2001/06/01 by Hiroaki Kumakura, H. Kumakura, A. Matsumoto +3 · 218 citations
Materials Science · Physics and Astronomy · #Composite material #Condensed matter physics #Core (optical fiber) #Critical current #Current density #Iron-based superconductors research #Materials science #Metallurgy #Physics of Superconductivity and Magnetism #Superconductivity #Superconductivity in MgB2 and Alloys #Tube (container) #cond-mat.supr-con
paper · pdf · doi:10.1063/1.1407856
published in Applied Physics Letters 79(15), 2435-2437 (American Institute of Physics) · 4 pages, 3 figures
arxiv created 2001/06/01 · openalex publication_date 2001/10/08 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
MgB 2 tapes and wires were fabricated by the powder-in-tube method. Stainless steel and Cu–Ni tubes were used as sheath materials, and no heat treatment was applied. The tapes made of stainless steel showed transport critical current density Jc of about 10 000 A/cm2 at 4.2 K and 5 T. A high Jc of about 300 000 A/cm2 was obtained by extrapolating the Jc–B curves to zero field. Multifilamentary (seven-core) MgB2 wire was successfully fabricated using Cu–Ni tubes. For both tapes and wires, the grain connectivity of MgB2 was as good as a high-pressure sintered bulk sample. However, the Jc of the Cu–Ni sheathed wire was lower than the stainless steel sheathed tape due to the lower packing density of MgB2.