Effect of nano-particle doping on the upper critical field and flux pinning in MgB2

Authors

S X. Dou, University of WollongongFollow
Saeid Soltanian, University of WollongongFollow
W. K. Yeoh, University of Wollongong
Y. Zhang, University of Wollongong

RIS ID

13705

Publication Details

This article was originally published as: Dou, SX, Soltanian, S, Yeoh, WK and Zhang, Z, Effect of Nano-Particle Doping on the Upper Critical Field and Flux Pinning in MgB2, IEEE Transactions on Applied Superconductivity, June 2005, 15(2), 3219-3222. Copyright IEEE 2005.

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Abstract

The effect of nano particle doping on the critical current density of MgB₂ is reviewed. Most nano-particle doping leads to improvement of J_c(H) performance while some shows a negative effect as with Cu and Ag. Nano-carbon containing dopants have two distinguishable contributions to the enhancement of J_c field performance: increase of upper critical field and improvement of flux pinning. Among all the dopants studied so far, nano SiC doping showed the most significant and reproducible enhancement in J_c(H). The nano SiC doping introduced many precipitates at a scale below 10 nm, which serve as strong pinning centers. J_c for the nano SiC doped samples increased by more than an order of magnitude at high fields and all temperatures compared to the undoped samples. The significant enhancement in J_c(H) of nano-SiC doping has been widely verified and confirmed, having a great potential for applications. An attempt is made to clarify the controversy on the effects of nano Fe and Ti doping on J_c.