Microstructures of YBa2Cu3O7-x superconducting thin films grown on a SrTiO3(100) substrate

Chen, C. H.; Kwo, J.; Hong, M.
March 1988
Applied Physics Letters;3/7/1988, Vol. 52 Issue 10, p841
Academic Journal
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.


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