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Current-assisted thermally activated flux liberation in ultrathin nanopatterned NbN superconducting meander structures

Bartolf, Holger and Engel, Andreas and Schilling, Andreas and Ilin, Konstantin and Siegel, Michael and Hübers, H.-W. and Semenov, A. (2010) Current-assisted thermally activated flux liberation in ultrathin nanopatterned NbN superconducting meander structures. Physical Review B, 81 (024502). DOI: 10.1103/PhysRevB.81.024502.

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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 T0.4Tc0. 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.

Document Type:Article
Title:Current-assisted thermally activated flux liberation in ultrathin nanopatterned NbN superconducting meander structures
Authors:
AuthorsInstitution or Email of Authors
Bartolf, HolgerUniversity of Zürich
Engel, AndreasUniversity of Zürich
Schilling, AndreasUniversity of Zürich
Ilin, KonstantinUniversity of Karlsruhe
Siegel, MichaelUniversität Karlsruhe
Hübers, H.-W.heinz-wilhelm.huebers@dlr.de
Semenov, A.alexei.semenov@dlr.de
Date:2010
Journal or Publication Title:Physical Review B
Refereed publication:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:81
DOI:10.1103/PhysRevB.81.024502
Status:Published
Keywords:superconducting nanowiers, magnetic vortices, fluctuations
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W - no assignement
DLR - Research area:Space
DLR - Program:W - no assignement
DLR - Research theme (Project):W -- no assignement (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Terahertz and Infrared Sensors
Deposited By: Prof.Dr. Alexey Semenov
Deposited On:10 Jan 2011 09:42
Last Modified:07 Feb 2013 20:16

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