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Article Dans Une Revue Physica C: Superconductivity and its Applications Année : 2016

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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Dates et versions

hal-01327122 , version 1 (06-06-2016)

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F. Levy-Bertrand, B. Michon, J. Marcus, C. Marcenat, J. Kačmarčík, et al.. Puzzling evidence for surface superconductivity in the layered dichalcogenide Cu10%TiSe2. Physica C: Superconductivity and its Applications, 2016, 523, pp.19-22. ⟨10.1016/j.physc.2016.02.004⟩. ⟨hal-01327122⟩
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