Ising Model and Bethe Approximation in Itinerant-Electron Systems. II. Iron and Nickel
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概要
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Various magnetic properties of Fe and Ni are studied on the basis of the previously developed theory which takes account of the nonlocal spin fiuctuation due to neighboring pair interactions. Calculated reductions of T_c are 14% for Fe and 2 % for Ni, the SRO at T_c are 0.17 for Fe and 0.13 for Ni. The SRO causes the peak of the specific heat C_v at T_c higher than that in the single site theory, the slight decrease of C_v in the paramagnetic state near T_c with increasing temperatures and an downward convexity of the inverse susceptibility of Ni near T_c. It is also found that the effect of the SRO on the amplitude of the local moment, which never exist in the simple Ising model, causes the negative electronic contribution to the thermal expansion coefficient of Fe above T_c.
- 社団法人日本物理学会の論文
- 1981-11-15
著者
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Kakehashi Yoshiro
Department Of Physics And Earth Sciences Faculty Of Science University Of Ryukyus
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Kakehashi Yoshiro
Department Of Physics Faculty Of Science Osaka University
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