Sound Velocity Anomaly at the Mott Transition: Application to Organic Conductors andV2O3

2004/05/31 by S. R. Hassan, Antoine Georges, A. Georges +1
Materials Science · Physics and Astronomy · #Anomaly (physics) #Compressibility #Condensed matter physics #Conductor #Lattice (music) #Magnetism in coordination complexes #Materials science #Organic and Molecular Conductors Research #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Softening #Speed of sound #Thermodynamics #cond-mat.str-el

paper · pdf · doi:10.1103/physrevlett.94.036402

New discussion of the relation between the sound-velocity and the compressibility has been added

arxiv created 2004/10/12 · openalex publication_date 2005/01/24 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

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-conductor \ensuremathκ\mathrm\text\ensuremath-(BEDT\mathrm\text\ensuremath-TTF)₂Cu[N(CN)₂]Cl. We predict that effects of a similar magnitude are expected for V₂O₃, despite the much larger value of the elastic modulus of this material.

Citations

• The Mott transition: Unconventional transport, spectral weight transfers, and critical behaviour
• Transport criticality of the first-order Mott transition in the quasi-two-dimensional organic conductorκ−(BEDT−TTF)2Cu[N(CN)2]Cl
• Mott Transition and Transport Crossovers in the Organic Compoundκ−(BEDT−TTF)2Cu[N(CN)2]Cl
• Universality and Critical Behavior at the Mott Transition
• Mott Transition, Compressibility Divergence, and theP−TPhase Diagram of Layered Organic Superconductors: An Ultrasonic Investigation