Specific Heat Measurement on a Random Mixture of Two Antiferromagnets with Competing Anisotropies
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概要
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Specific heat measurement was performed on Fe(1-x)CoxCl2$\cdot$2H2O system, which is a random mixture of two antiferromagnets with competing spin anisotropies. The temperature vs concentration phase diagram of this mixture is constructed from the measurement of the anomalies in the specific heat. Three kinds of order phases i.e., Fe-rich and Co-rich antiferromagnetic phases and a new ordered one ($T{\lesssim}10$ K, $0.3{\lesssim}x{\lesssim}0.8$) are found. The phase diagram shows clearly the existence of a tetracritical point. The critical lines in Fe(1-x)CoxCl2$\cdot$2H2O system become roughly straight ones near the tetracritical point and meet at an angle, not tangentially. The magnetic specific heat and the magnetic entropy of the mixture are obtained.
- Physical Society of Japanの論文
- 1979-05-15
著者
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Katsumata Koichi
Research Institute Of Applied Electricity Hokkaido University
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Miyako Yoshihito
Department Of Earth And Space Science Faculty Of Science Osaka University
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Sato Toshikazu
Department Of Physics Faculty Of Science Hokkaido University
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Katsumata Koichi
Research Institute of Applied Electricity, Hokkaido University, Sapporo 060
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Miyako Yoshihito
Department of Physics, Faculty of Science, Hokkaido University, Sapporo 060
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Kobayashi Makoto
Research Institute of Applied Electricity, Hokkaido University, Sapporo 060
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