Fluctuations of the Multiplicity of Co3+ Ions and Softening of the Phonon Spectrum of Rare-Earth Cobalt Oxides

An unconventional temperature dependence of infrared absorption spectra of rare-earth cobalt oxides LaCoO 3 and GdCoO 3 has been studied experimentally and theoretically in the temperature range of 3.2–550 K. A quite strong softening of the optical phonon mode has been detected, which cannot be expl...

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Bibliographic Details
Published in:JETP letters 2022-05, Vol.115 (10), p.615-619
Main Authors: Orlov, Yu. S., Dudnikov, V. A., Sokolov, A. E., Ovchinnikova, T. M., Shestakov, N. P., Ovchinnikov, S. G.
Format: Article
Language:English
Subjects:
Absorption spectra
Anharmonicity
Atomic
Biological and Medical Physics
Biophysics
Cobalt oxides
Condensed Matter
Displacements (lattice)
Infrared absorption
Infrared spectra
Molecular
Optical and Plasma Physics
Particle and Nuclear Physics
Phonons
Physics
Physics and Astronomy
Quantum Information Technology
Rare earth elements
Red shift
Softening
Solid State Physics
Spintronics
Temperature dependence
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Summary:An unconventional temperature dependence of infrared absorption spectra of rare-earth cobalt oxides LaCoO 3 and GdCoO 3 has been studied experimentally and theoretically in the temperature range of 3.2–550 K. A quite strong softening of the optical phonon mode has been detected, which cannot be explained by standard lattice anharmonicity. It has been shown that the redshift of the phonon spectrum is due to the e-lectron–phonon coupling quadratic in the lattice displacement and to fluctuations of the multiplicity of Co 3+ ions.
ISSN:0021-3640
1090-6487
DOI:10.1134/S0021364022100575