Physics – Condensed Matter – Superconductivity
Scientific paper
2009-11-10
Physical Review B, Vol 81, Issue 2, 024502, (2010), 12 Pages
Physics
Condensed Matter
Superconductivity
41 Pages, 5 Chapters, 7 Figures, 2 Tables, 30 Equations, 68 References; Selected for the January 15, 2010 Issue of the Virtual
Scientific paper
10.1103/PhysRevB.81.024502
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.
Bartolf H.
Engel Assaf
Huebers Heinz-Wilhelm
Il'in Konstantin
Schilling Anne
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