The pure-quantum self-consistent harmonic approximation, a semiclassical method based on the path-integral formulation of quantum statistical mechanics, is applied to the study of the thermodynamic behaviour of the quantum Heisenberg antiferromagnet on the square lattice (QHAF). Results for various properties are obtained for different values of the spin and successfully compared with experimental data.
@article{arxiv.cond-mat/9812041,
title = {The quantum Heisenberg antiferromagnet on the square lattice},
author = {A. Cuccoli and V. Tognetti and P. Verrucchi and R. Vaia},
journal= {arXiv preprint arXiv:cond-mat/9812041},
year = {2009}
}
Comments
Proceedings of the Conference "Path Integrals from peV to TeV - 50 Years from Feynman's paper" (Florence, August 1998) -- 2 pages, ReVTeX, 2 figures