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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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 , 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|
|Journal or Publication Title:||Tagungsband|
|Page Range:||p. 35|
|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|
|Organizer:||DLR, Prof. Hübers|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Transport|
|HGF - Program Themes:||V VM - Verkehrsmanagement|
|DLR - Research area:||Transport|
|DLR - Program:||V VM - Verkehrsmanagement|
|DLR - Research theme (Project):||V - FAMOUS (old)|
|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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