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Ferroelectric phase transition in polycrystalline KTaO3 thin film revealed by terahertz spectroscopy

Authors :
V. Bovtun
Barbara Malič
Martin Kempa
V. Skoromets
Jan Petzelt
S. Kamba
M. Kosec
Sebastjan Glinsek
Petr Kužel
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