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