Effects of randomness on the critical temperature in quasi-two-dimensional organic superconductors

Abstract

The effects of nonmagnetic disorder on the critical temperature ${T}_{c}$ of organic weak-linked layered superconductors with singlet in-plane pairing are considered. A randomness in the interlayer Josephson coupling is shown to destroy phase coherence between the layers, and ${T}_{c}$ suppresses smoothly in a large extent of the disorder strength. Nevertheless, the disorder of arbitrarily high strength cannot destroy completely the superconducting phase. The obtained quasilinear decrease of the critical temperature with increasing disorder strength is in good agreement with experimental measurements.