Raman spectra of single crystal CuO

Abstract

Polarized Raman measurements on single crystals of CuO yield the symmetry assignments of the three predicted Raman active lattice modes : 297cm −1 (A g, 344cm −1 (B g) and 629cm −1 (B g). These results are compared to literature data, including IR spectra. Our measurements confirm at low temperature the appearance of an additional Raman band around 240 cm −1. The temperature dependence of the linewidth of the A g mode presents an anomalous behavior near the magnetic phase transition, suggesting the possible presence of magnon-phonon couplings in the antiferromagnetic phase.