Field dependence of the susceptibility maximum in the anisotropic Heisenberg ferromagnet

被引：14

作者：

Hu, Ai-Yuan ^{[1
]}

Chen, Yuan ^{[1
]}

Peng, Li-Jun ^{[1
]}

机构：

[1] Guangzhou Univ, Dept Phys, Guangzhou 510006, Peoples R China

来源：

PHYSICA B-CONDENSED MATTER | 2007年 / 393卷 / 1-2期

基金：

中国国家自然科学基金;

关键词：

Heisenberg ferromagnet; anisotropy; susceptibility;

D O I：

10.1016/j.physb.2007.01.026

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The location and height of the susceptibility maximum for anisotropic one and two-dimensional spin S = 1/2 Heisenberg models are investigated by using the Green's function treatment within the random phase approximation. The results are fitted to the power law behaviors, T-m(%) - T-0 = ah(y) and chi(T-m(%)) = bh(-beta) in the high field. And the exponents gamma, beta are found to be dependent of the anisotropy. Our results do not support the 2/3 power laws which are obtained from the mean-field Landau's theory. For the isotropic and Ising cases, the exponents gamma, beta which are in agreement with the results by other theoretic techniques. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：368 / 372

页数：5

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