Abstract
The optical-phonon spectra of CdGeAs2 were investigated by low temperature polarized Raman scattering. According to vibrational modes of ZnS-type materials and selection rules of Raman scattering, all Raman active vibrational modes in the Brillouin-zone (BZ) center of CdGeAs2 predicted from group-theory arguments were identified and artificially grouped in three energy bands, including 45–94, 158–215 and around 260cm−1. Based on the Lyddane-Sachs-Teller (LST) relation and measured refractive indices, the low-frequency dielectric constant ε(0) is estimated to be 15.04 and shows good agreement with the previous tests and predictions.
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