Surface superconductivity in a three-dimensional Cd3As2 semimetal at the interface with a gold contact
O. O. Shvetsov, V. D. Esin, A. V. Timonina, N. N. Kolesnikov, E. V. Deviatov
DOI 10.1103/PhysRevB.99.125305 · Physical Review B
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Abstract
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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Cd3As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1 | Pressure not reported | onset |
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