Volume 58, Number 1, April 2002
|Page(s)||112 - 118|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 August 2002|
Dynamic creation and annihilation of metastable vortex phase as a source of excess noise
Weizmann Institute of Science, Department of
Condensed Matter Physics Rehovot 76100, Israel
2 Ben Gurion University of the Negev, Department of Physics Beer Sheva 84105, Israel
3 NEC Research Institute - 4 Independence Way, Princeton, NJ 08540, USA
4 Tata Institute of Fundamental Research - Mumbai 400005, India
Accepted: 11 January 2002
The large increase in voltage noise, commonly observed in the vicinity of the peak-effect in superconductors, is ascribed to a novel noise mechanism. A strongly pinned metastable disordered vortex phase, which is randomly generated at the edges and annealed into ordered phase in the bulk, causes large fluctuations in the integrated critical current of the sample. The excess noise due to this dynamic admixture of two distinct phases is found to display pronounced re-entrant behavior. In the Corbino geometry the injection of the metastable phase is prevented and, accordingly, the excess noise disappears.
PACS: 74.40.+k – Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.) / 74.60.Ec – Mixed state, critical fields, and surface sheath / 74.60.Ge – Flux pinning, flux creep, and flux-line lattice dynamics
© EDP Sciences, 2002
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.