Fabrication and demonstration of REBa₂Cu₃O_y thin film for high-frequency applications

Abstract

High-temperature superconductor REBa₂Cu₃O_y (REBCO) microwave devices offer excellent performance. Microwave receive filters using REBCO film have excellent performance with low loss and sharp skirt characteristics and are already used in the receiving systems of mobile communication systems. However, practical applications of microwave devices using REBCO films are limited to receive filters. One reasons for the lack of progress is the low characteristics of the REBCO thin film. Recently, we reported that the characteristics of the REBCO thin film can be significantly improved via metal organic deposition using the trifluoroacetate (TFA-MOD) method and substrate annealing process. Herein, we introduce the TFA-MOD method and substrate annealing for the fabrication of REBCO thin films for high-frequency applications and demonstrate superconducting high-frequency devices based on these films.