Dependence of Soft Phonon Spectra on Flexoelectric Coupling in Ferroelectrics

  • A. N. Morozovska Institute of Physics, Nat. Acad. Sci. of Ukraine, Taras Shevchenko National University of Kyiv, Faculty of Physics, Chair of Theoretical Physics
  • C. M. Scherbakov Taras Shevchenko National University of Kyiv, Faculty of Physics, Chair of Theoretical Physics
  • M. D. Glinchuk I.M. Frantsevich Institute for Problems of Materials Science, Nat. Acad. Sci. of Ukraine

Abstract

Analytical expressions describing the frequency dispersion of the soft transverse acoustic (TA)
and optic (TO) phonon modes in uniaxial ferroelectrics, as well as their dependence on the
flexoelectric coupling constant f, have been analyzed in the framework of the Landau–Ginzburg–
Devonshire theory. A critical behavior of the TA mode with respect to the f magnitude is
revealed.

Keywords Landau–Ginzburg–Devonshire theory, flexoelectric coupling, soft phonon modes

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Published
2018-03-02
How to Cite
Morozovska, A., Scherbakov, C., & Glinchuk, M. (2018). Dependence of Soft Phonon Spectra on Flexoelectric Coupling in Ferroelectrics. Ukrainian Journal Of Physics, 63(2), 168. doi:10.15407/ujpe63.2.168
Section
Physics of magnetic phenomena and physics of ferroics