Phase Diagram in a Random Mixture of Two Antiferromagnets with Competing Spin Anisotropies. I

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概要

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• The phase diagram of a random mixture of two antiferromagnets with competing spin anisotropies (A_<1 - x>B_x) has been analyzed by extehding the theory of Matsubara and Inawashiro, and Oguchi and Ishikawa. In the model assumed, the anisotropy energies are expressed by the anisotropic exchange interactions. According to this formulation, it has been shown that the concentration dependence of T_N becomes a function of 〓^η_<PQ>(〓^η_<PQ>≡(2zS_P(S_P+1)・2zS_Q(S_Q+1))^<1/2>. J^η_<PQ>/3, where P, Q=A, B; S_P is a magnitude of P-spin, and J^η_<PQ> is a η component of exchange integral between P- and Q-spin). Further, the phase boundary between an AF phase and an OAF (oblique antiferromagnetic) phase at T= 0 K has been shown to be determined by α(≡S_B/S_A), if 〓^η_<PQ> are given. The obtained phase diagrams for Fe_<1 - x>Co_xCl_2, K_2Mn_<1 - x>Fe_xF_4 and Fe_<1 - x>Co_xCl_2・2H_2O are compared with the experimental ones.

• 社団法人日本物理学会の論文
• 1981-12-15

著者

• Someya Yoshiko

  The Doctoral Research Course In Human Culture Ochanomizu University

関連論文

• Mossbauer Study of a Random Mixture with Orthogonal Spin Anisotropies: Fe_Co_xCl_2・2H_2O
• Mossbauer Study of the Perovskite Compound RbFeF_3: Magnetic Structure in the Phase below 39 K and Temperature Dependence of Hyperfine Parameters below the Neel Temperature
• Phase Diagram in a Random Mixture of Two Antiferromagnets with Competing Spin Anisotropies : Evaluation of Tetracritical Concentration and Temperature, and of Critical Concentration at T=0 K
• Phase Diagram in a Random Mixture of Two Antiferromagnets with Competing Spin Anisotropies. I

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