Abstract
The a- b plane optical conductivity of three, semiconducting, Nd 2− x Ce x CuO 4± y single crystals with different values of x and y has been measured between 70 and 18000 cm −1 and between 300 and 20 K. In all samples, a polaron peak is observed at room temperature at ∼ 1000 cm −1. As T decreases, the peak remains at the same energy in two low-doping samples with different chemical compositions, while in the most strongly electron-doped crystal it moves to the far-infrared due to a transfer of spectral weight within the polaron band. This unexpected behavior indicates a delocalization of the polaron in this cuprate, which could provide coherent transport at low temperature.
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