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- W2041010376 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." @default.
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- W2041010376 date "2011-08-01" @default.
- W2041010376 modified "2023-10-18" @default.
- W2041010376 title "Ferroelectric phase transition in polycrystalline KTaO3 thin film revealed by terahertz spectroscopy" @default.
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- W2041010376 doi "https://doi.org/10.1063/1.3624710" @default.
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