Abstract
We present far-infrared reflectivity spectra of Pb 0.75Sn 0.25 Te single crystals doped with 0.5 at% of indium. The experimental spectra are analysed using a numerical fitting procedure based on the plasmon-phonon interaction model. The plasma frequency is found to decrease on cooling from 300 to 30 K and a sharp drop in ω itp was observed between 30 K and 5 K. If the free carrier distribution over sample thickness is taken into account, experimental and calculated spectra agree well over the above temperature range. The results of galvanomagnetic measurements are also presented.
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