Puzzling evidence for surface superconductivity in the layered dichalcogenide Cu$_{10\%}$TiSe$_2$

F. Levy-Bertrand; B. Michon; J. Marcus; C. Marcenat; J. Kačmarčík; T. Klein; H. Cercellier

doi:10.1016/j.physc.2016.02.004

Puzzling evidence for surface superconductivity in the layered dichalcogenide Cu$_{10\%}$TiSe$_2$

Superconductivity 2017-01-13 v1

Authors: F. Levy-Bertrand , B. Michon , J. Marcus , C. Marcenat , J. Kačmarčík , T. Klein , H. Cercellier

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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 $H_{c2}$ deduced from the calorimetric measurements. Surprisingly this "surface" superconductivity is present for all magnetic field orientations, either parallel or perpendicular to the layers. For $H\|ab$ , 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.

Keywords

surface superconductivity CuTiSe2 specific heat magnetotransport upper critical field Ginzburg-Landau equation

Cite

@article{arxiv.1701.03287,
  title  = {Puzzling evidence for surface superconductivity in the layered dichalcogenide Cu$_{10\%}$TiSe$_2$},
  author = {F. Levy-Bertrand and B. Michon and J. Marcus and C. Marcenat and J. Kačmarčík and T. Klein and H. Cercellier},
  journal= {arXiv preprint arXiv:1701.03287},
  year   = {2017}
}

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5 pages, 4 figures

Puzzling evidence for surface superconductivity in the layered dichalcogenide Cu$_{10\%}$TiSe$_2$

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