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Skoromets, V.; Kadlec, C.; Němec, H.; Fattakhova-Rohlfing, D.; Kužel, P. (2016): Tunable dielectric properties of KTaO3 single crystals in the terahertz range. In: Journal of Physics D-Applied Physics, Vol. 49, No. 6, 65306
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Abstract

Electric-field tunability of the dielectric properties of potassium tantalate single crystal was studied by terahertz spectroscopy in a broad temperature range (40-250 K). Complex-valued terahertz transmission spectra of samples were measured with an external electric field perpendicular to the sample surface and parallel to the terahertz wave-vector. We found that the ferroelectric soft mode hardening is fully responsible for the observed electricfield-induced changes in the spectra and no signature of a central mode was detected. We determined the anharmonic properties of the soft-mode potential in the mean field approximation. The observed behavior was compared with that previously reported for SrTiO3 single crystals.