Disorder-induced Raman scattering in MgXZn1-XTe mixed crystals

The phonon spectra of the mixed crystal MgXZn1-XTe (0 less than or equal to X less than or equal to 0.48) in the zinc-blende phase are investigated by Raman scattering. The phonon frequencies exhibit a dependence on the Mg concentration. The disorder induced one-phonon and two-phonon modes are present in the Raman spectra for X greater than or equal to 0.16. The Raman intensity ratio between first-order and second-order phonon modes was a good indicator to characterize the degree of disorder in the mixed crystals. (C) 1998 Published by Elsevier Science Ltd.