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UFN, 2019, Volume 189, Number 3, Pages 292–298 (Mi ufn6364)  

CONFERENCES AND SYMPOSIA

New effects of the electron–phonon interaction in dielectrics (50th anniversary of the Institute of Spectroscopy, Russian Academy of Sciences)

M. N. Popova, K. N. Boldyrev

Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow

Abstract: We have studied the electron–phonon interaction (EPI) in multiferroic $PrFe_3(BO_3)_4$ applying reflection methods in far-infrared (terahertz) spectral range and theoretical simulations. A specific feature of $PrF_3(BO_3)_4$ is that the 4f-electron excitation of the $Pr^{3+}$ ion falls into a range between the longitudinal (LO) and transverse (TO) phonon mode frequencies. Simultaneously, inversion of the electronic oscillator occurs: its LO frequency becomes smaller than the TO frequency. With lowering temperature, a coupled electron–phonon mode emerges, and a new effect is observed: the reststrahlen band corresponding to a nondegenerate phonon mode splits. Yet another effect caused by the EPI is the appearance of a gap in the spectrum of electronic excitations of a stoichiometric rare-earth easy-axis antiferromagnet placed into an arbitrarily weak external magnetic field directed along the easy magnetization axis.

DOI: https://doi.org/10.3367/UFNr.2018.06.038413

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English version:
Physics–Uspekhi, 2019, 62:3, 275–281

Bibliographic databases:

PACS: 63.20.kd, 71.70.-d, 75.50.Ee, 75.85.+t, 78.20.Bh, 78.30.-j
Received: August 12, 2018
Accepted: June 20, 2018

Citation: M. N. Popova, K. N. Boldyrev, “New effects of the electron–phonon interaction in dielectrics (50th anniversary of the Institute of Spectroscopy, Russian Academy of Sciences)”, UFN, 189:3 (2019), 292–298; Phys. Usp., 62:3 (2019), 275–281

Citation in format AMSBIB
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