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Dissipative Fluctuation Mechanisms in Superconductors

Bartolf, H. and Inderbitzin, K. and Engel, A. and Schilling, A. and Il‘in, K. and Siegel, M. and Semenov, A. D. and Hübers, H.-W. (2010) Dissipative Fluctuation Mechanisms in Superconductors. In: Tagungsband, p. 35. DLR. Kryo 2010, 03.-05.10.2010, Zeuthen, Brandenburg.

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Abstract

In the Shubnikov-Phase of a type-II superconductor, the electronic system of the bulk sample is perforated by circulating supercurrents, the well-known vortices that generate the penetrating magnetic flux quanta 0  . In a macroscopic superconductor the self-energy of such a vortex is relatively high, so that the application of an external magnetic field is necessary for the generation of the vortices. This situation changes entirely if the sample’s spatial dimensions are shrunk into the nanoscale (Fig. 1). Now thermal fluctuations with an energetic strength on the order of k T B are able to excite single-vortices in zero-magnetic field inside the superconductor (see, e.g. the famous BKT transition [1], where vortex pairs are excited). For applications of superconductivity these thermally excited vortices are troublesome because they interact electromagnetically with the bias current b I driven through the operational device. The resulting Lorentz-force leads to a dissipative vortex-motion which causes unwanted electronic noise. Therefore we focus on the fundamental quantitative understanding of these mechanisms to develop approaches that might reduce fluctuating vortices. Our aim is to enhance the performance of superconducting devices in general.

Document Type:Conference or Workshop Item (Speech)
Title:Dissipative Fluctuation Mechanisms in Superconductors
Authors:
AuthorsInstitution or Email of Authors
Bartolf, H.Physics Institute, University of Zürich, Winterthurerstraße 190, 8057 Zürich, Switzerland
Inderbitzin, K.Physics Institute, University of Zürich, Winterthurerstraße 190, 8057 Zürich, Switzerland
Engel, A.Physics Institute, University of Zürich, Winterthurerstraße 190, 8057 Zürich, Switzerland
Schilling, A.Physics Institute, University of Zürich, Winterthurerstraße 190, 8057 Zürich, Switzerland
Il‘in, K.Institute for Micro- and Nano-Electronic Systems, University of Karlsruhe, Hertzstr. 16, 76187 Karlsruhe, Germany
Siegel, M.Institute for Micro- and Nano-Electronic Systems, University of Karlsruhe, Hertzstr. 16, 76187 Karlsruhe, Germany
Semenov, A. D.Alexei.Semenov@dlr.de
Hübers, H.-W.Heinz-Wilhelm.Huebers@dlr.de
Date:October 2010
Journal or Publication Title:Tagungsband
Page Range:p. 35
Publisher:DLR
Status:Published
Keywords:Dissipative Fluctuation Mechanisms in Superconductors, Shubnikov-Phase,type-II superconductor, bulk sample, circulating supercurrents, magnetic flux, macroscopic, self-energy, of such a vortex is relatively high, zero-magnetic field
Event Title:Kryo 2010
Event Location:Zeuthen, Brandenburg
Event Type:national Conference
Event Dates:03.-05.10.2010
Organizer:DLR, Prof. Hübers
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Transport
HGF - Program Themes:Traffic Management
DLR - Research area:Transport
DLR - Program:V VM - Verkehrsmanagement
DLR - Research theme (Project):V - FAMOUS (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Terahertz and Infrared Sensors
Deposited By: Ulrike Stiebeler
Deposited On:04 Jan 2011 17:23
Last Modified:04 Jan 2011 17:23

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