Saturday, 3G-01, 11:45-11:50

Enhanced flux pinning by BaZrO₃ doping in fluorine-free Metal-Organic Deposited YBa₂Cu₃O_7-δ films on buffered RABiTS substrates

F. Lu

F. Kametani, D. C. Larbalestier and E. E. Hellstrom

Applied Superconductivity Center, National High Magnetic Field Laboratory, Tallahassee, FL 32310 USA
PHONE: (850)-645-8411,FAX: (850) 645-7754, EMAIL: fenglu@asc.magnet.fsu.edu,

In this study, both pure and BaZrO₃ (BZO)-doped YBCO (YBCO + x BZO) films were fabricated on buffered RABiTS from AMSC by a fluorine-free metal organic deposition (MOD) process. In this work, we have succeeded in introducing nanoscale BaZrO₃ particles into YBCO by adding extra Ba and Zr organic salts. We were able to use multi-coating process to obtain highly-textured thick (up to ~ 1.1 Μm) films of both pure and BaZrO₃ (up to x = 0.15) doped content. SEM images showed mainly c-axis oriented grains and dense structures. The in-field critical current density is enhanced for BaZrO3-doped samples though the self field critical current density at 77K is slightly lower than pure YBCO. Consequently, the pinning force density in all BaZrO₃-doped YBCO samples is enhanced. The optimal BaZrO₃ doping content investigated in this work is x = 0.07 – 0.10. Maximum pinning force density exceeding 5.5 GN/m³ is obtained in ~ 0.8 μm YBCO + 0.07 BZO film. The angular dependence of in-field critical current density measurements shows the critical current density anisotropy is strongly reduced by BaZrO₃ doping at 1 T and 4 T, and the critical current density is enhanced over a wide angular range compared to pure YBCO. This indicates that fluorine-free MOD with chemical doping is a promising fabrication technique to create high pinning in YBCO coated conductors.

This work was supported by DOE-OETD.

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