Abstract
The metallic conductivity of both the CuO2 sheets and the CuOx chains of YBa2Cu3O7−δ has been established. We have used double doping in (Y1−xCax)(Ba2−xLax)Cu3O7−δ to destroy the integrity of the CuO1−δ chains while keeping constant the total oxidation state of the Cu-O array. A break-up of the chain segments allows us to establish the temperature dependence of the Seebeck coefficient, α(T), due to the CuO2 sheets and, by difference, that of the CuO1−δ chains in YBa2Cu3O7−δ. We also show that double doping enhances significantly the chemical stability of the superconductive phase. The origin of the chemical stability and of the behavior of α(T) is interpreted.
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Zhou, J.P., Zhou, J.S., Goodenoug, J.B. et al. Physical and chemical properties of (Y1−xCax)(Ba2−xLax)Cu3O7−δ. J Supercond 8, 651–652 (1995). https://doi.org/10.1007/BF00727461
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DOI: https://doi.org/10.1007/BF00727461