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Doping Effect of Nano-Diamond on Superconductivity and Flux Pinning in MgB2

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arxiv cond-mat/0302202 v1 pith:CNRGNOLA submitted 2003-02-11 cond-mat.supr-con

C.H. Cheng , H. Zhang , Y. Zhao , Y. Feng , X.F. Rui , P. Munroe , H.M. Zeng , N. Koshizuka
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M. Murakami
This is my paper · ORCID
classification cond-mat.supr-con
keywords mgb2diamondnanoparticlesdensitydiamond-dopeddopingeffectenhanced
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Doping effect of diamond nanoparticles on the superconducting properties of MgB2 bulk material has been studied. It is found that the superconducting transition temperature Tc of MgB2 is suppressed by the diamond-doping, however, the irreversibility field Hirr and the critical current density Jc are systematically enhanced. Microstructural analysis shows that the diamond-doped MgB2 superconductor consists of tightly-packed MgB2 nano-grains (~50-100 nm) with highly-dispersed and uniformly-distributed diamond nanoparticles (~10-20 nm) inside the grains. High density of dislocations and diamond nanoparticles may take the responsibility for the enhanced flux pinning in the diamond-doped MgB2.

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