Thin Films of YBaCuO Prepared by Multilayer Evaporation Process

  • X. K. Wang
  • D. X. Li
  • J. Q. Zheng
  • J. B. Ketterson
  • R. P. H. Chang
Chapter

Abstract

Thin films of YBaCuO were prepared as a superlattice of three constituents from three electron guns using a computer-controlled evaporator. After annealing, the multilayer films are converted to the homogeneous superconducting phase. Highly epitaxial thin films with: (1) the a-axis perpendicular to (100) SrTiO3; (2) the c-axis perpendicular to (100) SrTiO3; and (3) the [110] axis perpendicular to (110) SrTiO3 were confirmed by x-ray diffraction as well as scanning electron microscopy and high resolution electron microscopy. Both the a-axis oriented and the c-axis oriented films exhibit zero resistance at 91K. The [110] oriented film shows the sharpest transition with a transition width of 1K and zero resistance at 85K. The zero field critical current density, Jc, determined magnetically, is in excess of 107A/cm2 at 4.4K and 1.04 x 106A/cm2 at 77K for the c-axis oriented film; for the a-axis oriented film we obtained 6.7 x 106A/cm2 at 4.4K and 1.2 x 105A/cm2 at 77K. The orientation dependence of the critical current density in the basal plane of the a-axis oriented film was studied. The largest Jc’s occur along the in-plane <100> axes of the substrate.

Keywords

Scanning Electron Microscopy Micrograph Critical Current Density Multilayer Film High Resolution Electron Microscopy Epitaxial Thin Film 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Elsevier Science Publishers Ltd. 1990

Authors and Affiliations

  • X. K. Wang
    • 1
  • D. X. Li
    • 1
  • J. Q. Zheng
    • 1
  • J. B. Ketterson
    • 1
  • R. P. H. Chang
    • 1
  1. 1.Materials Research Center and Science & Technology Center for SuperconductivityNorthwestern UniversityEvanstonUSA

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