Revealing Intrinsic Superconductivity of the Nb/BiSbTe 2 Se Interface

Abstract Typically, topological superconductivity is reachable via proximity effect by a direct deposition of superconductor (S) on top of a topological insulator (TI) surface. Here, the double critical current in the Josephson junctions based on the topological insulator is observed in the fabricat...

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Published inAdvanced functional materials Vol. 32; no. 49
Main Authors Kudriashov, Andrei, Babich, Ian, Hovhannisyan, Razmik A., Shishkin, Andrey G., Kozlov, Sergei N., Fedorov, Alexander, Vyalikh, Denis V., Khestanova, Ekaterina, Kupriyanov, Mikhail Yu, Stolyarov, Vasily S.
Format Journal Article
LanguageEnglish
Published 01.12.2022
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Summary:Abstract Typically, topological superconductivity is reachable via proximity effect by a direct deposition of superconductor (S) on top of a topological insulator (TI) surface. Here, the double critical current in the Josephson junctions based on the topological insulator is observed in the fabricated planar Superconducting Quantum Interference Devicea. By measuring critical currents as a function of temperature and magnetic field, it is shown that the second critical current stems from the intrinsic superconductivity of the S–TI interface, which is supported by the modified Resistively Shunted Junction model and Transmission Electron Microscopy studies. This complex structure of the interface should be taken into account when the technological process involves Ar‐plasma cleaning.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.202209853