Abstract
The ab-plane reflectivity of La 1.89 Ca 1.11 Cu 2 O 6±δ single crystalsr whose properties change from semiconductor to superconductor under high-oxygen-pressure annealing, is measured between 250 and 20 000 cm -1 at room temperature. Although the annealing increases the oxygen content very slightly, the spectra change in the same way as seen in other cuprates with carrier doping: a charge-transfer peak disappears and low-energy excitation increases. We suggest the possibility that holes in the apex oxygen redistribute to the CuO 2 planes. Mid-infrared absorption is observed in all samples. Relation between the mid-infrared absorption and the influence of La and Ca disorder on the CuO 2 planes is also discussed
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