Abstract
The electrical resistivity measurements for the novel organic superconductor κ-(BEDT–TTF)2Cu(CN)[N(CN)2] (Tc=11.2 K) [BEDT–TTF represents bis (ethylenedithiolo)tetrathiafulvalene] under pressure or in high magnetic field were studied. Several physical parameters, such as the superconducting transition temperature (Tc), the depressibility of Tc with pressure (−dTc⁄dP), the residual resistance ratio (RRR), the upper critical field (HC2), and the effective Ginzburg-Landau mass anisotropy between perpendicular and parallel to the conducting plane (m⁄⁄⁄m⊥), are determined. They are discussed in comparison with those of other κ-type organic superconductors with Tc above 10 K; κ-(BEDT–TTF)2Cu(NCS)2 and κ-(BEDT–TTF)2Cu[N(CN)2]Br. A simple relation was observed between these parameters (Tc, −dTc⁄dP and RRR) and the dimensionality of the electronic structures of these superconductors.
