Antiferromagnets at low Temperatures
Abstract
The low-temperature properties of the Heisenberg antiferromagnet in 2+1 space-time dimensions are analyzed within the framework of effective Lagrangians. It is shown that the magnon-magnon interaction is very weak and repulsive, manifesting itself through a term proportional to five powers of the temperature in the pressure. The structure of the low-temperature series for antiferromagnets in 2+1 dimensions is compared with the structure of the analogous series for antiferromagnets in 3+1 dimensions. The model-independent and systematic effective field theory approach clearly proves to be superior to conventional condensed matter methods such as spin-wave theory.
Keywords
Cite
@article{arxiv.1101.2919,
title = {Antiferromagnets at low Temperatures},
author = {Christoph P. Hofmann},
journal= {arXiv preprint arXiv:1101.2919},
year = {2011}
}
Comments
Presented at 12th Mexican Workshop on Particles and Fields, Mazatlan, Sinaloa, Mexico, 9-14 Nov 2009