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Critical current of Nb and NbN thin-film structures: The cross-section dependence

Ill'in, K. and Siegel, M. and Semenov, A. and Engel, A. and Hübers, H.-W. (2005) Critical current of Nb and NbN thin-film structures: The cross-section dependence. Physica Status Solidi (c), 2 (5), pp. 1680-1687. Wiley-VCH. DOI: 10.1002/pssc.200460811

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Abstract

We present results of a systematic study of the critical current in superconducting Nb and NbN thin film bridges. The bridges with a width from 50 nm to 10 µm were patterned from thin superconducting films by means of electron-beam lithography and ion milling. For both materials the nominal critical current density extrapolated to zero temperature varied with the bridge width and thickness. We attribute these variations to a fabrication-enhanced reduction of the effective, superconducting cross-section of the bridges with respect to their geometric cross-section and to an uneven distribution of the super-current over the superconducting core of the bridge. In very thin bridges, i.e. 5 nm and 8 nm for NbN and Nb, respectively, the nominal current density increased drastically when the bridge width became smaller than 500 nm. We associate the enhancement of the critical current density in narrow bridges with the crossover from depinning of magnetic vortices to either their nucleation or breaking Cooper pairs.

Item URL in elib:https://elib.dlr.de/18848/
Document Type:Article
Additional Information: LIDO-Berichtsjahr=2005,
Title:Critical current of Nb and NbN thin-film structures: The cross-section dependence
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ill'in, K.Institute for Micro- and Nanoelectronic Systems, University of Karlsruhe, KarlsruheUNSPECIFIED
Siegel, M.Institute for Micro- and Nanoelectronic Systems, University of Karlsruhe, KarlsruheUNSPECIFIED
Semenov, A.UNSPECIFIEDUNSPECIFIED
Engel, A.Physics Institute, University of Zurich, Zurich, SwitzerlandUNSPECIFIED
Hübers, H.-W.UNSPECIFIEDUNSPECIFIED
Date:2005
Journal or Publication Title:Physica Status Solidi (c)
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Volume:2
DOI :10.1002/pssc.200460811
Page Range:pp. 1680-1687
Publisher:Wiley-VCH
Status:Published
Keywords:Supraleitung, Photonenzähler, Nb, NbN, Dünnschichtfilm
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):UNSPECIFIED
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research
Deposited By: Pieth, Susanne
Deposited On:09 Oct 2005
Last Modified:14 Jan 2010 19:51

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