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Percolation Behavior of the Normal-State Resistivity and Superconductivity of the YBa2Cu3O7−δ-Ba2GdNbO6 Composite System

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Abstract

The percolation behavior of the normal-state resistivity and superconductivity of the YBa2Cu3O7−δBa2GdNbO6 composite system were studied by X-ray diffraction and temperature-resistivity measurements. No detectable chemical reaction was observed between the YBa2Cu3O7−δ superconductor and the ceramic insulator Ba2GdNbO6, even after severe heat treatment above 950°C. The normal-state and superconducting percolation threshold values were found to be 17 vol.% and 30 vol.% of YBa2Cu3O7−δ respectively in the YBa2Cu3O7−δ-Ba2GdNbO6 composite system. The values obtained for the critical exponents describing the normal-state pecolation behavior of the system matched fairly well with the theoretically expected values for an ideal metal-insulator composite system.

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Authors and Affiliations

  1. Regional Research Laboratory (CSIR), Trivandrum, 695019, India

    J. Kurian, P. R. S. Wariar, P. K. Sajith & J. Koshy

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  1. J. Kurian
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  2. P. R. S. Wariar
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  3. P. K. Sajith
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  4. J. Koshy
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Kurian, J., Wariar, P.R.S., Sajith, P.K. et al. Percolation Behavior of the Normal-State Resistivity and Superconductivity of the YBa2Cu3O7−δ-Ba2GdNbO6 Composite System. Journal of Superconductivity 11, 683–687 (1998). https://doi.org/10.1023/A:1022624619493

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