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Transport and optical properties of PbTe 1− x S x ( x = 0.02 and x = 0.05) mixed crystals
Author(s) -
Miljković J. M.,
Romčević N.,
Popovic Z. V.,
Köunig W.,
Nikiforov V. N.
Publication year - 1996
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221930105
Subject(s) - phonon , raman scattering , far infrared , raman spectroscopy , condensed matter physics , infrared , materials science , phase transition , scattering , wavelength , plasmon , phase (matter) , optics , chemistry , physics , optoelectronics , organic chemistry
Far‐infrared and Raman scattering spectra as well as galvanomagnetic measurements of PbTe 1− x S x ( 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.