Development of long YBCO coated conductor by IBAD-PLD method -: Self-epitaxial PLD-CeO2 cap layer on IBAD buffer substrate

Processing of a CeO2 layer on an IBAD-Gd2Zr2O7 buffer tape was investigated as a cap layer. In the process of this study, we found that the CeO2 cap layer by the PLD method on the IBAD buffer tape brought about high in-plane grain alignment without Ar ion assistance such as the IBAD process. The A(A value, degree of the in-plane grain alignment decreased from 25.4 degrees and 11.6 degrees for the IBAD-GZO to 4.9 degrees and 2.4 degrees for the PLD-CeO2, respectively. We call this phenomenon "self-epitaxial PLD-CeO2 cap layer". Then, we suggested a new process which is a combination of a thin IBAD-GZO by short time deposition and a PLD-CeO2 with high rate deposition in order to enhance the fabrication rate for the buffer layer process. The new self-epitaxial process is very promising as a buffer layer process in terms of both high grain alignment and rapid fabrication.