Competition between insulating and superconducting states in k -(BEDT-TTF) 2 CuN(CN) 2 CL: pressure effect

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Abstract
The pressure effect on the resistance behavior of the organic superconductor κ-(BEDT-TTF)2CuN(CN)2Cl is studied. At ambient pressure it has an insulating ground state, however at a modest pressure of 150 bar superconductivity with Tc near 12 K appears and coexists with high-temperature semiconducting regime in pressure range up to 340 bar, where the later is fully suppressed and superconducting transition temperature reaches the maximum value (midpoint 12.7 K, onset 13.4 K). Under further pressure increasing Tc strongly decreases. The details of the resistance behavior at different pressures and the relation between superconducting and insulating states are discussed
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