Development of high critical current density in multifilamentary round-wire Bi2 Sr2 CaCu2 O8+δ by strong overdoping

T. Shen, J. Jiang, A. Yamamoto, U. P. Trociewitz, J. Schwartz, E. E. Hellstrom, D. C. Larbalestier

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Abstract

Bi2 Sr2 CaCu2 O8+δ 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 1.4× 105 A/ cm2 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, an increase in flux pinning, and particularly 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.

Original languageEnglish (US)
Article number152516
JournalApplied Physics Letters
Volume95
Issue number15
DOIs
StatePublished - Oct 22 2009

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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    Shen, T., Jiang, J., Yamamoto, A., Trociewitz, U. P., Schwartz, J., Hellstrom, E. E., & Larbalestier, D. C. (2009). Development of high critical current density in multifilamentary round-wire Bi2 Sr2 CaCu2 O8+δ by strong overdoping. Applied Physics Letters, 95(15), [152516]. https://doi.org/10.1063/1.3242339