Abstract
We have performed polarized reflection measurements on the (001) plane of various single domain crystals of Y 1− z Ca z Ba 2Cu 3O x with different Ca and oxygen content. Using the in-plane anisotropy of the optical properties, we could separate the contribution of the CuO layers and the CuO chains to the electronic transport properties. It was found that the additional carriers introduced as a result of the Ca doping only appear in the CuO layers, while the doping of the chains is even reduced because of an increase of oxygen vacancies with increasing Ca doping for samples with an oxygen content close to seven. The superconducting transition temperature T c could be correlated with the free carrier concentration in the CuO layers, indicating a comparable phenomenon of overdoping in the 1-2-3 compound as it has been found in other high T c cuprates.
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