Exchange frustration effect due to anisotropies on the spin-1/2 J1 - J1′ - J2 model

被引：2
作者：
Rufo, S. [1 ]
Ricardo de Sousa, J. [2 ,3 ]
Plascak, J. A. [4 ,5 ,6 ]
机构：
[1] Ctr Brasileiro Pesquisas Fis, Rua Xavier Sigaud 150 Urca, BR-22290180 Rio De Janeiro, RJ, Brazil
[2] Univ Fed Amazonas, 3000 Japiim, BR-69077000 Manaus, Amazonas, Brazil
[3] Natl Inst Sci & Technol Complex Syst, Rua Xavier Sigaud 150, BR-22290180 Rio De Janeiro, RJ, Brazil
[4] Univ Fed Minas Gerais, Dept Fis, CP 702, BR-30123970 Belo Horizonte, MG, Brazil
[5] Univ Fed Paraiba, Dept Fis, Caixa Postal 5008, BR-58051900 Joao Pessoa, Paraiba, Brazil
[6] Univ Georgia, Dept Phys & Astron, Athens, GA 30602 USA
来源：
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS | 2019年 / 518卷
关键词：
Magnetic frustrated systems; Anisotropic Heisenberg model; Variational method; Exchange frustration; J(1)-J(2) HEISENBERG-ANTIFERROMAGNET; VALENCE-BOND; EXACT-DIAGONALIZATION; GROUND-STATES; ORDER;
D O I：
10.1016/j.physa.2018.12.015
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The ground state magnetic properties of the J(1) - J(1)' - J(2) spin-1/2 Heisenberg antiferro-magnetic model with exchange anisotropies is studied on the square lattice. Independent exchange anisotropies are included for first and second neighbors. The zero temperature phase diagram is obtained from a simple variational method based on a trial vector for the ground state. The data point out that these exchange anisotropies play an important role regarding not only the transitions between the ordered and the quantum disordered phases, but also the area of existence of the corresponding quantum disordered phase. This effect reveals the presence of an additional frustration, the so-called exchange frustration. (C) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码：349 / 362
页数：14
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