Abstract

Molecule-based superconductors provide an interesting playground for exploring exotic superconductivity. I will give an overview of the properties of these organic superconductors and discuss some scaling relations which appear to exist between the superconducting transition temperature, the superfluid stiffness and the normal state conductivity. These new scaling properties hold as Tc varies over two orders of magnitude for materials with differing dimensionality and contrasting molecular structure, and are dramatically different from the equivalent scaling properties observed within the family of cuprate superconductors. I will also describe the results of some recent experiments in which defects have been introduced into clean samples of the organic superconductor kappa-(BEDT-TTF)2Cu(SCN)2 in order to determine their effect on the temperature dependence of the conductivity and the critical temperature. These results provide an important constraint on models of the superconductivity in this material.