Abstract
Low-field electroreflectance (ER) measurements are reported for ${\mathrm{Mn}}_{x}{\mathrm{Cd}}_{1\ensuremath{-}x}\mathrm{Se}$ ($0\ensuremath{\le}x\ensuremath{\le}0.42$) from 1.2 to 2.7 eV. Three different structures are observed in the ER spectra, corresponding to the transition from the crystal-field--- and spin-orbit---split valence bands to the conduction band. The dependence of the energy gap and crystal-field and spin-orbit splitting on the temperature and composition has been obtained from an analysis of the ER data. In the samples with higher Mn content, the high-energy ER structure, which may be due to the excitation of the Mn $3d$ states, is observed. The broadening parameter of the fundamental ER structure yields information about compositional homogeneity of the materials investigated.
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