Abstract
In order to fabricate long and high critical current coated conductors, new facilities for a continuous ion-beam assisted deposition (IBAD) and a pulsed laser deposition (PLD) were installed at SRL-Nagoya Coated Conductor Center (NCCC). We found a PLD-CeO 2 cap layer deposited on an IBAD Gd–Zr-oxide (GZO) layer realized quite high grain alignment as well as much higher deposition rate than the conventional IBAD process, and we call this phenomenon “self-epitaxy”. Thus, the CeO 2 cap layer enables an IBAD-buffer layer to be thinner, resulted in faster production speed than the conventional IBAD process. Using these facilities, we have accelerated the development of long coated conductors. A 105-m long IBAD tape and a 55-m long CeO 2 cap layer with high grain alignment were fabricated. A high critical current density of 0.96 MA/cm 2 at 77 K was obtained in the continuously deposited YBCO films with a reel-to-reel process on the self-epitaxial PLD-CeO 2 capped IBAD-GZO layers as well as those in short samples. Long YBCO conductor fabrication using the reel-to-reel PLD equipments is now undergoing.
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