Abstract

In this present work, Cesium Dihydrogen Arsenate of ordered dis-ordered type H-bonded crystal is theoretically investigated. Presently modified Pseudo Spin Lattice Coupled Mode (PLCM) model by adding some extra terms, like direct spin–spin terms, third-order and fourth-order phonon anharmonic terms, and extra spin–lattice terms. By using the Green function approach and Dyson’s equation, formulae for various quantities are find out. Thermal variations of Cochran’s mode frequency, electrical permittivity, phase transition, tangent delta, shift, and width are obtained for Cesium Dihydrogen Arsenate crystal. A comparison with theoretical findings has been made with the experimental finding reported by Blinc et al. [8]. A good agreement is seen.

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