Bond operator theory for the frustrated anisotropic Heisenberg antiferromagnet on a square lattice

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:324

Article

Pires, A. S. T.

关键词: Heisenberg model;    XY model;    Antiferromagnet;    Quantum phase transition;   

DOI  :  10.1016/j.jmmm.2012.02.008

来源: Elsevier

【 摘 要 】

The quantum anisotropic antiferromagnetic Heisenberg model with single ion anisotropy, spin S=1 and up to the next-next-nearest neighbor coupling (the J(1)-J(2)-J(3) model) on a square lattice, is studied using the bond-operator formalism in a mean field approximation. The quantum phase transitions at zero temperature are obtained. The model features a complex T=0 phase diagram, whose ordering vector is subject to quantum corrections with respect to the classical limit. The phase diagram shows a quantum paramagnetic phase situated among Neel, spiral and collinear states. (C) 2012 Elsevier B.V. All rights reserved.

【 授权许可】

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