Puzzling evidence for surface superconductivity in the layered dichalcogenide Cu10 % TiSe2
Résumé
We report on specific heat and magnetotransport measurements performed on superconducting Cu 10% TiSe 2 single crystals. We show that superconductivity persists in transport measurements up to magnetic fields H R well above the upper critical field H c2 deduced from the calorimetric measurements. Surprisingly this " surface " superconductivity is present for all magnetic field orientations, either parallel or perpendicular to the layers. For Hab, the temperature dependence of the H R /H c2 ratio can be well reproduced by solving the Ginzburg-Landau equations in presence of a surface layer with reduced superconducting properties. Unexpectedly this temperature dependence does not depend on the field orientation.
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