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Properties of the low-frequency phonon spectra of ferroelectric barium titanate-based heterostructures

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arxiv 1910.02682 v1 pith:JNDFYRDR submitted 2019-10-07 cond-mat.mtrl-sci cond-mat.mes-hall

E. D. Gor'kovaya , Yu. A. Tikhonov , V. I. Torgashev , A. S. Mikheykin , I. A. Luk'yanchuk , D. Mezzane , N. Ortega , A. Kumar
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R. S. Katiyar A. G. Razumnaya
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classification cond-mat.mtrl-scicond-mat.mes-hall
keywords tio3batio3spectrasuperlatticebi-colorheterostructuresrangestudied
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Polarized Raman spectra of the epitaxial Ba0.5Sr0.5TiO3 film, bi-color BaTiO3/Ba0.5Sr0.5TiO3 superlattice, and tri-color BaTiO3/Ba0.5Sr0.5TiO3/SrTiO3 superlattice were studied in a broad temperature range of 80-700 K. Based on the temperature dependence of the polar modes we determined the phase transitions temperatures in the studied heterostructures. In the sub-THz frequency range of the Y(XZ)Y spectra, we revealed the coexistence of the Debye-type central peak and soft mode in bi-color BaTiO3/Ba0.5Sr0.5TiO3 superlattice.

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