Dynamic nonlinearity in epitaxial BaTiO.sub.3./sub. films

0470508 - FZÚ 2017 RIV US eng J - Journal Article
Tyunina, Marina - Savinov, Maxim
Dynamic nonlinearity in epitaxial BaTiO₃ films.
Physical Review B. Roč. 94, č. 5 (2016), 1-6, č. článku 054109. ISSN 2469-9950. E-ISSN 2469-9969
R&D Projects: GA ČR GA15-15123S
Institutional support: RVO:68378271
Keywords : dynamic nonlinearity * epitaxial * BaTiO₃ films
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 3.836, year: 2016

Dynamic dielectric and piezoelectric constants of ferroelectrics increase proportionally to the amplitude of alternating electric field as a result of hysteretic Rayleigh-type motion of domain walls. Here a hysteresis-free quadratic field dependence of the dynamic dielectric response is experimentally demonstrated in the absence of domain walls in epitaxial BaTiO3 films. This extraordinary behavior is related to polar entities, whose presence is confirmed by the Vogel-Fulcher relaxation. The polar entities are ascribed to polarization fluctuations associated with lattice inhomogeneity.
Permanent Link: http://hdl.handle.net/11104/0268130