Bi2Se3 is one of a handful of known topological insulators. Here we show that copper intercalation in the van der Waals gaps between the Bi2Se3 layers, yielding an electron concentration of similar to 2 x 10(20) cm(-3), results in superconductivity at 3.8 K in CuxBi2Se3 for 0.12@en

The structural misfit compound (PbSe)(1.16) (TiSe2)(2) is reported. It is a superconductor with a T-c of 2.3 K. (PbSe)(1.16) (TiSe2)(2) derives from a parent compound, TiSe2, which shows a charge-density wave transition and no superconductivity. The crystal structure, characterized by high-resolution electron microscopy and powder x-ray diffraction, consists of two layers of 1T-TiSe2 alternating with a double layer of (100) PbSe. Transport measurements suggest that the superconductivity is induced by charge transfer from the PbSe layers to the TiSe2 layers.@en