Sound Velocity Anomaly at the Mott Transition: application to organic conductors and V2O3
S. R. Hassan, A. Georges, H. R. Krishnamurthy
Abstract
Close to the Mott transition, lattice degrees of freedom react to the softening of electron degrees of freedom. This results in a change of lattice spacing, a diverging compressibility and a critical anomaly of the sound velocity. These effects are investigated within a simple model, in the framework of dynamical mean-field theory. The results compare favorably to recent experiments on the layered organic κ-(BEDT-TTF)2Cu[N(CN)2]Cl conductor . We predict that effects of a similar magnitude are expected for V2O3, despite the much larger value of the elastic modulus of this material.
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