Coexistence of the soft mode and sub-THz central peak in ferroelectric BaTiO 3 /(Ba,Sr)TiO 3 superlattices
作者： A.G. Razumnaya , Yu.A. Tikhonov , Yu.I. Yuzyuk , I.N. Zakharchenko , V.I. Torgashev
DOI: 10.1016/J.SPMI.2015.07.038
关键词: Materials science 、 Harmonic oscillator 、 Debye 、 Soft modes 、 Phase transition 、 Atmospheric temperature range 、 Superlattice 、 Raman spectroscopy 、 Ferroelectricity 、 Condensed matter physics
摘要: Abstract Near- and sub-Terahertz dynamics of soft Debye-type central modes was studied by the polarized Raman spectroscopy in ferroelectric BaTiO3/Ba0.3Sr0.7TiO3 (BT/BST) superlattice temperature range 80–400 K where system undergoes series phase transitions: paraelectric-tetragonal–monoclinic BT layers paraelectric-orthorhombic-monoclinic BST layers. It shown that evolution these can be described within model coexisted damped harmonic oscillator Debye relaxator. The occurrence pronounced mode explain recently observed relaxor-like dielectric anomaly such superlattice.
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