Abstract
The CdGa2Se4 compound, with a crystalline lattice of defect chalcopyrite, shows birefringence. However, in contrast to the similar CdGa2S4 compound, CdGa2Se4 has no experimentally observed isotropic points in the optical spectral range. In this study, the electron energy structure and optical spectra of CdGa2Se4 are calculated for three different experimentally obtained sets of crystalline parameters. Only one of these sets shows the absence of isotropic points.
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