Resonant Raman studies of structural ordering in Hg1−xCdxTe: Dependence on growth conditions

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Abstract
Resonant Raman scattering with photon energies between 2.35 and 2.7 eV has been used to study both the alloy composition and local structural order in Hg1−xCdxTe for x values near 0.25 and for samples prepared by bulk growth, liquid phase epitaxy, molecular beam epitaxy, and metalorganic chemical vapor deposition. The resonance behavior of the HgTe‐like transverse optical and longitudinal optical (LO) modes, the CdTe‐like LO mode, and that of an additional mode probably due to preferential clustering of three Hg and one Cd about the Te sites, all indicate strong enhancement at the E1 edge. However, surfaces annealed with a Nd:yttrium‐aluminum‐garnet‐pumped dye laser show strong suppression of the cluster mode (but not the LO mode) in all samples, which suggests that extremely rapid epitaxial regrowth may inhibit the 3:1 cluster formation.