Organic charge transfer complex at the boundary between superconductors and insulators: critical role of a marginal part of the conduction pathways

Abstract

κ-ET₂Cu[N(CN)₂]I (ET = bis(ethylenedithio)tetrathiafulvalene) has previously been reported as both a superconductor and an insulator. Examination of each single crystal revealed that the electrical properties are affected by slight differences in the conformation of one of the ethylene groups of ET, which is not involved in the conduction pathways.