Transport and optical properties of PbTe1-xSx (x=0.02 and x=0.05) mixed crystalsстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Far-infrared and Raman scattering spectra as well as galvanomagnetic measurements of PbTe1−xSx (x = 0.02 and 0.05) mixed crystals in the temperature range from 10 to 300 K are presented. The far-infrared reflectivity spectra are analysed using a fitting procedure based on the plasmon-phonon interaction model. Galvanomagnetic and far-infrared measurements indicate the existence of a phase transition at about Tc = 60 K for x = 0.05, whereas for samples with x = 0.02 the phase transition is not observed. Also, it is found that the long-wavelength optical phonon modes of these mixed crystals show a “two-mode” behaviour.