Phonon anomalies due to strong electronic correlations in layered organic metals

Abstract

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 κ-(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.

arXiv comment6 pages, 3 eps figures

References in corpus (5)

• Superconductivity in Fullerides
• Anomalous Normal-State Properties of High-T${}_c$ Superconductors -- Intrinsic Properties of Strongly Correlated Electron Systems?
• Transport properties of strongly correlated metals:a dynamical mean-field approach
• Cyclotron effective masses in layered metals
• Elastic Study of Antiferromagnetic Fluctuations in the Layered Organic Superconductors kappa-(BEDT-TTF)_2X

Cited by in corpus (15)

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• Strong electronic correlations in superconducting organic charge transfer salts
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• Bandwidth-controlled Mott transition in $\kappa -(BEDT-TTF{)}_{2}Cu[N(CN{)}_2]B{r}_{x}C{l}_{1-x}$ I. Optical studies of localized charge excitations
• Mott Transition, Compressibility Divergence and P-T Phase Diagram of Layered Organic Superconductors: An Ultrasonic Investigation
• Bandwidth-controlled Mott transition in kappa-(BEDT-TTF)2Cu[N(CN)2]Br{x}Cl{1-x}: Optical studies of correlated carriers
• Anomalous Lattice Response at the Mott Transition in a Quasi-2D Organic Conductor
• Sound Velocity Anomaly at the Mott Transition: application to organic conductors and V2O3
• Pseudogap and singlet formation in cuprate and organic superconductors
• Spin Fluctuations and the Pseudogap in Organic Superconductors
• Probing the Mott Physics in $\kappa$-(BEDT-TTF)${}_2$X Salts via Thermal Expansion
• Low quasiparticle coherence temperature in the one band-Hubbard model: A slave-boson approach
• Lattice softening effects at the Mott critical point of Cr-doped V${}_2$O${}_3$
• Possible observation of the signature of the bad metal phase and its crossover to a Fermi liquid in K(BEDT-TTF)2Cu(NCS)2 bulk and nanoparticles by Raman scattering