Abstract
Superconductivity is discovered in new type of two-dimensional organic metal κ-(BEDSe-TTF) 2CuN(CN) 2Br consisting of BEDT-TTF donor analogue having selenium-substituted six-member outer rings. This salt is isostructural to the corresponding BEDT-TTF salt and shows metallic behavior accompanied with a spin-density-wave transition at T MI∼25 K. The application of pressure up to 0.15 GPa generates superconducting state at T c=7.5 K, which is lower than T c of the BEDT-TTF salt ( T c=11.6 K). The lowering of T c and the modification in the electronic structure are explained in terms of the important contribution of selenium electrons and the concomitant enhancement in donor dimerization.
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