably mainly electronic. The magnetic specific heat was also observed and themagnetic entropy was estimated at 1.7 J/K mole. The present results support that theM-I transition in NiS....Se..,. is the Molt transition.
- 社団法人日本物理学会の論文
- 1986-06-15
著者
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MIYAKO Yoshihito
Department of Physics, Faculty of Science, Osaka University
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NISHIOKA Takashi
Department of Material Science, Faculty of Science, Kochi University
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MIYADAI Tomonao
Department of Physics,Faculty of Science,Hokkaido University
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Miyako Yoshihito
Department Of Earth And Space Science Faculty Of Science Osaka University
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Nishioka Takashi
Department Of Applied Physics Graduate School Of Engineering Osaka City University
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SUDO Shuji
Department of Physics,Faculty of Science,Hokkaido University
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Miyadai Tomonao
Department Of Physics Faculty Of Science Hokkaido University
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Sudo Shuji
Department Of Physics Faculty Of Science Hokkaido University
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Miyadai Tomonao
Department Of Physics Faculity Of Science Hokkaido University
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NISHIOKA Takashi
Department of Physics,Faculty of Science,Hokkaido University
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