Abstract

We have performed reflectance measurements on the (001) surfaces of twinned single crystals of NdBa 2Cu 3O x . The oxygen concentration x was varied between 6 ≤ x ≤ 7. The results were compared to former investigations on YBa 2Cu 3O x . The different dependence of the electronic transport properties on the oxygen content of both compounds can be explained by the different distributions of oxygen amongst the CuO chains.

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