Collective excitations in the anharmonic crystal

A Verbeure and V.a Zagrebnov

Physica A: Statistical Mechanics and its Applications, 1995, vol. 215, issue 3, 394-404

Abstract: We consider a lattice model of an anharmonic crystal and compute the isothermal (χT) and adiabatics (χS) susceptibilities for the lattice displacement below Tc. A detailed analysis is given in terms of the dimension of the lattice and a decay parameter of the harmonic force. It turns out that there is a phase-space region for which 0 < χT/χS < 1, indicating breaking of ergodicity, and a region for which χT is finite, indicating the presence of a plasmon frequency due to the anharmonicity.

Date: 1995
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:215:y:1995:i:3:p:394-404

DOI: 10.1016/0378-4371(94)00260-Z

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