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

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.

final version

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