This article is cited in 4 papers

Electronic properties of semiconductors

Dispersion of the refractive index of epitaxial Pb$_{1-x}$Eu$_x$Te (0 $\le x\le$ 1) alloy layers below the absorption edge

D. A. Pashkeev^a, Yu. G. Selivanov^a, E. G. Chizhevskii^a, D. B. Stavrovskiĭ^b, I. I. Zasavitskii<sup>a

a</sup> P. N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow
^b Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow

Abstract: The transmittance spectra of epitaxial Pb$_{1-x}$Eu$_x$Te (0 $\le x\le$ 1) alloy layers are exploited to study the dispersion of their refractive index in the spectral range from 650 to 8000 cm$^{-1}$ (below the absorption edge). The refractive index and the position of the absorption edge as functions of the composition parameter of the alloys are determined at two temperatures, 80 and 295 K. The refractive index is calculated in the context of the classic wave concepts of propagation of electromagnetic radiation. The experimentally determined dispersion dependences are described by the empiric Sellmeier expression of the second order. From analysis of the transmittance of the layers, it follows that the band gap of the epitaxial Pb$_{1-x}$Eu$_x$Te alloys increases with increasing temperature at $x <$ 0.5 and decreases at $x >$ 0.5.

Received: 19.01.2011
Accepted: 26.01.2011

 English version: Semiconductors, 2011, 45:8, 980–987

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