Abstract
The critical temperature of the antiferromagnetic
q
-state Potts model on the square lattice is located, and the critical free energy and internal energy are evaluated. As with the ferromagnetic model, the transition is continuous for
q
≼4, and its first-order (i. e. has latent heat) for
q
>4. However, only for
q
≼3 can the critical temperature be real. For the isotropic model the criticality condition is exp(
J
/
k
T
) = -1 + (4-
q
)
½
.
Cited by
161 articles.
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