Abstract
The percolation behavior of normal‐state thermopower, resistivity, and superconductivity have been studied in YBa2Cu3O7‐δ─Ag (YBCO─Ag) composite systems. The normal‐state resistivity and thermopower show a percolation threshold at a Ag volume fraction (VAg) of 20% to 30%, whereas the superconducting network shows a threshold at a VAg of ≅70% to 80%. The results obtained from this study show that the YBCO─Ag composite obtained from Ag2O and YBCO powders is uniformly distributed with Ag and YBCO remaining as separate phases without changing their characteristics. The measurements of thermopower indicate that the normal‐state thermopower and phonon‐drag thermopower are affected by the Ag addition. The stability of YBCO is increased when it is in composite form.
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