MICROSTRUCTURES OF YBA2CU3O7-X SUPERCONDUCTING THIN-FILMS GROWN ON A SRTIO3(100) SUBSTRATE

[[abstract]]We report microstructures of superconducting YBa2Cu3O7−x thin films epitaxially grown on a SrTiO3(100) substrate. Transmission electron microscopy studies reveal epitaxial, highly ordered grains ∼5000 Å in size for both types of films with either the a or c axis perpendicular to the film. Defects due to out‐of‐phase boundaries are observed in the former case. The high density of twin boundaries found in the latter case seems to correlate with the higher Jc observed in thin‐film samples.[[fileno]]2010113010060[[department]]物理