Physics – Condensed Matter – Superconductivity
Scientific paper
2007-08-29
Physica C 467, 67-72 (2007)
Physics
Condensed Matter
Superconductivity
17 Pages text + Figs
Scientific paper
10.1016/j.physc.2007.08.011
The enhancement of the critical current density (Jc(H)) of carbon and nano-SiC doped MgB2 is presented and compared. The upper critical field (Hc2) being determined from resistivity under magnetic field experiments is though improved for both C substitution and nano-SiC addition the same is more pronounced for the former. In MgB2-xCx carbon is substituted for boron that induces disorder in the boron network and acts as internal pinning centres. The optimal Jc(H) values are obtained for x = 0.1 sample . In case of nano-SiC doped in MgB2, the Jc(H) improves more profoundly and two simultaneous mechanisms seems responsible to this enhancement. Highly reactive nano-SiC releases free carbon atom, which gets easily incorporated into the MgB2 lattice to act as intrinsic pinning centres. Further enhancement is observed for higher nano-SiC concentrations, where the un-reacted components serve as additional extrinsic pinning centres.
Acharya Somobrata
Awana* V. P. S.
Felner Israel
Kishan Hari
Mudgel Monika
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