Lebowitz Inequalities for Ashkin-Teller Systems
arXiv:cond-mat/9911046 · doi:10.1016/S0378-4371(99)00516-6
Abstract
We consider the Ashkin-Teller model with negative four-spin coupling but still in the region where the ground state is ferromagnetic. We establish the standard Lebowitz inequality as well as the extension that is necessary to prove a divergent susceptibility.
Ams-TeX, 12 pages; two references added, final version accepted for publication in Physica A