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

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%TiSe₂

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

École Polytechnique

Research output: Contribution to journal › Article › peer-review

Abstract

We report on specific heat and magnetotransport measurements performed on superconducting Cu_10%TiSe₂ 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.

Original language	English
Pages (from-to)	19-22
Number of pages	4
Journal	Physica C: Superconductivity and its Applications
Volume	523
DOIs	https://doi.org/10.1016/j.physc.2016.02.004
Publication status	Published - 15 Apr 2016

Keywords

Dichalcogenide
Specific heat
Surface superconductivity
Transport

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10.1016/j.physc.2016.02.004

Cite this

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title = "Puzzling evidence for surface superconductivity in the layered dichalcogenide Cu10\%TiSe2",

abstract = "We report on specific heat and magnetotransport measurements performed on superconducting Cu10\%TiSe2 single crystals. We show that superconductivity persists in transport measurements up to magnetic fields HR well above the upper critical field Hc2 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 HR/Hc2 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 = "Dichalcogenide, Specific heat, Surface superconductivity, Transport",

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T1 - Puzzling evidence for surface superconductivity in the layered dichalcogenide Cu10%TiSe2

AU - Levy-Bertrand, F.

AU - Michon, B.

AU - Marcus, J.

AU - Marcenat, C.

AU - Kačmarčík, J.

AU - Klein, T.

AU - Cercellier, H.

PY - 2016/4/15

Y1 - 2016/4/15

N2 - We report on specific heat and magnetotransport measurements performed on superconducting Cu10%TiSe2 single crystals. We show that superconductivity persists in transport measurements up to magnetic fields HR well above the upper critical field Hc2 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 HR/Hc2 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.

AB - We report on specific heat and magnetotransport measurements performed on superconducting Cu10%TiSe2 single crystals. We show that superconductivity persists in transport measurements up to magnetic fields HR well above the upper critical field Hc2 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 HR/Hc2 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.

KW - Dichalcogenide

KW - Specific heat

KW - Surface superconductivity

KW - Transport

U2 - 10.1016/j.physc.2016.02.004

DO - 10.1016/j.physc.2016.02.004

M3 - Article

AN - SCOPUS:84963604310

SN - 0921-4534

VL - 523

SP - 19

EP - 22

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications