ACTA

Raman Spectroscopy of Multiphonon Emission Process in Ni-Doped PbTe

N. Romčević^a, J. Trajić^a, B. Hadžić^a, M. Romčević^a, D. Stojanović^a, Z. Lazarević^a, T.A. Kuznetsova^b, D.R. Khokhlov^b, R. Rudolf^c,d and I. Anžel^c
^aInstitute of Physics, Pregrevica 118, 11080 Belgrade, Serbia,
^bMoscow State University, 119899 Moscow, Russia,
^cFaculty of Mechanical Engineering, University of Maribor, 2000 Maribor, Slovenia,
^dZlatarna Celje d.d., 3000 Celje, Slovenia

Full Text PDF

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 sample used here was 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 fourth harmonic of a local phonon mode, registered here due to multiphonon emission.

DOI: 10.12693/APhysPolA.116.91
PACS numbers: 71.28.+d, 63.20.-e, 78.30.-j