Optical and Magnetic Properties of PbTe(Ni)

N. Romčević a, J. Trajić a, M. Romčević a, D. Stojanović a, T.A. Kuznetsova b, D.R. Khokhlov b, W. Dobrowolski c, R. Rudolfd,e and I. Anžel d a Institute of Physics, Pregrevica 118, 11080 Belgrade, Serbia b Moscow State University, 119899 Moscow, Russia c Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warszawa, Poland d Faculty of Mechanical Engineering, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia e Zlatarna Celje d.d., Kersnikova 19, 3000 Celje, Slovenia

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Far-infrared and magnetic properties of Ni doped PbTe (ZNi = 1 × 1019 at./cm3) single crystal are investigated in a broad range of temperature and magnetic fields. Far-infrared reflection spectra were analyzed using a fitting procedure based on the modified plasmon-two phonon interaction model. Together with the strong plasmon-two longitudinal optical phonon coupling we obtained a local mode of Ni at about 180 cm-1. This mode intensity depends on temperature. Magnetic measurements shows that PbTe alloys doped with Ni reveals weak ferromagnetic interaction between magnetic ions.

DOI: 10.12693/APhysPolA.115.805 PACS numbers: 63.20.-e, 63.20.Kr, 78.30.-j