Physical Properties and Dimensionality of κ-(BEDT-TTF)2Cu(CN)[N(CN)2

Abstract

The electrical resistivity measurements for the novel organic superconductor κ-(BEDT-TTF) 2 Cu(CN)[N(CN) 2 ] ( T c =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 ( T c ), the depressibility of T c with pressure (- d T c / d P ), the residual resistance ratio ( R R R ), the upper critical field ( H C2 ), 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 T c above 10 K; κ-(BEDT-TTF) 2 Cu(NCS) 2 and κ -(BEDT-TTF) 2 Cu[N(CN) 2 ]Br. A simple relation was observed between these parameters ( T c , - d T c / d P and R R R ) and the dimensionality of the electronic structures of these superconductors.