Temperature dependence of filament-coupling in Bi-2223 tapes: magneto-optical study
| Autor: | M. Baziljevich, Yuri Galperin, A. V. Bobyl, Tom H. Johansen, M. E. Gaevski, D. V. Shantsev |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Coupling
Superconductivity Materials science Condensed matter physics Metals and Alloys Flux Condensed Matter Physics Magnetic flux Magneto optical Quantitative Biology::Subcellular Processes Protein filament Condensed Matter::Superconductivity Materials Chemistry Ceramics and Composites Perpendicular magnetic field Critical current Electrical and Electronic Engineering |
| Zdroj: | Superconductor Science and Technology. 13:183-186 |
| ISSN: | 1361-6668 0953-2048 |
| DOI: | 10.1088/0953-2048/13/2/312 |
| Popis: | Coupling through random superconducting bridges between filaments in a multifilamentary Ag-sheathed Bi2Sr2Ca2Cu3O10+ tape has been investigated by magneto-optical imaging at temperatures from 20 K up to Tc. Magnetic flux distributions have been measured on the surface of an intact tape in the remanent state on applying a strong perpendicular magnetic field. The flux distributions observed at low temperatures reflect the arrangement of individual filaments. At high temperatures, the distribution becomes more similar to that for a uniform monocore tape, indicating that superconducting connections appear between the filaments. To discuss the relative contributions of the intra- and inter-filament currents, a simple model based on the Bean critical state was proposed and applied to analyse the temperature dependent behaviour. The inter-filament coupling, increasing with temperature, reaches at 77 K a point where the currents flowing in large inter-filament loops are roughly equal to the intra-filament currents. |
| Databáze: | OpenAIRE |
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