The spin-1 anisotropic Heisenberg antiferromagnet on a square lattice at low temperatures

被引：27
|
作者：
Pires, A. S. T. [1 ]
机构：
[1] Univ Fed Minas Gerais, Dept Fis, ICEx, BR-30123970 Belo Horizonte, MG, Brazil
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2011年 / 323卷 / 15期
关键词：
Heisenberg model; Antiferrromagnet; Quantum phase transition; MODEL;
D O I：
10.1016/j.jmmm.2011.02.036
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this paper we study the low temperature behavior of the quantum S=1 Heisenberg antiferromagnet with exchange and single-site anisotropies on the square lattice. The properties of the model change drastically as the single-site anisotropy D varies from very small to very large values. A quantum phase transition takes place at a critical value D=D-C. We study the low D phase using a self-consistent harmonic approximation and a schematic phase diagram is proposed. (C) 2011 Elsevier B.V. All rights reserved.
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页码：1977 / 1979
页数：3
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