Scaling of the volume pinning force in superconducting wires and tapes based on Bi2Sr2CaCu2Ox
| Autor: | O. Vogt, J. Löhle, K. Mattenberger, P. Wachter |
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| Rok vydání: | 1994 |
| Předmět: | |
| Zdroj: | Journal of Applied Physics. 76:7446-7451 |
| ISSN: | 1089-7550 0021-8979 |
| DOI: | 10.1063/1.357971 |
| Popis: | Silver‐sheathed Bi2Sr2CaCu2Ox wires and tapes were fabricated by the powder‐in‐tube method. The wires show critical current densities of about 18 000 A/cm2 in zero magnetic field and 5300 A/cm2 in a field of 23 T at 4.2 K, respectively. A detailed study of the critical current density as a function of the temperature and the magnetic field resulted in a scaling behavior of the derived volume pinning force FV, which approximately obeys the formula FV≊H*h0.75(1−h)2.75. Here H* represents the irreversible field and h=H/H* is the scaling field. Further, the critical current densities of our textured tapes were measured. In zero magnetic field they reach critical current densities of about 43 000 A/cm2. In a magnetic field applied perpendicularly to the current direction the critical current density shows an anisotropic behavior with respect to the direction of the magnetic field. For a magnetic field of 23 T applied parallel to the tape plane the tapes reached critical current densities of about 15 000 A/cm2 ... |
| Databáze: | OpenAIRE |
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