Fluctuation effects in superconducting nanostrips
A. Engel (1, 2), A.D. Semenov (2), H.-W. Huebers (2), K. Il'in (3),, M. Siegel (3) ((1) Physics Institute, University of Zurich, Switzerland, (2), DLR Institute of Planetary Research, Berlin, Germany, (3) Institute of Micro-, and Nano-Electronic Systems, University of Karlsruhe
TL;DR
This paper investigates superconducting fluctuations in ultrathin NbN nanostrips, analyzing how current and temperature influence localized transitions into the normal state, supported by models of Cooper pair fluctuations and vortex dynamics.
Contribution
It introduces models explaining fluctuation rates based on Cooper pair density variations and vortex-antivortex unbinding in superconducting nanostrips.
Findings
Fluctuations cause voltage transients near the critical current.
Models successfully explain current and temperature dependence of fluctuations.
Localized normal state transitions are observed in ultrathin NbN strips.
Abstract
Superconducting fluctuations in long and narrow strips made from ultrathin NbN films, have been investigated. For large bias currents close to the critical current fluctuations led to localized, temporary transitions into the normal conducting state, which were detected as voltage transients developing between the strip ends. We present models based on fluctuations in the Cooper pair density and current-assisted thermal-unbinding of vortex-antivortex pairs, which explain the current and temperature dependence of the experimental fluctuation rates.
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