High transport currents in mechanically reinforced MgB2 wires

By W. Goldacker, S. Schlachter, S. Zimmer, H. Reiner. 2001

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We prepared and characterized monofilamentary MgB2 wires with a mechanically reinforced composite sheath of Ta(Nb)/Cu/steel, which leads to dense filaments and correspondingly high transport currents up to Jc = 105 A cm-2 at 4.2 K under self-field. The reproducibility of the measured transport currents was excellent and did not depend on the wire diameter. Using different precursors, commercial reacted powder or an unreacted Mg/B powder mixture, a strong influence on the pinning behaviour and the irreversibility field was observed. The critical transport current density showed a nearly linear temperature dependency for all wires being still 52 kA cm-2 at 20 K and 23 kA cm-2 at 30 K. Detailed data for Jc(B,T) and Tc(B) were measured.

Subfields: Biomedical Engineering, Condensed Matter Physics

View Paper: https://www.semanticscholar.org/paper/6ecb1429c7bd69ebb0e0ffc5b360543bc938f499