TY - JOUR
T1 - Role of carbon in enhancing the performance of MgB2 superconductor
AU - Awana, V. P.S.
AU - Vajpayee, Arpita
AU - Mudgel, Monika
AU - Rawat, Rajeev
AU - Acharya, Somobrata
AU - Kishan, H.
AU - Takayama-Muromachi, E.
AU - Narlikar, A. V.
AU - Felner, I.
PY - 2007/12/1
Y1 - 2007/12/1
N2 - 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.
AB - 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.
KW - Critical current density
KW - Flux pinning
KW - MgB superconductor
KW - Nano-particle doping
UR - http://www.scopus.com/inward/record.url?scp=36148995424&partnerID=8YFLogxK
U2 - 10.1016/j.physc.2007.08.011
DO - 10.1016/j.physc.2007.08.011
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AN - SCOPUS:36148995424
SN - 0921-4534
VL - 467
SP - 67
EP - 72
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - 1-2
ER -