Phase transitions in two-dimensional anisotropic quantum magnets
Statistical Mechanics
2015-06-24 v1 Strongly Correlated Electrons
Abstract
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.
Cite
@article{arxiv.cond-mat/0101430,
title = {Phase transitions in two-dimensional anisotropic quantum magnets},
author = {A. Cuccoli and T. Roscilde and V. Tognetti and R. Vaia and P. Verrucchi},
journal= {arXiv preprint arXiv:cond-mat/0101430},
year = {2015}
}
Comments
To be published on Eur. Phys. J. B