Significant reduction of AC losses in YBCO patterned coated conductors with transposed filaments

We report on a first implementation of a design which provides a significant reduction of AC losses in YB 2 Cu 3 O 7−δ (YBCO) coated conductors (CCs) without mechanical twisting. The conductor is composed of two diffusively bonded silver clad commercial CCs with zigzag patterned filaments partially separated by a dielectric layer. We produced three fully bonded samples with 500 µm wide filaments using three-stage photolithography and wet chemical etching. A tenfold reduction of AC losses at frequencies between 20 and 400 Hz was observed, while transport measurements and magneto-optical imaging showed no degradation of T c and a low contact resistance of between Ag and YB 2 Cu 3 O 7−δ .