Artificial Flux Pinning in MOD-REBCO Coated Conductors with Thick Superconducting Layer

• Published in: IEEE transactions on applied superconductivity 2024-05, Vol.34 (3), p.1-5
• Main Authors: Huang, Rongtie, Chen, Jing, Liu, Zhiyong, Li, Yong, Jian, Hongbin, Zhang, Ning, Dou, Wenzhi, Zhou, Difan, Li, Minjuan, Guo, Yanqun, Cai, Chuanbing
• Format: Article
• Language: English
• Subjects: Barium zirconates; Conductors; Doping; Flux pinning; high temperature superconductor; Measuring instruments; Morphology; nanocrystal; Nanocrystals; Superconducting epitaxial layers; Superconducting films; Superconducting integrated circuits; Superconductivity; Thickness; YBa2Cu3O7−δ nanocomposite; YBCO superconductors; Yttrium barium copper oxide
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/TASC.2023.3343334

The BaZrO 3 (BZO) and BaHfO 3 (BHO) nanocrystal addition strategy was extended to up-scaling YBa 2 Cu 3 O 7 -δ (YBCO) coated conductors as long as hundreds of meters with a superconducting layer thickness of 3.2 μm. The I c (77 K, self-field) achieved 1000A/12mm-width with 5 mol% BZO addition. It is revealed that the I c (77 K, self-field) of YBCO thick tapes decreases to 700 A with BHO concentration up to 10%, while its in-field Ic enhances to 1450 A at 30 K@3 T. The transport measurement showed that the Ic@4.2 K at a high field as 20 T achieved 290 A/4 mm-width. The angular dependence of in-field Ic demonstrated that significant improvement occurs in almost the angular range after nanocrystal additions except B//ab. Interestingly, due to the addition of small-size nanocrystals as pinning centers, the I c @77 K under the field< 2 T exhibited near isotropic behaviors when applied to different magnetic field angles.