Superconductivity of Layered Organic Compound β-(BDA-TTP)₂SbF₆, Where BDA-TTP is 2,5-Bis(1,3-dithian-2-ylidene)-1,3,4,6-tetrathiapentalene

Abstract

The superconductivity (SC) of a layered organic salt β-(BDA-TTP)₂SbF₆ with a new donor molecule centered with tetrathiapentalene (TTP) has been characterized by the temperature dependence of the upper critical field H_c2(T) and the specific heat. The SC transition behaviors observed via the resistive and magnetic susceptibility measurements are different at finite temperatures, probably due to the influence of vortex dynamics. The SC parameters including the coherence lengths are evaluated based on the H_c2(0)'s in the magnetic fields applied parallel and perpendicular to the SC plane, in combination with the specific heat data.