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Article

Surface superconductivity in a three-dimensional Cd3As2 semimetal at the interface with a gold contact

Physical Review B: Condensed Matter and Materials Physics. 2020. Vol. 99. No. 12. P. 125305-1-125305-5.
O. O. Shvetsov, E. V. Deviatov.

We experimentally investigate charge transport through a single planar junction between a Cd3As2 Dirac semimetal and a normal Au lead. For nonsuperconducting bulk Cd3As2 samples we observe non-Ohmic dV/dI(V ) curves, which strongly resemble standard Andreev reflection with a well-defined superconducting gap. Andreev-like behavior is demonstrated for Cd3As2 samples with different surface and contact preparation techniques. We connect this behavior with surface superconductivity due to the flat-band formation in Cd3As2, which has been predicted theoretically. The conclusion on superconductivity is also supported by the gap suppression by magnetic fields or temperature.