M. Konishi et al., HOMOEPITAXIAL GROWTH OF YBCO THIN-FILMS ON YBCO SINGLE-CRYSTALS, IEEE transactions on applied superconductivity, 5(2), 1995, pp. 1229-1232
YBCO films were grown on (001) YBCO single crystal substrates using th
e off-axis RF magnetron sputtering method. The interface between the s
ubstrate and the film was observed using TEM. The crystal orientation
of the film was found to be dependent on the growth temperature. C-axi
s oriented films with smooth interfaces and holes on their surfaces we
re obtained at 760 degrees C. A-axis oriented films grown at 580 degre
es C surfaces, but the interface rather poor. Lattice mismatches occur
red atthe interface due to deoxidization and oxidization of the substr
ate during the film growth process.