Options
1988
Journal Article
Titel
Composition dependence of longitudinal optical phonon modes in Cd(x)Hg(1-x)Te with 0.5 equal or smaller than x equal or smaller than 1
Alternative
Abhängigkeit longitudinal optischer Schwingungsmethoden von der Zusammensetzung in Cd(x)Hg(1-x)Te mit 0.5 kleiner gleich x kleiner gleich 1
Abstract
Using Raman scattering, we have studied the composition dependence of the CdTe-like longitudinal optical (LO) phonon mode in Cd(x)Hg(1-x)Te with 0.5 equal or smaller than x equal or smaller than 1. For excitation with photon energies close to the Epsilon(O)+Delta(O) gap energy, a resonance enhancement was found at 77 K for dipole-forbidden Fröhlich-induced one-LO-phonon and Fröhlich-induced two-LO-phonon scattering over the whole composition range. Taking advantage of this enhancement we determined the one-LO-phonon and two-LO-phonon frequencies and found a frequency shift linear with x. This shift is consistent with a linear composition dependence of the CdTe-like LO mode over the whole range from CdTe to HgTe. (IAF)