Classical and quantum anisotropic Heisenberg antiferromagnets

Details Classical and quantum anisotropic Heisenberg antiferromagnets Classical and quantum anisotropic Heisenberg antiferromagnets

2009-07-06

arxiv.org/abs/0907.1076v1

Condensed Matter Physics 12, 547 (2009)

Physics

Condensed Matter

Statistical Mechanics

13 pages, 14 figures, conference

Scientific paper

We study classical and quantum Heisenberg antiferromagnets with exchange anisotropy of XXZ-type and crystal field single-ion terms of quadratic and cubic form in a field. The magnets display a variety of phases, including the spin-flop (or, in the quantum case, spin-liquid) and biconical (corresponding, in the quantum lattice gas description, to supersolid) phases. Applying ground-state considerations, Monte Carlo and density matrix renormalization group methods, the impact of quantum effects and lattice dimension is analysed. Interesting critical and multicritical behaviour may occur at quantum and thermal phase transitions.

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