HIGH TEMPERATURE EXPANSIONS OF SPIN CORRELATION FUNCTIONS FOR ISING AND HEISENBERG FERROMAGNETS

被引：6

作者：

BINDER, K

机构：

[1] Atominstitut der Österreichischen Hochschulen, Vienna

来源：

PHYSICA STATUS SOLIDI | 1969年 / 32卷 / 02期

关键词：

D O I：

10.1002/pssb.19690320243

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Linked cluster expansions are given for the static spin pair correlation functions in the case of Ising and Heisenberg interactions. Formulae valid for general values S of the spin are derived including terms of fifth order in 1/(kT). These expansions are discussed numerically in the temperature region Tc/T ≦ 1/2 for the simple cubic, the body‐centered cubic and the face‐centered cubic lattice assuming interactions between nearest neighbours only. A comparison with the usual Ornstein‐Zernike treatments shows considerable deviations due to the anisotropy of the correlations. This anisotropy can be neglected only in the immediate neighbourhood of the critical temperature Tc. Copyright © 1969 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：891 / &

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