CRITICAL PROPERTIES OF THE D-DIMENSIONAL ISING-MODEL FROM A VARIATIONAL METHOD

被引：0
|
作者：
BONNIER, B
HONTEBEYRIE, M
机构：
来源：
JOURNAL DE PHYSIQUE I | 1991年 / 1卷 / 03期
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中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We derive a perturbative expansion for the free energy of the d-dimensional ising model in a constant magnetic field which, at finite order, depends upon a parameter lambda. This series is expected to improve the standard high-temperature expansion as the model is independent of lambda, which is used as a variational parameter. The improvement is particularly significant on the range d < 2, as shown by the computation of the exponents delta and nu.
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页码：331 / 338
页数：8
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