ISSN:
1572-9605
Keywords:
High-Tc superconductor
;
chain conduction
;
thermopower
;
chemical stability
Source:
Springer Online Journal Archives 1860-2000
Topics:
Electrical Engineering, Measurement and Control Technology
,
Physics
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00727461
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