|Author||Bartolf, H. ♦ Engel, A. ♦ Schilling, A. ♦ Il'in, K. ♦ Siegel, M. ♦ Huebers, H. -W ♦ Semenov, A.|
|Date of Submission||2009-11-10|
|Subject Domain (in DDC)||Computer science, information & general works ♦ Natural sciences & mathematics ♦ Physics|
|Subject Keyword||Condensed Matter - Superconductivity ♦ Condensed Matter - Mesoscale and Nanoscale Physics ♦ Physics - Instrumentation and Detectors ♦ physics:cond-mat ♦ physics:physics|
|Abstract||We present results from an extensive study of fluctuation phenomena in superconducting nanowires made from sputtered NbN. Nanoscale wires were fabricated in form of a meander and operated at a constant temperature T~0.4Tc(0). The superconducting state is driven close to the electronic phase transition by a high bias current near the critical one. Fluctuations of sufficient strength temporarily drive a section of the meander structure into the normal conducting state, which can be registered as a voltage pulse of nanosecond duration. We considered three different models (vortex-antivortex pairs, vortex edge barriers and phase slip centers) to explain the experimental data. Only thermally excited vortices, either via unbinding of vortex-antivortex pairs or vortices overcoming the edge barrier, lead to a satisfactory and consistent description for all measurements.|
|Learning Resource Type||Article|
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