%0 Journal Article
%A A Inam
%A C.T Rogers
%A Ramamoorthy Ramesh
%A K Remschnig
%A L Farrow
%A D Hart
%A T Venkatesan
%A B Wilkens
%B Applied Physics Letters
%D 1990
%G eng
%P 2484-2486
%R 10.1063/1.104179
%T a-axis oriented epitaxial YBa2Cu3O 7-x-PrBa2Cu3O7-y heterostructures
%V 57
%X We have grown YBa2Cu3O7-x-PrBa 2Cu3O7-y heterostructures with the perovskite a axis normal to the surface of a variety of (001) oriented substrates using the pulsed laser deposition technique. X-ray diffraction studies indicate little or no formation of the traditional c-axis normal orientation usually nucleated on these substrates, while ion channeling, transmission electron microscopy (TEM), and Raman scattering studies reveal a highly ordered crystalline structure similar in quality to that obtained in the best c-axis oriented films. Superconducting transition temperatures, for current transport in the plane of the films, consistently exceed 80 K, but are probably lower than the optimum 92 K transition expected for YBa2Cu3O7-x due to the presence of growth twin boundaries between grains with the c axis oriented along the two substrate directions.