In-plane and out-of-plane ferroelectric instabilities in epitaxial SrTiO3 films

被引：25
|
作者：
Yamada, T [1 ]
Petzelt, J
Tagantsev, AK
Denisov, S
Noujni, D
Petrov, PK
Mackova, A
Fujito, K
Kiguchi, T
Shinozaki, K
Mizutani, N
Sherman, VO
Muralt, P
Setter, N
机构：
[1] Ecole Polytech Fed Lausanne, Swiss Fed Inst Technol, Ceram Lab, CH-1015 Lausanne, Switzerland
[2] Acad Sci Czech Republic, Inst Phys, Prague 18221 8, Czech Republic
[3] S Bank Univ, Ctr Phys Elect & Mat, London SE1 0AA, England
[4] Acad Sci Czech Republic, Inst Nucl Phys, CZ-25068 Rez, Czech Republic
[5] Tokyo Inst Technol, Dept Met & Ceram Sci, Meguro Ku, Tokyo 1528550, Japan
[6] Tokyo Inst Technol, Ctr Adv Mat Anal, Meguro Ku, Tokyo 1528550, Japan
来源：
PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 15期
关键词：
D O I：
10.1103/PhysRevLett.96.157602
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The in-plane and out-of-plane ferroelectric instabilities in compressed (100)-epitaxial SrTiO3 films were examined by infrared reflection spectroscopy. The strongly stiffened in-plane soft mode frequency softened very slowly on cooling. On the other hand, the silent mode appeared at around 150 K, indicating an out-of-plane ferroelectric transition. This behavior points to a split of in-plane and out-of-plane ferroelectric instability temperatures due to the lowered symmetry of the SrTiO3 lattice caused by mechanical misfit strain. Infrared spectroscopy provides a possibility to detect such an effect in the strained epitaxial ferroelectric films.
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页数：4
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