Two-dimensional anisotropic Heisenberg antiferromagnet in a field

Details Two-dimensional anisotropic Heisenberg antiferromagnet in a field Two-dimensional anisotropic Heisenberg antiferromagnet in a field

2005-06-02

arxiv.org/abs/cond-mat/0506057v1

Phys. Rev. B 72, 064443 (2005)

Physics

Condensed Matter

Statistical Mechanics

8 pages, 9 figures

Scientific paper

10.1103/PhysRevB.72.064443

The classical, square lattice, uniaxially anisotropic Heisenberg antiferromagnet in a magnetic field parallel to the easy axis is studied using Monte Carlo techniques. The model displays a long-range ordered antiferromagnetic, an algebraically ordered spin-flop, and a paramagnetic phase. The simulations indicate that a narrow disordered phase intervenes between the ordered phases down to quite low temperatures. Results are compared to previous, partially conflicting findings on related classical models as well as the quantum variant with spin S=1/2.

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