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題名: Polarization of the Spin-S Exchange-interaction Model
作者: Chen, H. H.;Gou, Shih-Chuan;Chen, Y. C.
貢獻者: 物理學系
日期: 1992-10
上傳時間: 2012-12-10T02:26:19Z
出版者: The American Physical Society
摘要: The spin-S exchange interaction model of ferromagnetism is studied by the mean-field approximation. This model has 4S(S+1) order parameters, and has infinitely many ground-state configurations. We define a single polarization parameter to describe the ordering of the system. Thermal variation of the polarization q(T) is determined for various spins. The phase transition is first order (except for S=1/2) with phase transition temperature kTc/Jz=(2S-1)/(4S ln2S), where z is the coordination number, and the discontinuity of q at Tc is qc=(2S-1)/2S.
關聯: Physical Review B, 46(13): 8323-8328
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