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 framewo...

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Bibliographic Details
Published in:Physical review letters 2005-01, Vol.94 (3), p.036402.1-036402.4
Main Authors: HASSAN, S. R, GEORGES, A, KRISHNAMURTHY, H. R
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electron states
Exact sciences and technology
Metal-insulator transitions and other electronic transitions
Physics
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Summary: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 kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Cl. We predict that effects of a similar magnitude are expected for V(2)O(3), despite the much larger value of the elastic modulus of this material.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.94.036402