Abstract
Specific heat measurement was performed on Fe (1- x ) Co x Cl 2 ·2H 2 O 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 ) Co x Cl 2 ·2H 2 O 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.
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