High critical current density in internally-oxidized Nb3Sn superconductors and its origin

We report achievement of non-Cu-matrix critical current density (Jc) in internally-oxidized Nb3Sn superconductors that surpasses the best state-of-the-art Nb3Sn and the Jc specification of the Future Circular Collider. We then explore the mechanism of the improvement, which was believed to be caused...

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Bibliographic Details
Published in:Scripta materialia 2020-09, Vol.186, p.317-320
Main Authors: Xu, Xingchen, Peng, Xuan, Rochester, Jacob, Lee, Jae-Yel, Sumption, Mike
Format: Article
Language:English
Subjects:
Atom probe tomography
Critical current density
Grain refining, precipitation
Low-temperature superconductors
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Summary:We report achievement of non-Cu-matrix critical current density (Jc) in internally-oxidized Nb3Sn superconductors that surpasses the best state-of-the-art Nb3Sn and the Jc specification of the Future Circular Collider. We then explore the mechanism of the improvement, which was believed to be caused by refined grain size. However, our experiment showed that even with similar grain size, internally-oxidized wires had significantly higher Jc than non-oxidized wires. This, combined with transmission electron microscopy and atom probe tomography studies which showed a high density of intragranular nano-precipitates with suitable sizes as pinning centers in internally-oxidized wires, demonstrates a significant contribution from the nano-precipitates. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2020.05.043