DISORDER-INDUCED RAMAN-SCATTERING IN MGXZN1-XTE MIXED-CRYSTALS

The phonon spectra of the mixed crystal MgXZn1-XTe (0 less than or equ al to X less than or equal to 0.48) in the zinc-blende phase are inves tigated by Raman scattering. The phonon frequencies exhibit a dependen ce on the Mg concentration. The disorder induced one-phonon and two-ph onon modes are present in the Raman spectra for X greater than or equa l to 0.16. The Raman intensity ratio between first-order and second-or der phonon modes was a good indicator to characterize the degree of di sorder in the mixed crystals. (C) 1998 Published by Elsevier Science L td.