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Development of high critical current density in multifilamentary round-wire by strong overdoping
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View: Figures


Image of FIG. 1.
FIG. 1.

Significant increases occur in the self field and 5 T, 4.2 K transport of Bi-2212 round wire in the final stage of the partial-melt process (inset). In flowing 1 bar , samples were melted at a maximum temperature of and slowly cooled at to , where they were annealed for 48 h before being cooled at to room temperature. Samples were quenched at 836, 650, and . A fully-processed (FP) wire and an oxygen-rich sample, which was quenched at then post annealed at for 30 h in 1 bar flowing , are also shown. These samples are referred to Q836C, Q650C, Q330C, FP, and . The dashed lines are given to guide the eye.

Image of FIG. 2.
FIG. 2.

Zero-field-cooled magnetic moments of Ag-sheathed Bi-2212 multifilament round wire Q836C, Q650C, Q330C, FP, and induced by warming in a field of 1 mT applied parallel to the wire axis, indicates that significant oxygen overdoping occurs during the final cooling to room temperature.

Image of FIG. 3.
FIG. 3.

Kramer irreversibility field as a function of temperature for Q836C, Q650C, Q330C, FP, and . Inset shows our method of determining .

Image of FIG. 4.
FIG. 4.

Dependence of the remanent magnetic moment (inset) and its derivative for the Bi-2212 round wires as measured for increasing fields applied parallel to the wire axis at 5 K. Note that the greatest connectivity is shown by sample .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Development of high critical current density in multifilamentary round-wire Bi2Sr2CaCu2O8+δ by strong overdoping