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Characteristics of superconducting tungsten silicide WxSi1-x for single photon detection

Chang, Xiaofu and Engel, Andreas and Wang, Q and Schilling, Andreas and Semenov, Alexey and Sidorova, Maria and Hübers, Heinz-Wilhelm and Charaev, Ilya and Ilin, Konstantin and Siegel, Michael (2016) Characteristics of superconducting tungsten silicide WxSi1-x for single photon detection. Physical Review B, 94 (174509). American Physical Society. DOI: 10.1103/PhysRevB.94.174509 ISSN 1098-0121

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Superconducting properties of three series of amorphous WxSi1−x films with different thickness and stoichiometry were investigated by dc transport measurements in a magnetic field up to 9 T. These amorphous WxSi1−x films were deposited by magnetron cosputtering of the elemental source targets onto silicon substrates at room temperature and patterned in the form of bridges by optical lithography and reactive ion etching. Analysis of the data on magnetoconductivity allowed us to extract the critical temperatures, superconducting coherence lengths, magnetic penetration depths, and diffusion constants of electrons in the normal state as functions of film thickness for each stoichiometry. Two basic time constants were derived from transport and time-resolving measurements. A dynamic process of the formation of a hotspot was analyzed in the framework of a diffusion-based vortex-entry model. We used a two-stage diffusion approach and defined a hotspot size by assuming that the quasiparticles and normal-state electrons have the same diffusion constant.With this definition and these measured material parameters, the hotspot in the 5-nm-thickW0.85Si0.15 film had a diameter of 107 nm at the peak of the number of nonequilibrium quasiparticles.

Item URL in elib:https://elib.dlr.de/110058/
Document Type:Article
Title:Characteristics of superconducting tungsten silicide WxSi1-x for single photon detection
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Chang, XiaofuUniversity of ZürichUNSPECIFIED
Engel, Andreasuniversity of zürichUNSPECIFIED
Wang, Quniversity of zürichUNSPECIFIED
Schilling, Andreasuniversity of zürichUNSPECIFIED
Semenov, AlexeyAlexei.Semenov (at) dlr.deUNSPECIFIED
Sidorova, MariaMariia.Sidorova (at) dlr.deUNSPECIFIED
Hübers, Heinz-WilhelmHeinz-Wilhelm.Huebers (at) dlr.deUNSPECIFIED
Charaev, Ilyauniversity of karlsruheUNSPECIFIED
Ilin, Konstantininstitute of micro- and nanosystems, university of karlsruheUNSPECIFIED
Siegel, Michaelinstitut für mikro- und nanoelektronische systeme, universität karlsruheUNSPECIFIED
Date:16 November 2016
Journal or Publication Title:Physical Review B
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
DOI :10.1103/PhysRevB.94.174509
Publisher:American Physical Society
Keywords:thin films, photon detection, transport phenomena
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Technik für Raumfahrtsysteme
DLR - Research theme (Project):R - Aufbau und Aktualisierung eines DLR-Katalogs für Raumfahrtrückstande (Space Debris)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems
Deposited By: Semenov, Prof.Dr. Alexey
Deposited On:05 Jan 2017 16:13
Last Modified:06 Sep 2019 15:29

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