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REBa2Cu3Oy (REBCO, where RE is a rare-earth element) coated conductors (CCs) fabricated using the trifluoroacetate metal organic deposition (TFA–MOD) method are promising for various electric power applications, such as superconducting cables, motors, and generators. This is due to their low cost and high criticaenter code herel current (Ic) under high magnetic fields, even at liquid nitrogen temperatures. REBCO CCs offer significant advantages in direct current applications because of their negligible energy loss. However, for alternating current (AC) applications, they exhibit substantial AC loss, which necessitates effective reduction strategies. The multifilamentation technique is a proven method for reducing AC loss; however, the application of laser scribing to achieve multifilamentation in TFA–MOD-derived CCs poses challenges. The presence of pores in these CCs can lead to the delamination of the superconducting layer. Previously, we successfully fabricated long-length BaZrO3 nanoparticle-doped Y0.77Gd0.23Ba2Cu3Oy ((Y,Gd)BCO+BZO) CCs by employing an intermediate heating temperature technique and an ultra-once coating method, resulting in pore-free CCs.
In this study, we applied laser scribing to create multiple filaments in (Y,Gd)BCO+BZO CCs and evaluated its impact on superconducting properties. The four-filament scribed (Y,Gd)BCO+BZO CCs demonstrated no delamination, and the Ic value was approximately 20 A per filament (with a filament width of ~1 mm) in short CCs at 77 K under self-field conditions.
This paper details the superconducting properties and AC loss characteristics of scribed (Y,Gd)BCO+BZO CCs with varying filament numbers, offering insights into their potential for AC applications.
This study is based on findings obtained from Project, which was subsidized by the New Energy and Industrial Technology Development Organization.
