ACOUSTIC LOCAL MODE AND TA BAND MODE VIBRATION FOR THE MIXED CRYSTALS Cd_1-xMn_xTe

We report here the acoustic local mode and TA band mode for the lattice vibration of the mixed crystals Cd_1-xMn_xTe as observed by very far infrared spectra. The occurence of the acoustic local mode and the weakly optical activity of TA mode induced by crystalline-mixing are discussed in light of the defect lattice dynamics.