Physics – Condensed Matter – Superconductivity
Scientific paper
2002-07-03
J. Appl. Phys. 94, 1850-1856 (2003)
Physics
Condensed Matter
Superconductivity
7 pages, 8 figures
Scientific paper
10.1063/1.1586467
We investigated the effect of SiC nano-particle doping on the crystal lattice structure, critical temperature T_c, critical current density J_c, and flux pinning in MgB_2 superconductor. A series of MgB_{2-x}(SiC)_{x/2} samples with x = 0 to 1.0 were fabricated using in-situ reaction process. The contraction of the lattice and depression of T_c with increasing SiC doping level remained rather small due to the counter-balanced effect of Si and C co-doping. The high level Si and C co-doping allowed the creation of intra-grain defects and highly dispersed nano-inclusions within the grains which can act as effective pinning centers for vortices, improving J_c behavior as a function of the applied magnetic field. The enhanced pinning is mainly attributable to the substitution-induced defects and a local structure fluctuations within grains. A pinning mechanism is proposed to account for different contributions of different defects in MgB_{2-x}(SiC)_{x/2} superconductors.
Dou Shi Xue
Horvat Joseph
Ionescu Marius
Liu Hsin-Kuan
Munroe P. R.
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