Superconductivity of TaS2-xSexlayer compounds at high pressure

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Abstract
The superconducting transition temperatures for layer compounds in the system TaS2-xSex have been measured as a function of hydrostatic pressure up to 25 kbar. When the coordination of the metal atoms is purely trigonal prismatic, Tc is strongly enhanced by pressure, whereas for mixed octahedral-trigonal prismatic coordination the increase of Tc is very much smaller. Increasing the interlayer spacing by intercalation reduces the influence of pressure upon Tc such that for expansions >or=6 AA Tc is essentially independent of pressure. It is suggested that an increase in the overlap of the dz2 wavefunctions in the interlayer region is responsible for the increase of Tc.