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Current Assisted, Thermally Activated Flux Liberation in Ultrathin Nanopatterned NbN Superconducting Meander Structures | | H. Bartolf
; A. Engel
; A. Schilling
; K. Il'in
; M. Siegel
; H.-W. Huebers
; A. Semenov
; | | Date: |
10 Nov 2009 | | 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. | | Source: | arXiv, 0911.1880 | | Services: | Forum | Review | PDF | Favorites | |
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