Development of Long-length YBCO Superconductor Using IBAD/PLD

Abstract

We have developed 100-m class YBCO conductors using reel-to-reel vacuum apparatuses for ion-beam-assisted deposition (IBAD) and pulsed-laser deposition (PLD). IBAD-Gd₂Zr₂O₇ films 100m long were obtained with Δφ of 10°on non-textured Hastelloy tapes. Second buffer layers of Y₂O₃ or CeO₂ that were 100m long were grown by PLD on the IBAD templates with Δφ of 7°or 5°, respectively. YBCO films were formed on a Y₂O₃/Gd₂Zr₂O₇/Hastelloy substrate using PLD. An end-to-end I_c of 38 A and J_c of 0.76 MA/cm² (77 K, self-field) were obtained in a 100m-long sample.