Sound Velocity Anomaly at the Mott Transition: application to organic   conductors and V2O3
  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 \kappa-(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. 
S.R. Hassan (LPTENS, CPHT), A. Georges (LPTENS, CPHT), H.R.   Krishnamurthy (CCMT, Jncasr)