Nonequilibrium phenomena in planar Josephson SNS nanostructures, where the superconductor (S) is Nb and the normal metal (N) is Cu or Au, have been studied experimentally. Using additional N electrodes attached to the S banks of the Josephson SNS junction, transport measurements have been performed at low temperatures with the injection of quasiparticles with the use of local and nonlocal connection schemes. The charge-imbalance relaxation length in niobium at temperatures much lower than the superconducting transition temperature has been determined experimentally for the first time.
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This work was supported by the Russian Science Foundation (project no. 22-12-00342) in part concerning the fabrication of nanostructures and low-temperature measurements.
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Lakunov, I.S., Egorov, S.V., Mukhanova, E.D. et al. Nonequilibrium Phenomena in Planar Mesoscopic Josephson SNS Structures Based on Superconducting Nb. Jetp Lett. 118, 644–650 (2023). https://doi.org/10.1134/S0021364023602981
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DOI: https://doi.org/10.1134/S0021364023602981