Abstract
Behavior of PbTe samples doped with different amount of Cr, prepared by two methods of synthesis is analyzed using galvanomagnetic measurements and far-infrared spectroscopy. The far-infrared reflectivity spectra of PbTe(Cr) alloys were measured in the 50–650cm−1 spectral range at different temperatures and analyzed using a numerical fitting procedure based on the plasmon–phonon interaction model. The two local Cr modes at about 260cm−1 and 480cm−1 together with the strong plasmon–phonon coupling are observed. The persistent photoconductivity is registered. Using results of galvanomagnetic measurements the carrier concentrations is determined and hence we obtained the Fermi level temperature dependence.
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