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The properties of superconducting joints for REBa2Cu3Oy (REBCO, RE = rare earth) superconducting tapes fabricated using a slurry process were investigated. Microstructural observation revealed that a joining layer fabricated using a slurry was well-connected to the REBCO layer of the joined tape. The resistance and critical current of closed-loop samples containing slurry-processed superconducting joint were evaluated using current decay measurements. The joint resistance was found to be lower than 10−12 and 10−11 Ω at 4 and 77 K, respectively, in the self-field. It is inferred that a persistent current can flow through a slurry-processed superconducting joint. Conversely, in-field critical current was low and exhibited hysteresis due to weak links in the joining layer.

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  © 2026 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

Keyword: superconducting joint, high-temperature superconductor

Date published: 2026-01-12

Publisher: Institute of Electrical and Electronics Engineers (IEEE)

Journal:

• IEEE Transactions on Applied Superconductivity (ISSN: 10518223) vol. 36 issue. 5

Funding:

• JST-Mirai Program JPMJMI17A2
• JSPS KAKENHI JP22K14482

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.6133

First published URL: https://doi.org/10.1109/tasc.2025.3649135

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Updated at: 2026-01-16 14:41:52 +0900

Published on MDR: 2026-01-19 12:21:44 +0900