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A bottom-up approach was employed to achieve multifilamentation aimed at reducing the alternating current (AC) losses of REBa₂Cu₃O7-δ coated conductors. Nb stripes were fabricated on SrTiO₃ substrates, followed by the deposition of YBa₂Cu₃O₇-δ (YBCO) thin films via the metal-organic deposition method. The films were subse quently evaluated and analyzed. Surface observations using scanning electron microscopy revealed a linear dark contrast on the stripes, distinct from the YBCO matrix. Furthermore, selected area electron diffraction patterns and scanning transmission electron microscopy-energy dispersive X-ray spectroscopy analyses confirmed the presence of multiple Y–Cu–O and Cu–O particles in the YBCO phase on a ~4 μm-wide Nb stripe. In addition, the formation of voids and Ba5Nb4O15 was observed in the ~4 μm Nb stripe. On a wider Nb stripe (~13 μm), only Y–Cu–O and Cu–O phases and cracks were observed, along with relatively large voids and the formation of Ba5Nb4O15. This study provides a fundamental understanding of multifilamented YBCO thin films and offers important insights into reducing AC losses.

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• Creative Commons BY Attribution 4.0 International
  

Keyword: YBa₂Cu₃O7-δ superconducting film, Multifilamentation, Film growth, Microstructure, Cross-sectional TEM

Date published: 2025-12-22

Publisher: Elsevier BV

Journal:

• Materials Today Communications (ISSN: 23524928) vol. 50 114552

Funding:

• Japan Society for the Promotion of Science

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.6085

First published URL: https://doi.org/10.1016/j.mtcomm.2025.114552

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Updated at: 2025-12-26 14:15:29 +0900

Published on MDR: 2026-01-02 17:31:06 +0900