Raman scattering from cupric oxide

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Abstract

Raman scattering experiments have been carried out on Cupric Oxide (CuO) throughout the temperature range from 15K to 300K. The three Raman active modes predicted by group theory have been identified and their room temperature frequencies determined to be 298, 345 and 632 cm−1. A new mode appears in the spectra (240 cm−1 at 15K) as the sample is cooled below the Néel Temperature (TN = 225± 5K of CuO. Based upon its temperature dependence this mode is tentatively assigned to scattering from a low-lying electronic excitation. Another mode (218 cm−1 at 300K) softens and disappears on cooling the sample below 200K. The results are discussed in terms of data obtained from recent neutron and Mossbauer studies on CuO.

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