Evidence for a bicritical point in the XXZ Heisenberg antiferromagnet on a simple cubic lattice

Details Evidence for a bicritical point in the XXZ Heisenberg antiferromagnet on a simple cubic lattice Evidence for a bicritical point in the XXZ Heisenberg antiferromagnet on a simple cubic lattice

2011-01-11

arxiv.org/abs/1101.2127v2

Phys. Rev. E83, 042102 (2011)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 6 figures (to appear in the Phys. Rev. E (2011))

Scientific paper

10.1103/PhysRevE.83.042102

The classical Heisenberg antiferromagnet with uniaxial exchange anisotropy, the XXZ model, in a magnetic field on a simple cubic lattice is studied with the help of extensive Monte Carlo simulations. Analyzing, especially, various staggered susceptibilities and Binder cumulants, we present clear evidence for the meeting point of the antiferromagnetic, spin--flop, and paramagnetic phases being a bicritical point with Heisenberg symmetry. Results are compared to previous predictions based on various theoretical approaches.

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