Physics – Condensed Matter – Superconductivity
Scientific paper
2007-01-16
Physics
Condensed Matter
Superconductivity
17 pages, 6 figures
Scientific paper
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 2.02x10^4 A/cm^2 at 10 T for the Zn stearate doped tapes and 3.72x10^3 A/cm^2 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.
Bai Xuedong
Gao Zhaoshun
Ma* Yanwei
Wang Dongliang
Watanabe Katsuhiro
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