2001/06/30 by W Goldacker, W. Goldacker, S. I. Schlachter +5 · 2 citations
Engineering · Physics and Astronomy · #Physics of Superconductivity and Magnetism #Superconducting Materials and Applications #Superconductivity in MgB2 and Alloys #cond-mat.supr-con
paper · pdf · doi:10.1088/0953-2048/14/9/331
published as Supercond. Sci. Technol. 14 (2001) 787-793 · 21 pages, 13 figures, revised version, to be published in Supercond. Sci. Technol
arxiv created 2001/07/05 · openalex publication_date 2001/08/22 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
We prepared and characterized monofilamentary MgB 2 wires with a mechanically reinforced composite sheath of Ta(Nb)/Cu/steel, which leads to dense filaments and correspondingly high transport currents up to J c = 10 5 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 J c ( B , T ) and T c ( B ) were measured.