Study of the anharmonic properties of copper halides

Summary We have investigated the anharmonic properties of cooper halides by means of a three-body interaction potential extended to include the van der Waals effects. For this purpose, we have computed the thirdorder elastic constants and the pressure derivatives of second-order elastic constants after deriving their correct expressions from the present potential following the lines of Sharma and Verma. Our results have, generally, followed a systematic trend and given a satisfactory prediction of the available experimental data on the anharmonic properties of copper halides. This potential has as scope of its application to describe the dynamical and dielectric properties of these halides. To speed up publication, the authors of this paper have agreed to not receive the proofs for correction.