Abstract
We have measured the pressure effects on the superconducting transition temperature (T c) of Sm 2−xCe xCuO 4−y for various x and y which show an asymmetrical behavior contrasting with what is observed in La 2−xSr xCuO 4 compounds. Previous data under hydrostatic pressure up to 20 kbar on the Ln 1.85M 0.15CuO 4−y compounds are surveyed and the results of new resistivity measurements under quasihydrostatic pressure up to 100 kbar are given. Unlike the hole-doped high T c superconductors, the quantity dLogT c dLogV was found to be weakly positive in the whole range of pressure. A simple chemical pressure analysis based on the dependence of T c on the cell volume (derived from X-ray data) in the series of rare-earths, is not consistent with the pressure effects. The data are discussed in terms of interaction between magnetism and superconductivity.
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