Real-space renormalization group study of the anisotropic antiferromagnetic Heisenberg model on a square lattice

被引:23
作者
Branco, NS [1 ]
de Sousa, JR
机构
[1] Univ Georgia, Dept Phys & Astron, Ctr Simulat Phys, Athens, GA 30602 USA
[2] Univ Amazonas, Dept Fis, BR-69077000 Manaus, Amazonas, Brazil
[3] Univ Fed Santa Catarina, Dept Fis, BR-88040900 Florianopolis, SC, Brazil
关键词
D O I
10.1103/PhysRevB.62.5742
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In this work we apply two different real-space renormalization-group (RSRG) approaches to the anisotropic antiferromagnetic spin-1/2 Heisenberg model on the square lattice. Our calculations allow for an approximate evaluation of the T vs Delta phase diagram: the results suggest the existence of a critical value of Delta>0, at which the critical temperature goes to zero, and the presence of reentrant behavior on the critical line between the ordered and disordered phases. This whole critical line is found to belong to the same universality class as the lsing model. Our results are in accordance with previous RSRG approaches but not with numerical simulations and spin-wave calculations.
引用
收藏
页码:5742 / 5745
页数:4
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