Microstructure of artificial 45(sup degree) (001) tilt grain boundaries in YBCO films grown on (001) MgO

摘要

High-angle grain boundaries in YBa(sub 2)Cu(sub 3)O(sub 7-x) (YBCO) show weak-link effects and behave as Josephson junctions. This kind of grain boundary junction (GBJs) has potential applications in magnetic field measurement and electronic devices. This work studies the microstructure of artificially made GBJs in YBCO films on (001) MgO and the mechanism of boundary formation, with the goal to improve GBJ quality and obtain a better understanding of the junctions' transport properties.