Physics – Condensed Matter – Superconductivity
Scientific paper
2006-01-11
Appl. Phys. Lett. 88, 072502 (2006)
Physics
Condensed Matter
Superconductivity
13 pages, 5 figures. to be published soon
Scientific paper
10.1063/1.2173635
Nanocarbon-doped Fe-sheathed MgB2 tapes with different doping levels were prepared by the in situ powder-in-tube method. Compared to the undoped tapes, Jc for all the C-doped samples was enhanced by more than an order of magnitude in magnetic fields above 9 T. At 4.2 K, the transport Jc for the 5 at% doped tapes reached 1.85x104 A/cm2 at 10 T and 2.8x103 A/cm2 at 14 T, respectively. Moreover, the critical temperature for the doped tapes decreased slightly. Transmission electron microscopy showed a number of intra-granular dislocations and the dispersed nanoparticles embedded within MgB2 grains induced by the C doping. The mechanism for the enhancement of flux pinning is also discussed. These results indicate that powder-in-tube-processed MgB2 tape is very promising for high-field applications.
Bai Xuedong
Ma* Yanwei
Nishijima Gen
Watanabe Katsuhiro
Zhang Xianping
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