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Suppression of superconuctivity in Nb and NbN thinfilm nano-structures

Il'in, K.S. and Siegel, M. and Semenov, A.D. and Engel, A. and Hübers, H.-W. (2004) Suppression of superconuctivity in Nb and NbN thinfilm nano-structures. In: Applied Superconductivity 2003, 181, pp. 2895-2901. Institute of Physics. 6th European conference on Applied Superconductivity, Sorrento, Italy, 14.-18.9.2003.

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Abstract

We have performed a systematic study of the superconducting properties of Nb and NbN thin-film Nano-bridges, which are readily usable as structural units of single-photon detectors. We present dependencies of the superconduction transition temperature of Nb and NbN thin-film bridges on their thickness and width, with particular emphasis on the nanometer wide structures made from ultra-thin filmes. Typically, for bridges thicker than 50 nm and wider than 1 µm, the transition temperature does not depend on the bridge dimensions. For smaller bridges, a significant reduction of the critical temperature has been found. The reduction is attribtued to the proximity effect in normal-metal-superconducting-normal-metal (NSN) structures with perfect N-S interfaces (Cooper's limit). Both the effective thickness and width of normal areas in the bridgte have been evaluated from comparison of the experimental results and theoretical simulations. We discuss arising of the normal areas in the manufacture of nano-bridges.

Item URL in elib:https://elib.dlr.de/11112/
Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=2005,
Title:Suppression of superconuctivity in Nb and NbN thinfilm nano-structures
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Il'in, K.S.Institute of Micro- and Nanoelectronic Systems, University of KarlsruheUNSPECIFIED
Siegel, M.Institute of Micro- and Nanoelectronic Systems, University of KarlsruheUNSPECIFIED
Semenov, A.D.UNSPECIFIEDUNSPECIFIED
Engel, A.UNSPECIFIEDUNSPECIFIED
Hübers, H.-W.UNSPECIFIEDUNSPECIFIED
Date:2004
Journal or Publication Title:Applied Superconductivity 2003
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:181
Page Range:pp. 2895-2901
Editors:
EditorsEmail
Andreone, A.UNSPECIFIED
Pepe, G.P.UNSPECIFIED
Christiano, R.UNSPECIFIED
Masullo, G.UNSPECIFIED
Publisher:Institute of Physics
Series Name:Institute of Physics Conference Series
Status:Published
Keywords:Supraleitung, Dünnschichtfilme, Nb, NbN, Proximity Effekt
Event Title:6th European conference on Applied Superconductivity, Sorrento, Italy, 14.-18.9.2003
Organizer:IoP
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:16 Sep 2005
Last Modified:14 Jan 2010 16:51

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