paper

Puzzling evidence for surface superconductivity in the layered dichalcogenide Cu $_{10%}$ TiSe $_{2}$

arXiv:1701.03287 · doi:10.1016/j.physc.2016.02.004

Abstract

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 $H_{c 2}$ deduced from the calorimetric measurements. Surprisingly this "surface" superconductivity is present for all magnetic field orientations, either parallel or perpendicular to the layers. For $H ∥ ab$ , the temperature dependence of the $H_{R} / H_{c 2}$ 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.

5 pages, 4 figures

Puzzling evidence for surface superconductivity in the layered dichalcogenide Cu10%​TiSe2​

Abstract

Puzzling evidence for surface superconductivity in the layered dichalcogenide Cu $_{10%}$ TiSe $_{2}$