In-plane and out-of-plane ferroelectric instabilities in epitaxial SrTiO3 films |
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| 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 |
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| Institution: | Ceramics Laboratory, Swiss Federal Institute of Technology, EPFL, CH-1015 Lausanne, Switzerland. tomoaki.yamada@epfl.ch |
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| Abstract: | 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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