Critical current in YBa2Cu3O7 ceramics
| Autor: | W. D. Macdonald, B. A. Judd, E. Batalla, L. S. Wright, A. J. Otto, H. Sang, E. G. Zwartz |
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| Rok vydání: | 1989 |
| Předmět: |
Josephson effect
Superconductivity Materials science Field (physics) Condensed matter physics Orders of magnitude (temperature) Direct current Superconducting magnetic energy storage Condensed Matter Physics Granular material Atomic and Molecular Physics and Optics Magnetic field Condensed Matter::Superconductivity General Materials Science |
| Zdroj: | Journal of Low Temperature Physics. 74:277-291 |
| ISSN: | 1573-7357 0022-2291 |
| DOI: | 10.1007/bf00683376 |
| Popis: | Measurements of critical currents using a four-point direct current (dc) method and an alternating magnetic field method have been performed on several superconducting YBa2Cu3O7 ceramics at 77 K. In the presence of a constant magnetic field, the critical currents obtained with the alternating field method are several orders of magnitude larger than the critical currents measured by the dc method. Also, we observed a minimum in the dc critical current as a function of applied transverse magnetic field. Several authors have suggested that these ceramics behave as individual superconducting grains coupled by Josephson junctions. In this paper, we explain the two observations above using that model. |
| Databáze: | OpenAIRE |
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