Josephson supercurrent in Nb/InN-nanowire/Nb junctions
R. Frielinghaus, I. E. Batov, M. Weides, H. Kohlstedt, R. Calarco, Th., Schaepers
TL;DR
This study demonstrates significant Josephson supercurrent in Nb/InN-nanowire/Nb junctions, showing high critical currents and magnetic field effects, advancing understanding of superconductor-nanowire interfaces.
Contribution
It provides experimental evidence of large critical currents and magnetic field effects in Nb/InN-nanowire/Nb junctions, highlighting the nanowire's good coupling to superconductors.
Findings
Critical currents up to 5.7 μA achieved.
Magnetic field causes monotonic decrease in critical current.
Magnetic pair-breaking effect explains the critical current behavior.
Abstract
We experimentally studied the Josephson supercurrent in Nb/InN-nanowire/Nb junctions. Large critical currents up to 5.7 A have been achieved, which proves the good coupling of the nanowire to the superconductor. The effect of a magnetic field perpendicular to the plane of the Josephson junction on the critical current has been studied. The observed monotonous decrease of the critical current with magnetic field is explained by the magnetic pair-breaking effect in planar Josephson junctions of ultra-narrow width [J. C. Cuevas and F. S. Bergeret, Phys. Rev. Lett. 99, 217002 (2007)]
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