Abstract
Ultrathin superconducting/ferromagnet (S/F) nanostripes are very interesting systems to investigate both the physics involved on nanoscale size and as light sensitive elements for superconducting single photon detectors. The electrical transport properties of NbN(8 nm)/NiCu(10 nm) nanostripes are presented down to a temperature of 4.2 K. A number of voltage steps were observed on the current-voltage characteristics, and they were investigated at different temperatures. A possible explanation in terms of active phase-slip phenomena has been proposed on the basis of the time-dependent Ginzburg-Landau theory, leading to an estimation of the inelastic electron-phonon relaxation time around 0.8 ps. The latter value was found to be in good agreement with a relaxation time, independently measured by femtosecond transient optical reflectivity experiments performed on the same bilayer.
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Parlato, L., Ejrnaes, M., Cristiano, R. et al. Phase-Slip Phenomena in Proximitized NbN/NiCu Superconducting Nanostripes. J Supercond Nov Magn 30, 3403–3407 (2017). https://doi.org/10.1007/s10948-017-4247-6
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DOI: https://doi.org/10.1007/s10948-017-4247-6