Pressure-temperature phase diagram of the organic superconductor κ-(BEDT-TTF)2Cu[N(CN)2]I -: art. no. 064516

The pressure-temperature phase diagram of the organic superconductor kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]I determined by resistive measurements is presented. Under a hydrostatic pressure of about 1 kbar an insulating state is transformed into a metallic state, showing superconductivity with a transition temperature T-c up to 8 K, A resistivity maximum develops in the boundary region of insulator-metal trans formation and its position gradually shifts to high temperatures with pressure. These properties of the salt are in line with the generic phase diagram for kappa-phase materials, although the salt is located deep in the insulating domain of the phase diagram, contrary to the expectation based on the ionic radius of the halogen atom, We shove the relation of the shape of the phase diagram to the degree of structural order in the material.