Abstract

An Ising model with competing interactions isotropic with respect to the cubic axes is presented as a model for binary alloys exhibiting modulated structural order. In the mean-field approximation the model supports incommensurate and commensurate structures with modulation in one, two, and three lattice directions. The behavior of the model near a ``superdegenerate'' point, where the zero-temperature entropy per spin is nonvanishing, is discussed, and low-temperature series are employed to distinguish between modulated phases which have the same mean-field free energy.

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