Heisenberg antiferromagnets with exchange and cubic anisotropies

Bannasch, G., Selke, W.
MPI f\"ur Physik komplexer Systeme, 01187 Dresden, Germany; Institut für Theoretische Physik, Technische Hochschule Aachen, D-52056 Aachen, Germany


We study classical Heisenberg antiferromagnets with uniaxial exchange anisotropy and a cubic anisotropy term on simple cubic lattices in an external magnetic field using ground state considerations and extensive Monte Carlo simulations. In addition to the antiferromagnetic phase field--induced spin--flop and non--collinear, biconical phases may occur. Phase diagrams and critical as well as multicritical phenomena are discussed. Results are compared to previous findings.