Frustration and quantum phase transitions in an anisotropic antiferromagnet on a square lattice

We study the effect of frustration between nearest and next-nearest neighbors of the quantum S=1 anisotropic Heisenberg model on a square lattice using the bond operator technique. A single-site anisotropy term induces a quantum phase transition in the system. We calculate the effect of zero-temperature quantum fluctuations on the magnetization for the Néel and collinear antiferromagnetic phases.

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Year of publication:	2011
Authors:	Pires, A.S.T.
Published in:	Physica A: Statistical Mechanics and its Applications. - Elsevier, ISSN 0378-4371. - Vol. 390.2011, 15, p. 2787-2793
Publisher:	Elsevier
Subject:	Quantum phase transitions \| Frustration

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Type of publication:	Article
Source:	RePEc - Research Papers in Economics

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