On the dynamics of band Jahn-Teller systems with A15-structure

Robert Kragler

Physica A: Statistical Mechanics and its Applications, 1982, vol. 110, issue 3, 373-407

Abstract: We construct a thermodynamic model for a system of electronic d-bands coupled to the elastic lattice. For the electronic fluctuations a Debye-type of relaxation, for the lattice displacement a modified elastic equation of motion is assumed. As a result a coupling of certain acoustic and relaxational modes is found leading to a soft mode instability. For non-vanishing external fields displacement and dielectric response functions are derived. The special case for wavevector q‖[110] is worked out explicitly. A comparison between the present phenomenological model and a microscopic multiple-band electron-phonon transport theory, recently given by the author, reveals remarkable agreement between both approaches.

Date: 1982
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:110:y:1982:i:3:p:373-407

DOI: 10.1016/0378-4371(82)90059-0

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