Activity in SRL Nagoya Coated Conductor Center for YBCO Coated Conductor by IBAD+ PLD Method ‐Long, high Ic conductor and a new bamboo‐like nanostructure for efficient pinning

In SRL-Nagoya Coated Conductor Center (NCCC), long buffered substrate tapes and YBCO coated conductors have been successfully fabricated by using ion-beam assisted deposition (IBAD) and pulsed laser deposition (PLD) methods. For the buffered tape, the PLD-CeO2 method, what we call the "Self-Epitaxial" method, realized the high degree of inplane texturing around 4 degrees along the length of 220 m. For YBCO deposition, we have recently introduced new reel-to-reel PLD equipment with a multi-plume and multi-turn. deposition system (MPMT PLD). This system succeeded in fabricating a long coated conductor with a high critical current, I-c, of 245 A and length of 212 m. I-c xL (length) reached the world record of 51940 Am. Furthermore, the introduction of artificial pinning center and RE 123 materials were also studied for improving flux pinning and enhancing I,. A new columnar structure of the "bamboo structure" (BaZrO3/Y123 layer-stacked structure) was found in Y123+YSZ sample. This columnar structure and the stacking faults in Gd123 were found to be effective for enhancing pinning properties. Using these techniques, we have succeeded in increasing I-c at 0 T to 480 A/cm and also enhancing I-c in a magnetic field.