Strong anisotropic superconducting behavior in the dichalcogenide SnSe2 intercalated with cobaltocene

We present a detailed study of the layered dichalcogenide SnSe2 intercalated with the organometallic donor molecule cobaltocene, which exhibits a superconducting transition at Tc=6 K. The extremely anisotropic superconducting behavior is reflected by an in-plane and off-plane resistivity, which deviate from each other by a factor of 200 just before superconductivity sets in. Furthermore, this strong anisotropy leads to two different superconducting transition temperatures, one goes in line with the in-plane and the other with the off-plane superconductivity. In addition, specific heat studies clearly characterize the intercalated SnSe2 as a bulk superconductor with these two different Tc's. (orig.)