Conferences and symposia

New effects of the electron—phonon interaction in dielectrics

Institute of Spectroscopy, Russian Academy of Sciences, ul. Fizicheskaya 5, Troitsk, Moscow, 108840, Russian Federation

We have studied the electron—phonon interaction (EPI) in multiferroic ${\text PrFe}_3({\text BO}_3){}_4$ using far-infrared (terahertz) reflection and theoretical simulation. A specific feature of ${\text PrFe}_3({\text BO}_3){}_4$ is that the 4f electronic excitation of the ${\text Pr}^{\,3+}$ 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.

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Keywords: inverted electronic oscillator, electron—phonon interaction, coupled electron—phonon mode, bifurcations in magnetic field, terahertz spectroscopy
PACS: 63.20.kd, 71.70.−d, 75.50.Ee, 75.85.+t, 78.20.Bh, 78.30.−j (all)
DOI: 10.3367/UFNe.2018.06.038413
Citation: Popova M N, Boldyrev K N "New effects of the electron—phonon interaction in dielectrics" Phys. Usp. 62 275–281 (2019)
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Received: 12th, August 2018, 20th, June 2018

Оригинал: Попова М Н, Болдырев К Н «Новые эффекты электрон-фононного взаимодействия в диэлектриках (к 50-летию Института спектроскопии РАН)» УФН 189 292–298 (2019); DOI: 10.3367/UFNr.2018.06.038413

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