Abstract
Impurity-induced modes at 212 and 535 cm−1 have been studied by using Raman scattering spectroscopy in Be-doped cubic boron nitride single crystals, which have been grown by the temperature-gradient method under high pressure. Those bands show prominent polarization properties of T2 and A1 modes for the 212 and 535 cm−1 bands, respectively. Based on the polarization properties and a simple calculation of a molecular model, the origin of the bands is explained by postulating resonance modes of substitutional Be with a weak force constant between the host atoms and the Be. Anomalies of a forbidden transverse optical mode and the T2 mode due to phonon–plasma coupling caused by photoexcited free carriers have been also observed in high excitation density.
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