Abstract
Raman scattering experiments have been carried out on powdered samples of cupric oxide (CuO) grown with the 18O isotope. The phonon frequencies have been measured and compared to those of Cu16O. The isotopic frequency shifts of the phonon modes have also been compared with the predictions of a lattice dynamics model. Previous low temperature experiments on Cu16O revealed a mode at 240 cm-1 that was attributed to a magnetic excitation. The present results are consistent with this interpretation in that the same mode is observed to be unshifted in the spectra from Cu18O at low temperatures. A broad peak is also observed in the low temperature spectra at higher energies. This feature has a maximum at about 2100 cm-1, is believed to arise from electronic scattering and is perhaps, at least in part, due to two-magnon scattering.
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