Local and Quasi‐Local Modes of Fe and Zn in CdTe

Abstract

Abstract The far infrared absorption and reflection spectra of the mixed crystals Cd 1− x Fe x Te and Cd 1− x . Zn x Te with small x in the temperature range of 4.2 to 300 K and the wavenumber range of 20 to 350 cm −1 are reported. Local modes induced by Fe and Zn (196 and 173 cm −1 ), quasi‐local modes induced by FeTe and ZnTe (56 and 54 cm −1 ) in CdTe and CdTe‐like 2TA two‐phonon absorption (72 cm −1 ) are observed and estimated by use of the Green's function method. The random‐ element‐isodisplacement (REI) model is also used to calculate the two‐mode‐behaviors of the mixed crystals and to best fit the reflection spectra. Besides, the temperature dependences of the phonon absorptions are calculated and well explained.