Development of high critical current density in multifilamentary round-wire Bi2Sr2CaCu2O8+x by strong overdoping
| Autor: | Shen, T., Jiang, J., Yamamoto, A., Trociewitz, U. P., Schwartz, J., Hellstrom, E. E., Larbalestier, D. C. |
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| Rok vydání: | 2009 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1063/1.3242339 |
| Popis: | Bi2Sr2CaCu2O8+x is the only cuprate superconductor that can be made into a round-wire conductor form with a high enough critical current density Jc for applications. Here we show that the Jc(5 T,4.2 K) of such Ag-sheathed filamentary wires can be doubled to more than 1.4x10^5 A/cm^2 by low temperature oxygenation. Careful analysis shows that the improved performance is associated with a 12 K reduction in transition temperature Tc to 80 K and a significant enhancement in intergranular connectivity. In spite of the macroscopically untextured nature of the wire, overdoping is highly effective in producing high Jc values. Comment: 4 figures |
| Databáze: | arXiv |
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