Uniaxially anisotropic antiferromagnets in a field on a square lattice

M. Holtschneider and W. Selke ()

The European Physical Journal B: Condensed Matter and Complex Systems, 2008, vol. 62, issue 2, 147-154

Abstract: Classical uniaxially anisotropic Heisenberg and XY antiferromagnets in a field along the easy axis on a square lattice are analysed, applying ground state considerations and Monte Carlo techniques. The models are known to display antiferromagnetic and spin-flop phases. In the Heisenberg case, a single-ion anisotropy is added to the XXZ antiferromagnet, enhancing or competing with the uniaxial exchange anisotropy. Its effect on the stability of non-collinear structures of biconical type is studied. In the case of the anisotropic XY antiferromagnet, the transition region between the antiferromagnetic and spin-flop phases is found to be dominated by degenerate bidirectional fluctuations. The phase diagram is observed to resemble closely that of the XXZ antiferromagnet without single-ion anisotropy. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2008

Keywords: 68.35.Rh Phase transitions and critical phenomena; 75.10.Hk Classical spin models; 05.10.Ln Monte Carlo methods (search for similar items in EconPapers)
Date: 2008
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DOI: 10.1140/epjb/e2008-00149-2

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