Abstract

Electrical resistivity and magnetization measurements reveal that κ-(BEDT-TTF) 2Cu[N(CN) 2]Cl exhibits reentrant superconductivity (reported here for the first time for an organic solid) in a wide pressure region. The behavior based on the subtle balance between superconductivity and resistive (magnetic) phase is affected dramatically by thermal history. The low temperature state below 300 bar is of inhomogeneous mixture of superconductive and non-metallic phases, while the phase in higher pressure region can be single: rich variety of phase are found in pressure phase diagram.

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