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29 March 2024
 
  » arxiv » 1811.2475

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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 ;
Date 6 Nov 2018
AbstractWe 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.
Source arXiv, 1811.2475
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