SELF-CONSISTENT MEAN-FIELD APPROXIMATION FOR THE SQUARE-LATTICE FRUSTRATED HEISENBERG-MODEL

被引:4
|
作者
CUI, SM [1 ]
机构
[1] JIAO TONG UNIV,DEPT PHYS,INST CONDENSED MATTER,SHANGHAI 200030,PEOPLES R CHINA
关键词
D O I
10.1088/0953-8984/4/28/003
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
A self-consistent mean-field method is used to obtain the phase diagram of the frustrated antiferromagnetic Heisenberg model with next-nearest-neighbour exchange couplings on a square lattice at zero temperature starling with a Holstein-Primakoff transformation. It is suggested that the Neel-type order is not destroyed for any value of the ratio of the nearest- to next-nearest-neighbour exchange couplings for S greater-than-or-equal-to 1, while for S = 1/2 there may exist a disordered phase for strong frustration.
引用
收藏
页码:L389 / L394
页数:6
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