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Abstract
Absorption curves of CuPbAsS3 have been measured in the temperature range 90÷300 K. Their analysis leads to conclusion that the absorption edge of CuPbAsS3 is due to allowed indirect electronic transitions between the valence and conduction band extrema. The forbidden-gap width, its temperature dependence and energies of three interacting phonons have been determined. The temperature shift of the photoconductivity band is in agreement with that of the forbidden gap in CuPbAsS3.
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