Phonon anomalies due to strong electronic correlations in layered organic metals

J. Merino; Ross H. McKenzie (University of New South Wales)

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Phonon anomalies due to strong electronic correlations in layered organic metals

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arxiv cond-mat/0007173 v1 pith:JLX375KM submitted 2000-07-11 cond-mat.str-el

Phonon anomalies due to strong electronic correlations in layered organic metals

J. Merino , Ross H. McKenzie (University of New South Wales) This is my paper

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keywords phononanomaliesmetaltemperatureacousticbedt-ttfconsistentcorrelated

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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.

Phonon anomalies due to strong electronic correlations in layered organic metals

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