Approaching depairing current in dirty thin superconducting strip covered by low resistive normal metal

We experimentally demonstrate that a thin dirty superconducting (S) strip covered by low resistive normal metal (N) approaches closer to the depairing current than a single S strip, which makes its non-linear properties stronger. The obtained result comes from proximity-induced superconductivity in...

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Bibliographic Details
Published in:Superconductor science & technology 2021-01, Vol.34 (1), p.15004
Main Authors: Ustavschikov, S S, Levichev, M Yu, Pashenkin, I Yu, Klushin, A M, Vodolazov, D Yu
Format: Article
Language:English
Subjects:
depairing current
non-linear kinetic inductance
superconductor/normal metal bilayer
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Summary:We experimentally demonstrate that a thin dirty superconducting (S) strip covered by low resistive normal metal (N) approaches closer to the depairing current than a single S strip, which makes its non-linear properties stronger. The obtained result comes from proximity-induced superconductivity in the N layer, its large contribution to the superconducting properties of the SN bilayer and larger sensitivity to the current than that of the host S layer. We argue that such an SN bilayer could be a promising system for different applications based on the current-dependent kinetic inductance. In addition, we also find that in the presence of the N layer the maximal vortex velocity in the resistive state considerably increases.
ISSN:0953-2048
1361-6668
DOI:10.1088/1361-6668/abc2ad