Thermodynamics of the quantum easy-plane antiferromagnet on the triangular lattice
Statistical Mechanics
2009-10-31 v1
Abstract
The classical XXZ triangular-lattice antiferromagnet (TAF) shows both an Ising and a BKT transition, related to the chirality and the in-plane spin components, respectively. In this paper the quantum effects on the thermodynamic quantities are evaluated by means of the pure-quantum self-consistent harmonic approximation (PQSCHA), that allows one to deal with any spin value through classical MC simulations. We report the internal energy, the specific heat, and the in-plane correlation length of the quantum XX0 TAF, for S=1/2, 1, 5/2. The quantum transition temperatures turn out to be smaller the smaller the spin, and agree with the few available theoretical and numerical estimates.
Keywords
Cite
@article{arxiv.cond-mat/9902024,
title = {Thermodynamics of the quantum easy-plane antiferromagnet on the triangular lattice},
author = {L. Capriotti and A. Cuccoli and V. Tognetti and P. Verrucchi and R. Vaia},
journal= {arXiv preprint arXiv:cond-mat/9902024},
year = {2009}
}
Comments
4 pages,3 postscript figures