Flux pinning in Bi-2212/Ag-based wires and coils
- Istituto Nazionale di Fisica Nucleare, Sezione di Genova, Via Dodecaneso 33, I 16146 Genova (Italy)
- Institute of Electrical Engineering, Slovak Academy of Sciences, Dubravska cesta, 84239 Bratislava (Slovak Republic)
- Department of Physics, University of Tennessee, Knoxville, Tennessee 37996-1200 (United States)
This paper describes a study of pinning forces in Ag/Bi-based wires and small coils. The goal of this analysis is to characterize and to compare the main pinning mechanisms in wires (short samples) and prototype practical devices, e.g., coils (long samples). The effects of thermal activation were found to hinder the straightforward determination of the pinning parameters from the critical current data. However, we succeeded in extracting these parameters from the irreversibility line. The scaling law for the pinning force employing the irreversibility field in virtue of the scale for magnetic fields was derived theoretically. The best fit to the experimentally determined pinning forces gave the flux-creep model corresponding to the power-law current{emdash}voltage dependence {ital J}{proportional_to}{ital E}{sup {ital n}}. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 388340
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 54, Issue 17; Other Information: PBD: Nov 1996
- Country of Publication:
- United States
- Language:
- English
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