Development of homogeneous and high-performance REBCO bulks with various shapes by the single-direction melt growth (SDMG) method

We have developed a single-direction melt growth method in which REBCO melt-textured bulks grow only vertically from a seed plate utilizing the difference in peritectic temperatures of REBCO. Entirely c -grown YBCO, DyBCO and GdBCO bulks with various sizes and shapes were successfully fabricated wit...

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Bibliographic Details
Published in:Superconductor science & technology 2022-09, Vol.35 (9), p.94003
Main Authors: Motoki, Takanori, Sasada, Rempei, Tomihisa, Takuma, Miwa, Masaya, Nakamura, Shin-ichi, Shimoyama, Jun-ichi
Format: Article
Language:English
Subjects:
melt grown bulk
REBCO
single-direction melt growth
superconducting joint
trapped field
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Summary:We have developed a single-direction melt growth method in which REBCO melt-textured bulks grow only vertically from a seed plate utilizing the difference in peritectic temperatures of REBCO. Entirely c -grown YBCO, DyBCO and GdBCO bulks with various sizes and shapes were successfully fabricated with high reproducibility. Disk-shaped bulks showed high trapped fields with almost concentric field distributions, reflecting homogeneous and boundaryless bulk structures. In particular, a YBCO bulk with a 32 mm diameter trapped a high field more than 1 T at 77 K. Furthermore, rectangular and joined hexagonal REBCO bulks were successfully fabricated, showing designed field-trapping distributions reflecting their shapes through well-connected superconducting joints among bulks.
ISSN:0953-2048
1361-6668
DOI:10.1088/1361-6668/ac811e