Deformable shell-model calculation of the lattice statics and dynamics of the CsBr crystal

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Abstract
In this report we present a simple statistical-model derivation of the three-body interaction envisaged in the deformable-shell model developed by Basu and Sengupta. Next the model is applied to a unified study of the lattice statics and dynamics of the CsBr crystal, the same set of parameters being used throughout. Among the alkali halide crystals, the cesium group of halides are distinguished from the rest by two characteristic problems of the their own—one related to the stability of the static lattice structure and the other concerning the correlation of the dielectric properties and the dispersion of phonons. The results of the present calculation show that this simple model gives a good description of the lattice mechanics of the CsBr crystal in all its totality and the source of improvement for the remaining discrepancy is suggested.

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