Abstract
The lattice dielectric property and the band edge structure in Pb 1-xSn xTe are investigated by magnetoplasma reflection using a strip-line technique with several submillimeter laser lines, which are in the Reststrahlen region in the vicinity of the TO-phonon energy. The TO-phonon frequency, the dielectric constant and the effective mass in PbTe and Pb 0.7Sn 0.3Te at 4.2K are obtained. The additional new fine structure in PbTe is identified as a spin flip combined resonance from which we determine the effective g-value and its angular dependence.
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