Polarization of the spin-S exchange-interaction model

H. H. Chen, Shih-Chuan Gou, Y. C. Chen

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10 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)8323-8328
Number of pages6
JournalPhysical Review B
Issue number13
Publication statusPublished - 1992 Jan 1

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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