A unified perspective on cuprates and layered organic superconductors

Layered organic superconductors of the BEDT family are model systems for understanding the interplay of the Mott transition with magnetic order and frustration, ingredients that are essential to understand superconductivity also in cuprate high-temperature superconductors. Cellular Dyanmical Mean-Field Theory yields a unified theoretical perspective on the corresponding phase diagrams containing superconducting, antiferromagnetic and spin-liquid phases. In particular, the superconducting dome is tied to the Mott transition and its continuation as a transition (Sordi transition) separating pseudogap phase from correlated metal in doped BEDT compounds, as in the cuprates. Contrary to heavy fermions, the maximum of the dome is not attached to an antiferromagnetic quantum critical point. The experimental superfluid stiffness shows highly non-BCS behavior that can also be explained. A few experimental predictions follow. In particular, destroying superconductivity with a magnetic field in the doped compounds should reveal the normal state transition between pseudogap and correlated metal.

Collaborators: C-D Hébert, P. Sémon, G. Sordi