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Pulsed-field magnetisation of Y-Ba-Cu-O bulk superconductors fabricated by the infiltration growth technique

Accepted version
Peer-reviewed

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Type

Article

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Authors

Takahashi, K 
Hirano, T 
Kamada, T 
Fujishiro, H 

Abstract

jats:titleAbstract</jats:title> jats:pBulk high temperature superconductors based on the rare-earth copper oxides can be used effectively as trapped field magnets capable of generating large magnetic fields. The top-seeded infiltration growth (TSIG) processing technique can provide a more homogeneous microstructure and therefore more uniform superconducting properties than samples grown using conventional melt growth processes. In the present investigation, the properties of bulk, single grain superconductors processed by TSIG and magnetised by the pulsed-field magnetisation technique using a copper-wound solenoid have been studied. A trapped field of ∼3 T has been achieved in a 2-step buffer-assisted TSIG-processed Y-Ba-Cu-O (YBCO) sample at 40 K by magnetising the bulk superconductor completely via a single-pulse magnetisation process. Samples were also subjected to pulsed-field magnetisation at 65 K and by conventional field-cooled magnetisation at 77 K for comparison. Good correlation was observed between the microstructures, critical current densities and trapped field performance of bulk samples fabricated by TSIG and magnetised by pulsed-field and field-cooled magnetisation. The homogeneous distribution of Yjats:sub2</jats:sub>BaCuOjats:sub5</jats:sub> inclusions within the microstructure of bulk YBCO samples fabricated by the 2-step buffer-assisted TSIG process reduces inhomogeneous flux penetration into the interior of the sample. This, in turn, results in a lower temperature rise of the bulk superconductor during the pulsed-field magnetisation process and a more effective and reliable magnetisation process.</jats:p>

Description

Keywords

pulsed-field magnetisation, bulk YBCO, infiltration and growth, trapped field, homogeneous and dense microstructure, flux-pinning strength

Journal Title

Superconductor Science and Technology

Conference Name

Journal ISSN

0953-2048
1361-6668

Volume Title

33

Publisher

IOP Publishing

Rights

All rights reserved
Sponsorship
King Abdulaziz City for Science and Technology (KACST) (unknown)
Engineering and Physical Sciences Research Council (EP/P00962X/1)
Engineering and Physical Sciences Research Council (EP/P020313/1)
Japan Society for the Promotion of Science (15K04646)
KACST
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