SPECIFIC-HEAT MEASUREMENT ON A RANDOM MIXTURE OF 2 ANTI-FERROMAGNETS WITH COMPETING ANISOTROPIES

被引：48

作者：

KOBAYASHI, M ^{[1
]}

KATSUMATA, K ^{[1
]}

SATO, T ^{[1
]}

MIYAKO, Y ^{[1
]}

机构：

[1] HOKKAIDO UNIV,FAC SCI,DEPT PHYS,SAPPORO,HOKKAIDO 060,JAPAN

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1979年 / 46卷 / 05期

关键词：

D O I：

10.1143/JPSJ.46.1467

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Specific heat measurement was performed on Fe(1−x)Co2Cl2·2H2O 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≲10 K, 0.3≲x≲0.8) are found. The phase diagram shows clearly the existence of a tetracritical point. The critical lines in Fe(1−x)Co2Cl2·2H2O 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. © 1979, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.

引用

页码：1467 / 1473

页数：7

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