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Ferroelectric phase transition in polycrystalline KTaO3 thin film revealed by terahertz spectroscopy
- Source :
- Applied Physics Letters. 99:052908
- Publication Year :
- 2011
- Publisher :
- AIP Publishing, 2011.
-
Abstract
- KTaO3 single crystal is an archetypal incipient ferroelectric in which a long-range ferroelectric order does not establish at low temperatures owing to quantum fluctuations. We report on a strong evidence of the ferroelectric phase transition near 60 K revealed by terahertz spectroscopy and microwave permittivity measurements of a polycrystalline KTaO3 thin film on (0001) sapphire substrate prepared by chemical solution deposition. The soft mode behavior is clearly observed in the terahertz (THz) spectra with a minimum frequency at 60 K. At the same temperature microwave permittivity maximum appears. The THz spectra strongly resemble that of strained epitaxial SrTiO3/DyScO3 films: the ferroelectric soft mode is linearly coupled to a central peak which is silent in the paraelectric phase and it becomes coupled to the polarization below the ferroelectric transition temperature with a progressively increasing bare strength.
Details
- ISSN :
- 10773118 and 00036951
- Volume :
- 99
- Database :
- OpenAIRE
- Journal :
- Applied Physics Letters
- Accession number :
- edsair.doi...........89f31a491a7f528e98a7d925553806cb
- Full Text :
- https://doi.org/10.1063/1.3624710