Simple CVM-based approximations for the configurational entropy

Details Simple CVM-based approximations for the configurational entropy Simple CVM-based approximations for the configurational entropy

1998-01-13

arxiv.org/abs/cond-mat/9801118v1

Physics

Condensed Matter

Statistical Mechanics

6 pages, no figures, EuroTeX, submitted to Europhysics Letters

Scientific paper

It is shown how to derive simple polynomial expressions for the variational configurational entropy starting from the cluster variation method (CVM). As an example, first six terms of the expansion of the entropy in powers of the nearest-neighbour (NN) short-range order (SRO) parameter are obtained for the NN Ising ferromagnet on the face-centered cubic lattice using the tetrahedron (T-CVM) approximation. Calculated values of the transition temperature and the NN SRO parameter at the transition converge rapidly to their T-CVM counterparts as order of the approximation increases.

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