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Deposition of Superconducting Tl-Ba-Ca-Cu-O Phases on Metal Foils by Metal-Organic Chemical Vapor Deposition

  • D. L. Schulzi (a1), B. Hano (a1), D. Neumayer (a1), B. J. Hinds (a1), T. J. Markst (a1), D. C. Degroot (a2), J. L. Schindler (a2), T. Hogan (a2) and C. R. Kannewurf (a2)...

Abstract

The synthesis of superconducting Tl-Ba-Ca-Cu-O thin films on metal foils (Au and Ag) by metal-organic chemical vapor deposition (MOCVD) has been investigated. Ba-Ca-Cu-O-(F) films are first prepared via MOCVD using fluorinated “second generation” metal-organic precursors. After an intermediate anneal with water vapor-saturated oxygen to promote removal of F, Tl is introduced by annealing in the presence of a mixture of oxides (Tl2O3, BaO, CaO, CuO) of a specific composition. Characterization of the thin films by scanning electron microscopy, EDX, x-ray diffraction, and variable temperature magnetization measurements has been carried out. High temperature superconductor (HTS) films of Tl2Ba2Ca1Cu2O8−x on Au foil exhibit a magnetically derived Tc = 80K and a high degree of texturing with the crystallite c-axes oriented perpendicular to the substrate surface as evidenced by enhanced (000 x-ray diffraction reflections. Thin film coverage on Ag foil becomes non-contiguous during the (Tl2O3, BaO, CaO, CuO) mixture anneal.

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References

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Deposition of Superconducting Tl-Ba-Ca-Cu-O Phases on Metal Foils by Metal-Organic Chemical Vapor Deposition

  • D. L. Schulzi (a1), B. Hano (a1), D. Neumayer (a1), B. J. Hinds (a1), T. J. Markst (a1), D. C. Degroot (a2), J. L. Schindler (a2), T. Hogan (a2) and C. R. Kannewurf (a2)...

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