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Josephson transport in Tl-cuprate bicrystal weak links

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Abstract

Superconducting epitaxial Tl2Ba2CaCu2O8 (Tl-2212) and Tl2Ba2CuO6, (Tl-2201) thin films are synthesised on single crystal and bicrystal LaAlO3 substrates by an ex-situ process. Tl-2212 films were optically smooth, with Tc′s from 105 to 108K and ΔTc <2K, Jc reaching 2·106A/cm2 at 77K. Tl-2201 films exhibited tetragonal or orthorhombic symmetry depending on the thallium content. The Tc of the as-synthesised Tl-2201 films was in the range 40–55K. By oxygen depletion, Tc was increased by 15 – 20 K. Properties of weak links in Tl-2212 and Tl-2201 thin films are reported.

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Authors and Affiliations

  1. Dept. of Inorganic Chemistry, University of Göteborg and Chalmers University of Technology, S-412 96, Göteborg, Sweden

    Q. -H. Hu, L. -G. Johansson & V. Langer

  2. National Laboratory for Superconductors. Inst. of Physics, Chinese Acad. of Sciences, 100080, Beijing, Peoples Rep. of China

    Y. F. Chen

  3. Dept. of Physics, Chalmers University of Technology and University of Göteborg, S-412 96, Göteborg, Sweden

    T. Claeson & Z. G. Ivanov

  4. Institute of Crystallography, Russian academy of Sciences, 117333, Moscow, Russia

    Yu. Kislinski & E. A. Stepantsov

Authors
  1. Q. -H. Hu
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  2. L. -G. Johansson
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  3. V. Langer
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  4. Y. F. Chen
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  5. T. Claeson
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  6. Z. G. Ivanov
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  7. Yu. Kislinski
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  8. E. A. Stepantsov
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Hu, Q.H., Johansson, L.G., Langer, V. et al. Josephson transport in Tl-cuprate bicrystal weak links. J Low Temp Phys 105, 1261–1266 (1996). https://doi.org/10.1007/BF00753873

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  • DOI: https://doi.org/10.1007/BF00753873

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