Resistance of superconducting nanowires connected to normal metal leads
G.R. Boogaard, A.H. Verbruggen, W. Belzig, and T.M. Klapwijk
TL;DR
This paper investigates the persistent resistance in superconducting nanowires connected to normal metal leads at low temperatures, revealing an intrinsic boundary resistance caused by Andreev reflection, supported by kinetic equation analysis.
Contribution
It provides experimental evidence and theoretical analysis of boundary resistance in superconducting nanowires due to Andreev processes, a novel insight into nanowire-superconductor interfaces.
Findings
Significant residual resistance observed at low temperatures
Boundary resistance attributed to Andreev conversion
Kinetic equations successfully model the phenomena
Abstract
We study experimentally the low temperature resistance of superconducting nanowires connected to normal metal reservoirs. We find that a substantial fraction of the nanowires is resistive, down to the lowest temperature measured, indicative of an intrinsic boundary resistance due to the Andreev-conversion of normal current to supercurrent. The results are successfully analyzed in terms of the kinetic equations for diffusive superconductors.
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