Preparation of in-plane textured large-area YBCO films on (100) MgO with CeO2/YSZ buffer layers

Epitaxial YBa2Cu3Oy (YBCO) thin films with smooth surfaces have been succes sfully grown on large area (100) MgO (30 x 30 mm(2)) substrates buffered by CeO2/YSZ (Y2O3-stabilized ZrO2) double layers. The use of the double buffe r layers and the employment of a new technique for controlling substrate te mperature greatly enhance not only the YBCO film quality, but also the repr oducibility of deposition. An excellent in-plane epitaxy was achieved with no evidence of misoriented grains in the YBCO/CeO2/YSZ/MgO structure. Good microwave properties were observed for YBCO films grown on buffered MgO com pared with those on bare MgO.