Scaling theory of the Mott transition and breakdown of the Grüneisen scaling near a finite-temperature critical end point

Details Scaling theory of the Mott transition and breakdown of the Grüneisen scaling near a finite-temperature critical end point Scaling theory of the Mott transition and breakdown of the Grüneisen scaling near a finite-temperature critical end point

2010-04-27

arxiv.org/abs/1004.4898v2

Phys. Rev. Lett. 104, 245701 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

4 REVTeX pages, 4 figures; minor changes, as published

Scientific paper

10.1103/PhysRevLett.104.245701

We discuss a scaling theory of the lattice response in the vicinity of a finite-temperature critical end point. The thermal expansivity is shown to be more singular than the specific heat such that the Gr\"uneisen ratio diverges as the critical point is approached, except for its immediate vicinity. More generally, we express the thermal expansivity in terms of a scaling function which we explicitly evaluate for the two-dimensional Ising universality class. Recent thermal expansivity measurements on the layered organic conductor kappa-(BEDT-TTF)_2 X close to the Mott transition are well described by our theory.

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