Abstract
Evidence for superconductivity in (BEDT-TTF) 4 (ReO 4) 2 [where BEDT-TTF is bis(eth-ylenedithiolo)tetrathiafulvalenel near 2 K for pressures above 4 kbar is reported. This is the first unambiguous observation of superconductivity in a sulphur-donor organic system. At higher pressures the transition temperature decreases rapidly, dT c,/dP~- 0.3 K/kbar. At low pressures this material exhibits a first-order metal-insulator transition, postulated to result from a change in the arrangement of the anions which are ordered at room temperature.
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