Uniaxially anisotropic antiferromagnets in a field on a square lattice

Details Uniaxially anisotropic antiferromagnets in a field on a square lattice Uniaxially anisotropic antiferromagnets in a field on a square lattice

2008-01-21

arxiv.org/abs/0801.3217v1

Physics

Condensed Matter

Statistical Mechanics

8 pages, 9 figures, submitted to Eur. Phys. J. B

Scientific paper

10.1140/epjb/e2008-00149-2

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.

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