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The effects of short-range order and natural microinhomogeneities on the FIR optical properties of CdxHg1−xTe

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Abstract

Possible types and formation mechanisms for the correlated cation distributions in CdxHg1−xTe alloys, including short-range order (SRO) in the mixed sublattice and composition microinhomogeneities (MI), are discussed. The impact of SRO (ordering or clustering) on phonons is studied in the framework of the coherent potential approximation. It is shown that two peaks of the spectral density of phonon states with \(\overrightarrow q \)=0 (HgTe-like and CdTe-like modes) move toward and away from their positions in end member crystals due to clustering and ordering, respectively. Short-range ordering also activates (HgTe-like and CdTe-like states of the Brillouin zone edge, but this effect is small. The effects of composition MI on the dielectric response due to phonons are considered and an effective dielectric function is calculated using the modified Maxwell-Garnett approach. It is shown that separate inclusions of different composition produce extra modes of the Fröhlich type in FIR spectra of CdxHg1−x Te. It is argued that this is a more plausible explanation of the experimenatally observed ‘cluster’ mode (133 cm−1 in Raman and 135 cm−1 in FIR spectra) than one which previously appeared in the literature and involves atomic ordering in the mixed sublattice.

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Authors and Affiliations

  1. Departamento de Física, Universidade do Minho, Largo do Paço, 4709, Braga Codex, Portugal

    M. I. Vasilevskiy & M. J. M. Gomes

  2. Faculty of Physics, Nizhni Novgorod University, 603600, Nizhni Novgorod, Russia

    M. I. Vasilevskiy

  3. GIREDMET Institute, 109017, Moscow, Russia

    A. I. Belogorokhov

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  1. M. I. Vasilevskiy
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  2. A. I. Belogorokhov
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  3. M. J. M. Gomes
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Vasilevskiy, M.I., Belogorokhov, A.I. & Gomes, M.J.M. The effects of short-range order and natural microinhomogeneities on the FIR optical properties of CdxHg1−xTe. J. Electron. Mater. 28, 654–661 (1999). https://doi.org/10.1007/s11664-999-0049-3

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  • DOI: https://doi.org/10.1007/s11664-999-0049-3

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