Classical and quantum two-dimensional anisotropic Heisenberg antiferromagnets
作者： M. Holtschneider , S. Wessel , W. Selke
DOI: 10.1103/PHYSREVB.75.224417
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摘要: The classical and the quantum, spin $S=\frac{1}{2}$, versions of uniaxially anisotropic Heisenberg antiferromagnet on a square lattice in field parallel to easy axis are studied using Monte Carlo techniques. For version, attention is drawn biconical structures fluctuations at low temperatures transition region between antiferromagnetic spin-flop phases. quantum previously proposed scenario first-order phases with critical end point tricritical scrutinized.
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