Heteroepitaxy of high-Tc superconducting TlBaCaCuO films on metal-coated substrates

D. L. Schulz, D. S. Richeson, G. Malandrino, D. Neumayer, T. J. Marks, D. C. DeGroot, J. L. Schindler, T. Hogan, C. R. Kannewurf

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11 Citations (Scopus)

Abstract

Superconducting TlBaCaCuO thin films have been successfully grown on gold-coated oxide substrates (yttria-stabilized zirconia (YSZ)) using a combination of metal-to-organic chemical vapor deposition (MOCVD) and Tl vapor diffusion. BaCaCuO films are first prepared by MOCVD using "second-generation" precursors with improved thermal stability and volatility. Thallium is then incorporated into these films by annealing in the presence of a mixture of oxides (Tl2O3, BaO, CaO and CuO) of a specific composition. The resultant films consists predominantly of single-phase Tl2Ba2CaCu2Ox superconductor with preferential orientation of the crystallite c-axes perpendicular to the substrate surface. A magnetically determined Tc value of about 95 K for Tl2Ba2CaCu2Ox on Au/YSZ compares well with a transport Tc value of 94 K. Attempts to form superconductors on platinum-coated oxide substrates (MgO) led to the formation of a PtTlO phase.

Original languageEnglish
Pages (from-to)45-48
Number of pages4
JournalThin Solid Films
Volume216
Issue number1
DOIs
Publication statusPublished - Aug 28 1992

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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