Raman spectra of cubicZn1−xCdxS

We report Raman spectra of cubic ${\mathrm{Zn}}_{1\mathrm{-}\mathit{x}}$ ${\mathrm{Cd}}_{\mathit{x}}$S grown by metalorganic vapor-phase epitaxy and metalorganic molecular-beam epitaxy on (001) GaAs substrates. Two longitudinal-optical (LO) modes and one transverse-optical mode are observed, and their behavior is similar to that of the one-mode type. However, the signal intensity of the lower-frequency LO phonon is strong compared with that in hexagonal ${\mathrm{Zn}}_{1\mathrm{-}\mathit{x}}$ ${\mathrm{Cd}}_{\mathit{x}}$S, which exhibits a typical one-mode behavior. We also observe two additional peaks that are tentatively attributed to disorder-activated modes.