@article{34000, author = {D.M Hwang and Ramamoorthy Ramesh and C.Y Chen and X.D Wu and A Inam and M.S Hegde and B Wilkens and C.C Chang and L Nazar and T Venkatesan and S Miura and S Matsubara and Y Miyasaka and N Shohata}, title = {Epitaxial relations between in situ superconducting YBa2Cu 3O7-x thin films and BaTiO3/MgAl 2O4/Si substrates}, abstract = {In situ superconducting YBa2Cu3O7-x films with Tc0 up to 87 K and Jc, 77 K up to 6×10 4 A/cm2 were prepared on Si substrates with MgAl 2O4 and BaTiO3 double-buffer layers. The epitaxial relations between various layers were established by transmission electron microscopy. The MgAl2O4 layer is heavily faulted. The subsequent BaTiO3 layer stops most of the faults, provides a template for the YBa2Cu3O7-x growth, and partially screens off the stress due to different thermal expansion coefficients. The microstructure of the YBa2Cu3O 7-x layer is very similar to that of the films deposited directly on SrTiO3, exhibiting a homogeneous heavily faulted single-crystal-like structure free from secondary phases and grain boundaries. The slight degradation of the transport properties is attributed to residual thermal stress.}, year = {1990}, journal = {Journal of Applied Physics}, volume = {68}, number = {4}, pages = {1772-1776}, issn = {00218979}, doi = {10.1063/1.346607}, note = {cited By 16}, language = {eng}, }