Elsevier

Infrared Physics

Volume 18, Issues 5–6, December 1978, Pages 877-881
Infrared Physics

Submillimetre spectroscopy of Pb1−xGexTe

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Abstract

We have performed reflectivity measurements on Pb1−xGexTe (0 ≤ x ≤ 0.013) epitaxial layers in the frequency range of 5–500 cm−1 and the temperature range of 10–300K. Depending on the composition, Pb1−xGexTe exhibits a phase transition (for x > 0.005: Tc > 0) from the cubic NaCl to a rhombohedral (arsenic-like) structure. This phase transition is investigated for the first time by using optical techniques (Fourier transform spectroscopy) for an observation of the dependence of the optical phonon mode frequencies on lattice temperature and composition.

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Work supported by “Fonds zur Förderung der wissenschaftlichen Forschung”, Austria.

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