A1 Refereed original research article in a scientific journal
Enhanced Critical Current Density in Heterostructural YBCO/Ca-Doped YBCO Multilayers
Authors: Aye, Moe Moe; Rivasto, Elmeri; Huhtinen, Hannu; Paturi, Petriina
Publisher: American Chemical Society
Publication year: 2024
Journal: Crystal Growth and Design
Journal name in source: Crystal Growth & Design
Volume: 24
Issue: 11
First page : 4545
Last page: 4555
ISSN: 1528-7483
eISSN: 1528-7505
DOI: https://doi.org/10.1021/acs.cgd.4c00200
Web address : https://doi.org/10.1021/acs.cgd.4c00200
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/404740258
We conducted experiments involving BZO-added YBCO/Ca-doped YBCO heterostructures with varying layer numbers to investigate the role of Ca doping and the mechanism behind the enhanced Jc. Our findings reveal that the inclusion of Ca-doped layers enhances the quality of the YBCO matrix within the BZO-added layer by reducing microstrain and the formation of other crystalline defects, while also optimizing the oxygen content of YBCO with the increasing layer number. These structural improvements lead to a significant increase in self-field Jc(0), which is also observed to correspond to an increase in in-field Jc(B) without directly impacting flux pinning. The remarkable enhancement in Jc at 65 K can be explained by a theoretical model, where the improvement in Jc at high temperatures is attributed to the more coherent interface between the BZO nanorods and the YBCO matrix. Therefore, we conclude that the overall enhancement of Jc in the Ca-doped heterostructures is attributed to the improved crystalline structure rather than enhanced flux pinning.
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