PHASE-TRANSITIONS IN THE 3-STATE ANTIFERROMAGNETIC POTTS-MODEL

The three-state antiferromagnetic Potts model on the simple cubic latt ice is studied by the Monte Carlo method using a new order parameter a nd employing the histogram technique. It is shown that apart from the low-temperature broken-sublattice-symmetry phase with nonequivalent su blattices, another type of ordering with equivalent sublattices does e xist in the model between the broken-sublattice-symmetry and disordere d phases. The temperature of the transition between the ordered phases is estimated from the histogram of the order parameter. The value obt ained is in good agreement with that obtained from cluster variation c alculations.