Superconductivity in a layered organic compound, $\alpha$-${\mathrm{}(\mathrm{B}\mathrm{E}\mathrm{D}\mathrm{T}-\mathrm{T}\mathrm{T}\mathrm{F})\mathrm{}}_2$N${\mathrm{H}}_4$Hg${\mathrm{}\left(\mathrm{SCN}\right)\mathrm{}}_4$, has been characterized by measurements of the in-plane and out-of-plane resistivities and susceptibilities. The anisotropy of the normal state resistivity amounts to ${10}^5$-${10}^6$. The profiles of the in-plane and out-of-plane superconducting transitions are qualitatively different in both resistive and inductive measurements. The out-of-plane penetration depth is as long as 1.4 mm. All these results indicate that this material is a model system of Josephson-coupled two-dimensional layers with a high superconductive anisotropy,

• Received 3 January 1996

DOI:https://doi.org/10.1103/PhysRevB.53.R8879