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Multicritical behavior of two-dimensional anisotropic antiferromagnets in a magnetic field

Pelissetto, Andrea and Vicari, Ettore (2007) Multicritical behavior of two-dimensional anisotropic antiferromagnets in a magnetic field. Physical review. B, Condensed matter and materials physics, 76 . 024436. ISSN 1550-235X

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Abstract

We study the phase diagram and multicritical behavior of anisotropic Heisenberg antiferromagnets on a square lattice in the presence of a magnetic field along the easy axis. We argue that, beside the Ising and XY critical lines, the phase diagram presents a first-order spin-flop line starting from T=0, as in the three-dimensional case. By using field theory we show that the multicritical point where these transition lines meet cannot be O(3) symmetric and occurs at finite temperature. We also predict how the critical temperature of the transition lines varies with the magnetic field and the uniaxial anisotropy in the limit of weak anisotropy.

Item Type: Article
Additional Information: Imported from arXiv
Subjects: UNSPECIFIED
Divisions: Dipartimenti (until 2012) > DIPARTIMENTO DI FISICA " E. FERMI"
Depositing User: dott.ssa Sandra Faita
Date Deposited: 08 Apr 2015 10:20
Last Modified: 08 Apr 2015 10:25
URI: http://eprints.adm.unipi.it/id/eprint/1746

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