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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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.
|Title:||Current-assisted thermally activated flux liberation in ultrathin nanopatterned NbN superconducting meander structures|
|Journal or Publication Title:||Physical Review B|
|In ISI Web of Science:||Yes|
|Keywords:||superconducting nanowiers, magnetic vortices, fluctuations|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|HGF - Program Themes:||W - no assignement|
|DLR - Research area:||Space|
|DLR - Program:||W - no assignement|
|DLR - Research theme (Project):||W -- no assignement (old)|
|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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