2007/01/16 by Zhaoshun Gao, Gao, Zhaoshun, Yanwei Ma +17
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Iron-based superconductors research #Materials Science (cond-mat.mtrl-sci) #Physics of Superconductivity and Magnetism #Superconductivity (cond-mat.supr-con) #Superconductivity in MgB2 and Alloys #cond-mat.mtrl-sci #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.cond-mat/0701373
17 pages, 6 figures
openalex publication_date 2007/01/16 · arxiv created 2007/02/14 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Fe-sheathed MgB2 tapes with cheap stearic acid, Mg stearate and Zn stearate doping were prepared through the in situ powder-in-tube method. It is found that Jc, Hirr, and Hc2 were significantly enhanced by doping. Compared to the pure tapes, Jc for all the doped samples was improved by more than an order of magnitude in a high-field regime. At 4.2 K, the transport Jc reached 2.02x104 A/cm2 at 10 T for the Zn stearate doped tapes and 3.72x103 A/cm2 at 14 T for the stearic acid doped samples, respectively, equivalent to that of tapes achieved by nanoscale SiC or carbon doping. The improvement of Jc-H properties in doped samples can be attributed to the increase of Hc2 resulting from the incorporation of C atoms into the MgB2 crystal lattice as well as a high density of flux-pinning centers.