Engel, Andreas and Bartolf, Holger and Schilling, Andreas and Ilin, Konstantin and Siegel, Michael and Semenov, Alexei and Hübers, Heinz-Wilhelm (2008) Temperature- and field-dependence of critical currents in NbN microbridges. In: Journal of Physics: Conference Series, 97. IOP Publishing. 8th European Conference on Applied Sperconductivity, 2007-09-16 - 2007-09-20, Brussels (Belgium).
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We report measurements of the critical current of nano- and micrometer-sized NbN bridges as a function of temperature and magnetic eld. The bridges were fabricated from 4 to 10 nm thick, sputtered NbN lms using standard photo- and e-beam lithography. The detailed temperature- and eld-dependence is strongly influenced by the bridge width. We interpret our data taking into account geometrical edge barriers for vortex entry and conclude that submicrometer wide bridges remain free of vortices in zero-eld and measured critical currents are the depairing currents. The situation is much more complex inmicrometer-wide bridges. For certain conditions such bridges may even show non-monotonous dependence of the critical current on temperature. We develop a qualitative model that explains our main observations.
|Document Type:||Conference or Workshop Item (UNSPECIFIED)|
|Title:||Temperature- and field-dependence of critical currents in NbN microbridges|
|Journal or Publication Title:||Journal of Physics: Conference Series|
|In ISI Web of Science:||No|
|Number of Pages:||6|
|Keywords:||superconducting nanostructures, magnetic vortices|
|Event Title:||8th European Conference on Applied Sperconductivity|
|Event Location:||Brussels (Belgium)|
|Event Type:||international Conference|
|Event Dates:||2007-09-16 - 2007-09-20|
|HGF - Research field:||Aeronautics, Space and Transport (old)|
|HGF - Program:||Space (old)|
|HGF - Program Themes:||W EW - Erforschung des Weltraums|
|DLR - Research area:||Space|
|DLR - Program:||W EW - Erforschung des Weltraums|
|DLR - Research theme (Project):||W - Vorhaben IR-Astronomie (old)|
|Institutes and Institutions:||Institute of Planetary Research > Terahertz and Infrared Sensors|
|Deposited By:||Prof.Dr. Alexey Semenov|
|Deposited On:||05 Jan 2009|
|Last Modified:||17 Mar 2010 11:38|
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