Phase transitions in two-dimensional anisotropic quantum magnets

Details Phase transitions in two-dimensional anisotropic quantum magnets Phase transitions in two-dimensional anisotropic quantum magnets

2001-01-29

arxiv.org/abs/cond-mat/0101430v1

Eur. Phys. J. B 20, 55 (2001)

Physics

Condensed Matter

Statistical Mechanics

To be published on Eur. Phys. J. B

Scientific paper

We consider quantum Heisenberg ferro- and antiferromagnets on the square lattice with exchange anisotropy of easy-plane or easy-axis type. The thermodynamics and the critical behaviour of the models are studied by the pure-quantum self-consistent harmonic approximation, in order to evaluate the spin and anisotropy dependence of the critical temperatures. Results for thermodynamic quantities are reported and comparison with experimental and numerical simulation data is made. The obtained results allow us to draw a general picture of the subject and, in particular, to estimate the value of the critical temperature for any model belonging to the considered class.

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