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Sub-THz Raman response in BaTiO3 and link with structural phase transition

Abstract : The THz and sub-THz polarized Raman response was measured in tetragonal and cubic phases of single domain BaTiO 3 crystal. A large peak was detected at very low wavenumber, within a scattering geometry in which all phonon lines are Raman inactive. It is lying below 700 GHz in the whole temperature range of the tetragonal phase, and is clearly distinct from the soft phonon band. This peak has relaxational behavior with a slowing down on approaching the phase transition from above and from below.
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Submitted on : Friday, March 27, 2020 - 8:33:29 AM
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Marc Fontana, Ninel Kokanyan, Thomas Kauffmann. Sub-THz Raman response in BaTiO3 and link with structural phase transition. Journal of Physics: Condensed Matter, IOP Publishing, 2020, 32 (28), pp.285403. ⟨10.1088/1361-648X/ab808e⟩. ⟨hal-02514778⟩

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