Magnetism of d-Electron System with Orbital Degeneracy ; Constant Coupling Approximation for Inagaki's Model
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概要
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The model expressed by the Hamiltonia H=-Σ__<<ij>>{2J_s(S_i・S_j)+2J_T(T_i・T_j)+8J_0(S_i・S_j)(T_i・T_j)}, which is introduced by Inagaki for the discussion of the d-electron system with doubly degenerate orbitals, is investigated by the constant coupling approximation. The result is quite different from that of the molecular field approximation, showing that the effect of the short range order is very important in this system. Especially in the case when all exchange integrals are megative and their magnitudes are slightly differeent with ∣J_T∣>∣J_0∣>∣J_S∣, it is shown that the ferromagnetic ordering in S occurs first in contrast to the result of Inagaki that the antiferromagnetic ordering in T occurs first.
- 社団法人日本物理学会の論文
- 1976-05-15
著者
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Takano Fumihiko
Institute Of Physics Tokyo University Of Education
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Uchinami Mamoru
Department Of Physics Tokyo University Of Education
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Takano Fumihiko
Institute Of Physics The University Of Tsukuba
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