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Current issue   Ukr. J. Phys. 2014, Vol. 58, N 9, p.863-864
https://doi.org/10.15407/ujpe58.09.0863    Paper

Stupka A.A.

Oles Honchar Dnipropetrovsk National University
(72, Gagarin Ave., Dnipropetrovsk 49050, Ukraine; e-mail: antonstupka@mail.ru)

Long-Wave High-Frequency Oscilations in Ionic Crystals with Two Atoms in Elementary Cell

Section: Solid matter
Original Author's Text: Ukrainian

Abstract: Long-wave high-frequency electromagnetic oscillations in an ionic crystal with two atoms in an elementary cell have been considered in the framework of a self-consistent model for free point charges in the electromagnetic field in a dielectric medium. The frequency of longitudinal phonons is shown to equal the ionic plasma frequency divided by the square root of the highfrequency dielectric permittivity. The standard dispersion law for the upper phonon-polariton branch is obtained.

Key words: long-wave oscillations, phonon-polariton, ion plasma frequency.

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