title: Evidence for a bicritical point in the XXZ Heisenberg antiferromagnet on a simple cubic lattice.
abstract: The classical Heisenberg antiferromagnet with uniaxial exchange anisotropy (XXZ model) in a field on a simple cubic lattice is studied with the help of extensive Monte Carlo simulations. We analyze, in particular, various staggered susceptibilities and Binder cumulants and present clear evidence for the triple point of the antiferromagnetic, spin-flop, and paramagnetic phases being a bicritical point with Heisenberg symmetry. Results are compared to previous predictions applying various theoretical approaches.
authors: Institut für Theoretische Physik, RWTH Aachen University, 52056 Aachen, Germany.
authors: Walter
authors: W
authors: Selke