Abstract
We investigate the topology of the phase diagram of binary alloys on the fee lattice with first-neighbor antiferromagnetic interactions around the superdegenerate point, where the L10 and L12 phases meet. We treat the system as a “hard-constraint lattice gas,” following a procedure previously described by Lebowitzet al. We perform cluster variation method calculations in theT→0 limit and Monte Carlo simulations directly atT=0 K on the ground states of the superdegenerate point. We find that: (i) there is no disordered phase in the neighborhood of this point; (ii) a phase L′ for which two of the four cubic sublattices have the same average occupancy and each of the two others are different appears between L10 and L12; (iii) the transition L′/L12 is of first order.
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Tétot, R., Finel, A. & Ducastelle, F. Superdegenerate point in FCC phase diagram: CVM and Monte Carlo investigations. J Stat Phys 61, 121–141 (1990). https://doi.org/10.1007/BF01013956
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DOI: https://doi.org/10.1007/BF01013956