Effects of the initial heat-treatment conditions on microstructures of YbBa2Cu3O7-δ superconducting final films deposited on SrTiO3(001) substrates by the dipping-pyrolysis process

Junko Shibata, Katsuya Yamagiwa, Izumi Hirabayashi, M. A. Xiuliang, Jun Yuan, Tsukasa Hirayama, Yuichi Ikuhara

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    13 Citations (Scopus)

    Abstract

    We investigated by transmission electron microscopy the relationship between the initial heat-treatment conditions and the microstructures of YbBa2Cu3O7-δ superconducting final films deposited by a dipping-pyrolysis process on SrTiO3(001) single crystal substrates. An amorphous precursor film was prepared by heating rapidly up to 425°C. By heat-treating at 725C, this film became a c-axis oriented YbBa2Cu3O7-δ film with a thickness of 100 nm, and showed a sharp resistive transition around the critical temperature (Tc). On the other hand, a polycrystalline precursor film was produced by heating slowly. This film did not give rise to an epitaxial film, but to a YbBa2Cu3O7-δ polycrystalline film with a grain size of about 200 nm, and exhibited a broad transition. Therefore, the initial heat-treatment conditions and the microstructures of the precursor films arc important for the epitaxial growth and superconducting properties of the final YbBa2Cu3O7-δ films.

    Original languageEnglish
    Pages (from-to)5050-5053
    Number of pages4
    JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
    Volume38
    Issue number9 A
    DOIs
    Publication statusPublished - 1999

    Keywords

    • Amorphous film
    • Dipping-pyrolysis process
    • Epitaxial growth
    • Transmission electron microscopy
    • Ybbacuo film

    ASJC Scopus subject areas

    • Engineering(all)
    • Physics and Astronomy(all)

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