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Spectroscopic studies of 2H‐PbI 2 (Mn) layered crystals
Author(s) -
Motsnyi F. V.,
Dorogan V. G.,
Kovalyuk Z. D.,
Okulov S. M.,
Yaremko A. M.
Publication year - 2005
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200540086
Subject(s) - anharmonicity , electron paramagnetic resonance , exciton , raman spectroscopy , impurity , ion , spectral line , condensed matter physics , lattice vibration , lattice (music) , fermi resonance , chemistry , doping , phonon , exchange interaction , materials science , crystallography , nuclear magnetic resonance , physics , ferromagnetism , optics , acoustics , organic chemistry , astronomy
For the first time we studied Raman, exciton and EPR spectra of PbI 2 layered crystals of 2H polytype doped with high concentration of Mn impurity. A novel type of Fermi resonance was found. The anomalous temperature shift of the exciton band n = 1 was registered. It was shown that this shift can be explained by means of anharmonic vibrations of layered lattice at T < 40 K and low‐frequency optical phonons at T > 40 K. The manifestation of single and exchange‐bound Mn 2+ ions in EPR spectra was observed. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)