Mott transition and transport crossovers in the organic compound $κ-(BEDT-TTF)_2 Cu[N(CN)_2] Cl$

Details Mott transition and transport crossovers in the organic compound $κ-(BEDT-TTF)_2 Cu[N(CN)_2] Cl$ Mott transition and transport crossovers in the organic compound $κ-(BEDT-TTF)_2 Cu[N(CN)_2] Cl$

2003-01-24

arxiv.org/abs/cond-mat/0301478v2

Phys. Rev. Lett. 91, 016401 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 6 figures

Scientific paper

10.1103/PhysRevLett.91.016401

We have performed in-plane transport measurements on the two-dimensional organic salt $\kappa$-(BEDT-TTF)$_{2}$Cu[N(CN)$_{2}$]Cl. A variable (gas) pressure technique allows for a detailed study of the changes in conductivity through the insulator-to-metal transition. We identify four different transport regimes as a function of pressure and temperature (corresponding to insulating, semi-conducting, ''bad metal'', and strongly correlated Fermi liquid behaviours). Marked hysteresis is found in the transition region, which displays complex physics that we attribute to strong spatial inhomogeneities. Away from the critical region, good agreement is found with a dynamical mean-field calculation of transport properties using the numerical renormalization group technique.

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