Thin films of (001) YBCO are grown on epitaxially polished (001) MgO by pulsed organometallic beam epitaxy. The in-plane orientation of the film is controlled by the thickness of a BaO layer, grown in situ, prior to the YBCO growth. For thin BaO layers (<≊7×1014 Ba/cm2) the films grown YBCO∥MgO. For thick BaO layers (≳≊11×1014 Ba/cm2) the films grow YBCO∥MgO. A mechanism that relates the change in YBCO in-plane orientation to a change in the structure of the initial BaO layers with BaO thickness is described.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)