Surface superconductivity in a three-dimensional Cd$_3$As$_2$ semimetal

O. O. Shvetsov; V. D. Esin; A. V. Timonina; N. N. Kolesnikov; E. V. Deviatov

doi:10.1103/PhysRevB.99.125305

Surface superconductivity in a three-dimensional Cd$_3$As$_2$ semimetal

Mesoscale and Nanoscale Physics 2019-04-02 v2 Superconductivity

Authors: O. O. Shvetsov , V. D. Esin , A. V. Timonina , N. N. Kolesnikov , E. V. Deviatov

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Abstract

We experimentally investigate charge transport through a single planar junction between Cd $_3$ As $_2$ Dirac semimetal and a normal Au lead. For non-superconducting bulk Cd $_3$ As $_2$ samples, we observe non-Ohmic $dV/dI(V)$ curves, which strongly resemble standard Andreev reflection with well-defined superconducting gap. Andreev-like behavior is demonstrated for Cd $_3$ As $_2$ samples with different surface and contact preparation techniques. We connect this behavior with surface superconductivity due to the flat-band formation in Cd $_3$ As $_2$ , which has been predicted theoretically. The conclusion on superconductivity is also supported by the gap suppression by magnetic fields or temperature.

Keywords

andreev reflection superconductivity dirac cones and topological phases

Cite

@article{arxiv.1811.02475,
  title  = {Surface superconductivity in a three-dimensional Cd$_3$As$_2$ semimetal},
  author = {O. O. Shvetsov and V. D. Esin and A. V. Timonina and N. N. Kolesnikov and E. V. Deviatov},
  journal= {arXiv preprint arXiv:1811.02475},
  year   = {2019}
}

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Surface superconductivity in a three-dimensional Cd$_3$As$_2$ semimetal

Abstract

Keywords

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