Abstract
Growing superconducting films of the high-temperature superconductors (HTS) in a single-step process within the vacuum system and at lower temperatures than post-annealed films has been the goal of many researchers. This has been achieved in YBa2Cu3O7 at a number of laboratories, but Bi and Tl-based HTS have proven more difficult. We report superconducting films of Bi2Sr2CaCu2Ox and Bi2Sr2Ca2Cu3Ox made by magnetron sputtering from a bismuth enriched composite target, onto MgO at substrate temperatures ≈150°C lower than required for post-annealed films. These films show highly c-axis oriented growth without the need for epitaxy, which suggests that films might be grown on a variety of substrates both with and without a buffer layer. The exact mechanism of crystallization at such low temperatures is not yet known, but it can be speculated that the surface atoms are less constrained and thus have a smaller energy barrier to overcome in forming a crystal structure. There is a narrow temperature window for growth of the superconducting phase; at lower temperatures the films tend to be semiconducting, due probably to lack of sufficient thermal energy to crystallize a well-ordered phase. At higher temperatures the bismuth sticking coefficient decreases to the point where no bismuth remains and the films are insulating.
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Superconductive Components, Inc. Columbus, OH.
Single crystal supplied by D. Shi, Materials Science Division, Argonne National Laboratory.
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© 1990 Plenum Press, New York
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Kampwirth, R.T. et al. (1990). In-Situ Growth of Superconducting Films of Bi-Sr-Ca-Cu-O Using Magnetron Sputtering. In: McConnell, R.D., Noufi, R. (eds) Science and Technology of Thin Film Superconductors 2. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-1345-8_5
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DOI: https://doi.org/10.1007/978-1-4684-1345-8_5
Publisher Name: Springer, Boston, MA
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