Abstract
The specific features of the properties of Hg-Te lattice vibrations have been considered within the percolation model of a mixed Cd1–y Hg y Te crystal (alloy), in which the composite medium is formed by the alloy regions enriched in HgTe and CdTe with different Hg-Te vibrational states and, hence, with different characteristics of vibrational modes (frequency and damping parameter). In the HgTe-enriched alloy, the properties of Hg-Te lattice vibrations are determined by a double-well lattice potential for the Hg atom with the off-center localization at low temperatures. In the CdTe-enriched alloys, the properties of Hg-Te lattice vibrations are determined by a single-well lattice potential for the Hg atom in the center of the anion tetrahedron, and the Hg-Te vibrational states are localized. For the HgTe-enriched alloy, the Hg-Te vibrational states are extended. In the percolation scheme of the transformation of the vibrational spectrum of the Cd1 - y Hg y Te alloy with the composition y, the “137 cm−1” mode is a split-off mode of Hg-Te vibrations, or one of the modes of the percolation doublet of HgTe-like vibrations.
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Original Russian Text © S.P. Kozyrev, 2015, published in Fizika Tverdogo Tela, 2015, Vol. 57, No. 9, pp. 1790–1797.
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Kozyrev, S.P. Specific features of the properties of lattice vibrations in the Cd1–y Hg y Te alloy formed by the CdTe semiconductor and the HgTe semimetal. Phys. Solid State 57, 1837–1845 (2015). https://doi.org/10.1134/S1063783415090206
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DOI: https://doi.org/10.1134/S1063783415090206