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

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

2003-02-11

arxiv.org/abs/cond-mat/0302202v1

Physics

Condensed Matter

Superconductivity

16 pages, 6 figures

Scientific paper

10.1088/0953-2048/16/10/310

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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