Reflectance of a PbSb2Te4 crystal in a wide spectral range
- Authors: Nemov S.A.1,2, Ulashkevich Y.V.3, Povolotskii A.V.4, Khlamov I.I.1
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Affiliations:
- St. Petersburg Polytechnic University
- Transbaikal State University
- Ioffe Physical–Technical Institute
- St. Petersburg State University
- Issue: Vol 50, No 10 (2016)
- Pages: 1322-1326
- Section: Spectroscopy, Interaction with Radiation
- URL: https://journals.rcsi.science/1063-7826/article/view/198035
- DOI: https://doi.org/10.1134/S1063782616100183
- ID: 198035
Cite item
Abstract
For the anisotropic PbSb2Te4 single crystal with a high hole concentration (p ≈ 3 × 1020 cm–3) and high conductivity (σ ≈ 2500 Ω–1 cm–1), the reflectance spectrum for a cleavage plane orthogonal to the trigonal axis C3 is recorded in a wide spectral range from 50 to 50000 cm–1. It is shown that, in the long-wavelength and mid-infrared regions, the reflectance can be described with consideration for the contribution of plasma vibrations and two crystal-lattice vibrations. The quantitative characteristics of these vibrations are determined. The characteristics are in satisfactory agreement with the electrical parameters. The discrepancies between the values of the hole effective mass calculated by different methods are attributed to the complex structure of the crystal’s valence band.
About the authors
S. A. Nemov
St. Petersburg Polytechnic University; Transbaikal State University
Author for correspondence.
Email: nemov_s@mail.ru
Russian Federation, St. Petersburg, 195251; Chita, 672039
Yu. V. Ulashkevich
Ioffe Physical–Technical Institute
Email: nemov_s@mail.ru
Russian Federation, St Petersburg, 194021
A. V. Povolotskii
St. Petersburg State University
Email: nemov_s@mail.ru
Russian Federation, St. Petersburg, 199034
I. I. Khlamov
St. Petersburg Polytechnic University
Email: nemov_s@mail.ru
Russian Federation, St. Petersburg, 195251