Ising Model and Bethe Approximation in Itinerant-Electron Systems. I
1981 年 50 巻 5 号 p. 1505-1512
詳細
1981 年 50 巻 5 号 p. 1505-1512
It is shown that the decoupling approximation in functional integral method, which has been used by Hasegawa, leads to a generalized Ising model in itinerant-electron systems, and then a new theory to go beyond the single-site approximation is proposed. It is based on the Bethe approximation in Ising model. Present theory gives SRO of 0.1∼0.2 for Fe, Co and Ni at T∼Tc.
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