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

T. Yamada, J. Petzelt, A. K. Tagantsev, S. Denisov, D. Noujni, P. K. Petrov, A. MacKova, K. Fujito, T. Kiguchi, K. Shinozaki, N. Mizutani, V. O. Sherman, P. Muralt, N. Setter

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31 Citations (Scopus)


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.

Original languageEnglish
Article number157602
JournalPhysical review letters
Issue number15
Publication statusPublished - 2006
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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