Biconical structures in two-dimensional anisotropic Heisenberg antiferromagnets

Details Biconical structures in two-dimensional anisotropic Heisenberg antiferromagnets Biconical structures in two-dimensional anisotropic Heisenberg antiferromagnets

2007-10-05

arxiv.org/abs/0710.1251v2

Phys. Rev. B 76, 220405(R) (2007)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 5 figures, accepted by Phys. Rev. B

Scientific paper

10.1103/PhysRevB.76.220405

Square lattice Heisenberg and XY antiferromagnets with uniaxial anisotropy in a field along the easy axis are studied. Based on ground state considerations and Monte Carlo simulations, the role of biconical structures in the transition region between the antiferromagnetic and spin--flop phases is analyzed. In particular, adding a single--ion anisotropy to the XXZ antiferromagnet, one observes, depending on the sign of that anisotropy, either an intervening biconical phase or a direct transition of first order separating the two phases. In case of the anisotropic XY model, the degeneracy of the ground state, at a critical field, in antiferromagnetic, spin--flop, and bidirectional structures seems to result, as in the case of the XXZ model, in a narrow disordered phase between the antiferromagnetic and spin--flop phases, dominated by bidirectional fluctuations.

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