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.

引用

页数：4

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