Achieving High J c in High Fields in Multilayer BZO/YBCO Thick Films

Improved pinning efficiency of c-axis-aligned BaZrO3 nanorods (BZO-NRs) in BZO/YBa2Cu3O7 nanocomposite thin films was obtained recently using a multilayer (ML) approach, in which diffusion of Ca ions from two thin (Ca0.3Y0.7)BCO spacers (10 nm in thickness) sandwiched with three BZO/YBa2Cu3O7 layers...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2025-01, Vol.35 (5), p.1
Main Authors: Wu, Judy, Ogunjimi, Victor, Sebastian, Mary Ann, Mohan Panth, Shen, Jianan, Moceri, Matteo, Aafiya, Aafiya, Haugan, Timothy, Wang, Haiyan
Format: Article
Language:English
Subjects:
Anisotropy
Barium zirconates
Calcium ions
Diffusion layers
Multilayers
Nanocomposites
Nanorods
Pinning
Thick films
Thickness
Thin films
YBCO superconductors
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Summary:Improved pinning efficiency of c-axis-aligned BaZrO3 nanorods (BZO-NRs) in BZO/YBa2Cu3O7 nanocomposite thin films was obtained recently using a multilayer (ML) approach, in which diffusion of Ca ions from two thin (Ca0.3Y0.7)BCO spacers (10 nm in thickness) sandwiched with three BZO/YBa2Cu3O7 layers. The subsequent Ca (30% larger)/Cu substitution at the Cu-O planes of YBCO was found energetically preferable by inducing c-axis elongation of the YBa2Cu3O7 lattice near the BZO-NRs/YBa2Cu3O7 interface to enable a coherent interface via reducing the BZO/YBCO lattice mismatch from originally 7.7% to 1.4%, leading to significantly enhanced J c ( B ) and F p in thin ML films of 150 nm in thickness. This work investigates whether improved pinning could be achievable in thicker BZO-NRs/YBa2Cu3O7 ML films with the thickness increased to 1000 nm. Interestingly, similar pinning enhancement has been observed in thick BZO-NRs/YBa2Cu3O7 ML films across a wide temperature range of 20–80 K. In particular, the thicker BZO-NRs/YBa2Cu3O7 ML films outperform their thinner counterparts in both higher value and less anisotropy of J c ( B ). At 1000 nm thickness, I c (30 K, 9T) reaches up to ∼680 A/cm-width with a variation of ∼85% over the entire angular range of B field orientations. This result illustrates the critical role of Ca diffusion at the BZO-NRs/YBCO interface for improving pinning efficiency of BZO-NRs in a wide range of temperatures and B fields.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2024.3512530