This title appears in the Scientific Report :
2009
Please use the identifier:
http://dx.doi.org/10.1088/0953-8984/21/11/115902 in citations.
High tunability of the soft mode in strained SrTiO3/DyScO3 multilayers
High tunability of the soft mode in strained SrTiO3/DyScO3 multilayers
SrTiO(3)/DyScO(3) epitaxial multilayers with variable number and thickness (10-100 nm) of bilayers deposited on DyScO(3) substrates were investigated by means of time-domain terahertz spectroscopy at room temperature. A tensile strain develops in the SrTiO(3) films and shifts the eigenfrequency of t...
Saved in:
Personal Name(s): | Kadlec, C. |
---|---|
Kadlec, F.K / Nemec, H. / Kuzel, P. / Schubert, J. / Panaitov, G. | |
Contributing Institute: |
Institut für Bio- und Nanosysteme - Bioelektronik; IBN-2 Halbleiter-Nanoelektronik; IBN-1 JARA-FIT; JARA-FIT |
Published in: | Journal of physics / Condensed matter, 21 (2009) S. 115902-1 - 115908-8 |
Imprint: |
Bristol
IOP Publ.
2009
|
Physical Description: |
115902-1 - 115908-8 |
PubMed ID: |
21693932 |
DOI: |
10.1088/0953-8984/21/11/115902 |
Document Type: |
Journal Article |
Research Program: |
Grundlagen für zukünftige Informationstechnologien |
Series Title: |
Journal of Physics: Condensed Matter
21 |
Subject (ZB): | |
Publikationsportal JuSER |
SrTiO(3)/DyScO(3) epitaxial multilayers with variable number and thickness (10-100 nm) of bilayers deposited on DyScO(3) substrates were investigated by means of time-domain terahertz spectroscopy at room temperature. A tensile strain develops in the SrTiO(3) films and shifts the eigenfrequency of the ferroelectric soft mode down by ∼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. |