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Superconductivity and Electrical Transport in YBa2Cu3O7-δ-PrBa2SnO5.5 Percolation System

Percolation behaviour of the normal state resistivity and superconductivity of YBa2Cu3O7-δ-PrBa2SnO5.5 composites have been studied by X-ray diffraction and temperature-resistivity measurements. No detectable chemical reactivity was observed between YBa2Cu3O7-δ and a ceramic insulator PrBa2SnO5.5 even when the two materials were mixed thoroughly and sintered at 1020° C. The normal state percolation threshold is 21 vol% of YBa2Cu3O7-δ and the superconducting percolation threshold is 30 vol% of YBa2Cu3O7-δ in the composite. The values obtained for the critical exponents describing the normal state transport behaviour of the system matched with theoretically expected values for an ideal conductor-insulator system. The implications are discussed.