Abstract
The impurity photoconductivity (PC) spectra as well as the electrical properties of Pb1−x−yGexSnyTe (In-doped) mixed crystals (x ≦ 0.16, y ≦ 0.25, NIn = (0.17 to 2) at%) are studied. The PC spectra have a complicated structure and consist of four bands. The edge energy of positive PC exceeds significantly the energy separation between the Fermi level and the conduction band. A narrow band is observed in the PC spectra, which is attributed to interimpurity transitions; the position of this band depends strongly on the rhombohedral lattice distortion below Tc. The negative-U model of In centers is shown to be adequate to experimental results. The energy spectrum of a pair of In atoms is calculated and the characteristic energies |U| and W involved are obtained. [Russian Text Ignored].
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