Comparison of approximate methods for the study of antiferromagnetism in the fcc lattice

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Abstract
The study of antiferromagnetism in the fcc lattice by means of different approximate methods has resulted in varied and not always consistent results. An improved approximation of the cluster-variation method is used here to calculate the phase diagram of a model fcc system with nearest-neighbor antiferromagnetic interactions. Comparison with recent Monte Carlo simulations indicates that, despite some discrepancies near the triple-point region, the cluster-variation method provides a convenient technique for the study of phase equilibria in three-dimensional systems.