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

Autor:	Shvetsov, O. O., Esin, V. D., Timonina, A. V., Kolesnikov, N. N., Deviatov, E. V.
Rok vydání:	2018
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter - Superconductivity
Zdroj:	Phys. Rev. B 99, 125305 (2019)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevB.99.125305
Popis:	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. Comment: final version
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1811.02475 Zobrazit plný text záznamu View this record from Arxiv