Abstract
A cooperative electron-phonon system is considered which exhibits a triply degenerate electronic ground state in each unit cell. As a model substance a simple cubic crystal is taken where each Jahn-Teller molecule has an octahedral surrounding. TheT electronic ground state is linearly coupled toe andt type vibrations with thee coupling dominating. By a unitary transformation the electron-phonon system is approximately decoupled. The remaining cooperative electron-electron system displays transport properties which are discussed in terms of a modified Maradudin formalism. Thermal conductivity is calculated by linear response theory. It is shown that in the transformed picture the phonon heat current approximately is independent from the pseudo spin heat current and the total thermal conductivity is given as a simple superposition of both contributions.
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Wenzel, G. Transport in cooperativeT−(e+t) Jahn-Teller systems. Z Physik B 36, 133–139 (1979). https://doi.org/10.1007/BF01320214
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DOI: https://doi.org/10.1007/BF01320214