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This article is cited in 2 scientific papers (total in 2 papers)
CONDENSED MATTER
Fluctuations of the multiplicity of Co$^{3+}$ ions and softening of the phonon spectrum of rare-earth cobalt oxides
Yu. S. Orlovab, V. A. Dudnikova, A. E. Sokolovba, T. M. Ovchinnikovac, N. P. Shestakova, S. G. Ovchinnikovab a Kirensky Institute of Physics, Federal Research Center KSC, Siberian Branch, Russian Academy of Sciences,
Krasnoyarsk, 660036 Russia
b Siberian Federal University, Krasnoyarsk, 660041 Russia
c Sukachev Institute of Forest, Federal Research Center KSC, Siberian Branch, Russian Academy of Sciences,
Krasnoyarsk, 660036 Russia
Abstract:
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 electron–phonon coupling quadratic in the lattice displacement and to fluctuations of the multiplicity of Co$^{3+}$ ions.
Received: 10.04.2022 Revised: 10.04.2022 Accepted: 11.04.2022
Citation:
Yu. S. Orlov, V. A. Dudnikov, A. E. Sokolov, T. M. Ovchinnikova, N. P. Shestakov, S. G. Ovchinnikov, “Fluctuations of the multiplicity of Co$^{3+}$ ions and softening of the phonon spectrum of rare-earth cobalt oxides”, Pis'ma v Zh. Èksper. Teoret. Fiz., 115:10 (2022), 650–655; JETP Letters, 115:10 (2022), 615–619
Linking options:
https://www.mathnet.ru/eng/jetpl6675 https://www.mathnet.ru/eng/jetpl/v115/i10/p650
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Abstract page: | 84 | References: | 21 | First page: | 12 |
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