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    National Tsing Hua University Institutional Repository > 歷任校長 > 陳信雄 (1997-1998) > 期刊論文 >  Constant-Coupling Approximation of the Exchange-Interaction Model of Ferromagnetism

    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/80748

    Title: Constant-Coupling Approximation of the Exchange-Interaction Model of Ferromagnetism
    Authors: H.H. Chen;F. Lee
    教師: 陳信雄
    Date: 1993
    Publisher: American Physical Society
    Relation: PHYSICAL REVIEW B, American Physical Society, Volume 48, Issue 13, OCT 1 1993, Pages 9456-9461
    Abstract: The ferromagnetic-exchange-interaction model is studied by the Oguchi method and the constant-coupling approximation (CCA). The polarization q(T), which describes the ordering of the model, is determined for various spins. The phase transition is first order for all spins S greater-than-or-equal-to 1. The transition temperature obtained with the CCA is kT(c)/J = 2/{lnS(2S - 1) - ln[(2S)(zeta) - S(2S + 1)]}, where zeta depends on the lattice coordination number z and is given by zeta = 2(z - 1 )/z. Both the CCA and the Oguchi method show that the discontinuity of q at T(c) is q(c) = (2S - 1)/2S, which is exactly the same as the mean-field result.
    Relation Link: http://www.aps.org/
    URI: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/80748
    Appears in Collections:[陳信雄 (1997-1998)] 期刊論文
    [物理系] 期刊論文

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