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

被引：12
作者：
Fontana, Marc D. [1 ,2 ]
Kokanyan, Ninel [1 ,2 ]
Kauffmann, Thomas H. [1 ,2 ]
机构：
[1] Univ Lorraine, CenraleSupelec, LMOPS, F-57000 Metz, France
[2] Univ Paris Saclay, Cent Supelec, Lab Mat Opt Photon & Syst, F-57070 Metz, France
来源：
JOURNAL OF PHYSICS-CONDENSED MATTER | 2020年 / 32卷 / 28期
关键词：
ferroelectrics; phase transitions; BaTiO3; Raman spectroscopy; phonon; relaxation; order-disorder; SOFT-MODE SPECTROSCOPY; PEROVSKITES; DISPLACIVE; CROSSOVER;
D O I：
10.1088/1361-648X/ab808e
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The THz and sub-THz polarized Raman response was measured in tetragonal and cubic phases of single domain BaTiO3 crystal. A large peak was detected at very low wavenumber, within a scattering geometry in which all phonon lines are Raman inactive. It lies 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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页数：7
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