Heisenberg antiferromagnets with exchange and cubic anisotropies

TL;DR

This paper investigates classical Heisenberg antiferromagnets with exchange and cubic anisotropies, analyzing phase diagrams and critical phenomena through simulations, revealing complex phase behavior including spin-flop and biconical phases.

Contribution

It introduces a comprehensive study of phase diagrams and multicritical points in anisotropic Heisenberg antiferromagnets using Monte Carlo simulations.

Findings

Identification of spin-flop and biconical phases

Detailed phase diagrams with multicritical points

Comparison with previous theoretical and experimental results

Abstract

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.