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

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, in...

Full description

Saved in:
Bibliographic Details
Published in:Physical review letters 2006-04, Vol.96 (15), p.157602-157602
Main Authors: Yamada, T, Petzelt, J, Tagantsev, A K, Denisov, S, Noujni, D, Petrov, P K, Mackova, A, Fujito, K, Kiguchi, T, Shinozaki, K, Mizutani, N, Sherman, V O, Muralt, P, Setter, N
Format: Article
Language:English
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0031-9007
DOI:10.1103/PhysRevLett.96.157602