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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

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 $PrFe_3(BO_3)_4$ using far-infrared (terahertz) reflection and theoretical simulation. A specific feature of $PrF_3(BO_3)_4$ is that the 4f electronic excitation of the $Pr^{3+}$ ion falls into a range between the longitudinal (LO) and transverse (TO) phonon frequencies. Inversion of the electronic oscillator occurs: its LO frequency becomes smaller than the TO frequency. As temperature diminishes, a coupled electron–phonon mode emerges, and a new effect is observed: the reststrahlen band corresponding to a nondegenerate phonon mode splits. Another effect caused by the EPI is the existence 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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Full text: http://www.ufn.ru/ru/articles/2019/3/g/
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English version:
Physics–Uspekhi, 2019, 62:3

Document Type: Article
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”, UFN, 189:3 (2019), 292–298

Citation in format AMSBIB
\Bibitem{PopBol19}
\by M.~N.~Popova, K.~N.~Boldyrev
\paper New effects of the electron--phonon interaction in dielectrics
\jour UFN
\yr 2019
\vol 189
\issue 3
\pages 292--298
\mathnet{http://mi.mathnet.ru/ufn6364}
\crossref{https://doi.org/10.3367/UFNr.2018.06.038413}
\elib{http://elibrary.ru/item.asp?id=37038652}


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