The doping of A^IVB^VI semiconducting compounds with transition metal impurities has significant scientific and practical interest. Lead telluride (PbTe) belongs to the A^IVB^VI IR-sensitive narrow-gap semiconductors group, which acquire new properties in consequence of doping. Transition metals behave either as donors (Cr, Co, Ni) or neutrals (Mn).

In this paper, we present room temperature unpolarized Raman scattering spectra of Ni doped PbTe single crystal sample. Crystal of PbTe(Ni) was grown by the Bridgman method. The Ni concentration in the samples used here were 1·10¹⁹ at.%./cm³. Well resolved peaks appear at about 126, 143, 181, 362 and 724 cm^-1. The modes at 126 and 143 cm^-1, which are also observed in other telluride compounds, originate from vibrations in TeO₂. We assume that the mode at about 181 cm^-1 is connected to excitations of a local phonon mode in the vicinity of an impurity atom (donor Ni³⁺ state). Modes at about 362 cm^-1 and 724 cm^-1 are the second and forth harmonic of a local phonon mode, registered here according to multiphonon emmission (MPE). Namely, in the PbTe(Ni), the equilibrium position of the ground donor level before the electron capture is in the upper half of the gap. After the capture of the electron, the lattice near the defect relaxes in such a way as to lower the equilibrium position of the level in the energy gap. Immediately after the capture of the electron the lattice is displaced far from the new equilibrium position and there will be a violent lattice vibration at the defect. The vibration will rapidly damp down to the amplitude of the thermal vibrations (ω₀) after a small number of vibrational periods. During the damping, the localized energy propagates away from the defects as phonons.

• Legal notice:
  

  Copyright (c) Pielaszek Research, all rights reserved.
  The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
  In every case, proper references including Author(s) name(s) and URL of this webpage: https://science24.com/paper/15542 must be provided.

1. Raman scattering from ZnO doped with Fe, Mn and Co nanoparticles
2. Far-infrared and Raman Spectroscopy of CdTe_0.97Se_0.03(In)
3. Raman scattering study of polycrystalline BiFeO₃ obtained by mechanochemical synthesis
4. Low-frequency Raman scattering from transition-metal-doped ZnO nanoparticles
5. Raman spectroscopy of Pb_0.85Sn_0.15Te (In) single crystal
6. Resonant and non-resonant Raman spectra of CdTe/ZnTe self-assembled quantum dots
7. Ceria-zirconia nanoparticles doped with La or Gd: effect of the doping cation on the real structure
8. Pt-supported nanocrystalline ceria-zirconia doped with La, Pr or Gd: factors controlling syngas generation in partial oxidation/autothermal reforming of methane or oxygenates