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Temperature- and field-dependence of critical currents in NbN microbridges

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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Official URL: http://www.iop.org/EJ/article/1742-6596/97/1/012152/jpconf8_97_012152.pdf?request-id=ccca31ed-6abc-476b-9c77-3d8bfb435b8a


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.

Item URL in elib:https://elib.dlr.de/56537/
Document Type:Conference or Workshop Item (UNSPECIFIED)
Additional Information:doi:10.1088/1742-6596/97/1/012152
Title:Temperature- and field-dependence of critical currents in NbN microbridges
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Engel, AndreasUniversity of ZürichUNSPECIFIED
Bartolf, HolgerUniversity of ZürichUNSPECIFIED
Schilling, AndreasUniversity of ZürichUNSPECIFIED
Ilin, KonstantinUniversity of KarlsruheUNSPECIFIED
Siegel, MichaelUniversity of KarlsruheUNSPECIFIED
Date:March 2008
Journal or Publication Title: Journal of Physics: Conference Series
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Number of Pages:6
Publisher:IOP Publishing
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)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Terahertz and Infrared Sensors
Deposited By: Semenov, Prof.Dr. Alexey
Deposited On:05 Jan 2009
Last Modified:17 Mar 2010 11:38

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