Current Assisted, Thermally Activated Flux Liberation in Ultrathin Nanopatterned NbN Superconducting Meander Structures - Condensed Matter > SuperconductivityReportar como inadecuado




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Abstract: We present results from an extensive study of fluctuation phenomena insuperconducting nanowires made from sputtered NbN. Nanoscale wires werefabricated in form of a meander and operated at a constant temperatureT~0.4Tc0. The superconducting state is driven close to the electronic phasetransition by a high bias current near the critical one. Fluctuations ofsufficient strength temporarily drive a section of the meander structure intothe normal conducting state, which can be registered as a voltage pulse ofnanosecond duration. We considered three different models vortex-antivortexpairs, vortex edge barriers and phase slip centers to explain the experimentaldata. Only thermally excited vortices, either via unbinding ofvortex-antivortex pairs or vortices overcoming the edge barrier, lead to asatisfactory and consistent description for all measurements.



Autor: H. Bartolf, A. Engel, A. Schilling, K. Il'in, M. Siegel, H.-W. Huebers, A. Semenov

Fuente: https://arxiv.org/



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