Biaxially Textured YBa₂Cu₃O_7-δ Conductors on Rolling Assisted Biaxially Textured Substrates with Critical Current Densities of 2–3 mA/cm²

Abstract

Epitaxial YBa 2 Cu 3 O 7-δ (YBCO) films with transport critical current densities approaching 3×10 6 A/cm 2 (77 K, 0 T) were fabricated using laser ablation of YBCO onto rolling-assisted biaxially textured-substrates (RABiTS) using a combination of thin CeO 2 and thick YSZ buffer layers. The configuration of the sample was YBCO (∼0.2 µm)/YSZ (0.7 µm)/CeO 2 (0.05 µm)/Ni (125 µm). The CeO 2 and YSZ buffer layers were deposited using electron-beam evaporation and sputtering, respectively. The temperature window for successful pulsed-laser deposition of YBCO onto RABiTS was found to be between 740°C and 790°C.