%0 Journal Article
%K yttrium compounds
%K heterostructures
%K High temperature superconductors
%K Ceramic materials
%K Yttrium barium copper oxides
%K Oxide superconductors
%K Praseodymium Barium Copper Oxides
%K Microscopic Examination–Transmission Electron Microscopy
%K Praseodymium Compounds
%K AC Susceptibility
%A Ramamoorthy Ramesh
%A A Inam
%A D.L Hart
%A C.T Rogers
%B Physica C: Superconductivity and its applications
%D 1990
%G eng
%P 325-332
%R 10.1016/0921-4534(90)90331-8
%T Microstructure studies of a-axis oriented YBa2Cu3O7-x-PrBa2Cu3O7-y heterostructures
%V 170
%X We have studied the microstructure of epitaxial a,b-axis oriented YBCO-PrBCO heterostructures using transmission electron microscopy. These films, grown on single crystal [001] SrTiO3 or LaAlO3 by pulsed laser deposition, have a Tc,0 of 84 K as determined by DC resistivity and AC susceptibility measurements. The PrBCO layer acts as a good buffer and template layer for the subsequent growth of a-axis oriented YBCO layer. Planar sections reveal the existence of two 90° rotated variants, with a small (<5%) fraction of c-axis oriented regions. These films are relatively free of polytypoidic defects, compared to c-axis oriented films. Selected area electron diffraction patterns obtained from cross sections and planar sections reveal the orientation relationship in which the a-axis of the YBCO layer and the b-axis of the PrBCO layer are normal to the substrate surface. © 1990.