High-Current Laser-Ablated YBCO Tape with Biaxially Aligned Structure

Abstract

High Current YBCO thin film tapes were fabricated using flexible tapes of Ni-based alloy (15 cm length, 1.0 cm width, 0.2 mm thick). In order to avoid Jc degradation by intergranular weak-links, biaxially aligned structure (c-axis aligned normal, and a-b basal plane also aligned) was formed by using ion-beam-modified YSZ buffer layers. A tape sample of YBCO thickness of 2.0 µm was obtained that had Ic values of 52 A (Jc = 2.6×10⁵ A/cm²), and 103 A (Jc = 5.2×10⁵ A/cm²) at 77K, 0T, measured with length of 10 cm, and 1 cm, respectively. Jc values of 6.2×10⁵ A/cm² (Ic=93A), and 2.6×10⁵ A/cm² (Ic=39A) were obtained at 77 K, with 0 T, and 0.6T (B⊥c, B⊥I), respectively, in a part of a tape sample with the YBCO thickness of 1.5µm.