Phonon anomalies due to strong electronic correlations in layered organic metals

Details Phonon anomalies due to strong electronic correlations in layered organic metals Phonon anomalies due to strong electronic correlations in layered organic metals

2000-07-11

arxiv.org/abs/cond-mat/0007173v1

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 3 eps figures

Scientific paper

10.1103/PhysRevB.62.16442

We show how the coupling between the phonons and electrons in a strongly correlated metal can result in phonon frequencies which have a non-monotonic temperature dependence. Dynamical mean-field theory is used to study the Hubbard-Holstein model that describes the \kappa-(BEDT-TTF)_2 X family of superconducting molecular crystals. The crossover with increasing temperature from a Fermi liquid to a bad metal produces phonon anomalies that are consistent with recent Raman scattering and acoustic experiments.

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