Impurity Effect on Superconducting Properties in Molecular Substituted Organic Superconductor κ-(ET)2Cu(NCS)2

Abstract

We report an impurity effect in the organic superconductor κ-(ET) 2 Cu(NCS) 2 by substitution of the ET molecule with an analogue, bis(methylenedithio)tetrathiafulvalene (MT). The superconducting transition temperature decreases with increasing substitution. The in-plane magnetic penetration depth is enhanced with substitution, which is quantitatively attributed to the decrease in the in-plane mean free path. The enhancement of the penetration depth can also explain the reduction of the effective pinning in terms of the condensation energy.