Abstract
In this communication, we present IR-excited Raman scattering of single crystals of PrBa 2Cu 3O 7−y. In contrast with Raman scattering excited in the visible, we find the presence of two different Raman modes with energy around 500 cm −1. Comparison with visible excitation and with the band associated with the apex oxygen local modes in low-oxygen Pr xY 1−xBa 2Cu 3O 6+y indicates that there are two separate vibrational modes associated with the apex oxygen position in the high oxygen phase of PrBa 2Cu 3O 7−y. We interpret this as due to the existence of two different sites for apex oxygen atoms and in terms of polaronic states in the chain sites.
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