Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 21, Issue 11, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/21/11/115902
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Funding
- Academy of Sciences of the Czech Republic [AVOZ10100520]
- Ministry of Education of the Czech Republic [LC-512]
- [A100100907]
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SrTiO3/DyScO3 epitaxial multilayers with variable number and thickness (10-100 nm) of bilayers deposited on DyScO3 substrates were investigated by means of time-domain terahertz spectroscopy at room temperature. A tensile strain develops in the SrTiO3 films and shifts the eigenfrequency of the ferroelectric soft mode down by similar to 25-45 cm(-1) with respect to the value found for single crystals. In all films the soft mode strongly hardens upon the electrical bias and a linear coupling to a silent excitation of relaxation type at 10 cm(-1) is observed. We show that the change in the THz and sub-THz response of the layers with an increasing field is determined solely by the soft mode eigenfrequency and we propose a phenomenological model describing the origin of the tunability and the peculiar properties of the ferroelectric soft mode in the terahertz spectral range.
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