Peräntie, J., Savinov, M., Kocourek, T., Jelínek, M., Jantunen, H., Dejneka, A., Tyunina, M. (2019) Hybrid polar state in epitaxial (111) PbSc0.5Nb0.5O3 relaxor ferroelectric films. Physical Review Materials, 3 (1), 014403. doi:10.1103/PhysRevMaterials.3.014403
Hybrid polar state in epitaxial (111) PbSc0.5Nb0.5O3 relaxor ferroelectric films
|Author:||Peräntie, J.1; Savinov, M.2; Kocourek, T.2;|
1Microelectronics Research Unit, University of Oulu, P.O. Box 4500, FI-90014 Oulu, Finland
2Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, 18221 Prague, Czech Republic
|Online Access:||PDF Full Text (PDF, 1 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe201902064194
American Physical Society,
|Publish Date:|| 2019-02-06
In relaxor ferroelectrics, the interplay between the short-range-order dipolar state and long-range-order ferroelectric state leads to outstanding response functions, which enable valuable capacitor, electromechanical, pyroelectric, and electrocaloric applications. Advanced applications are envisaged with epitaxial relaxor ferroelectric films, whose fundamentals are still poorly explored. In particular, frustration of ferroelectricity, contrasting the bulk behavior, has been found and ascribed to nonpolar crystal orientation in (001) epitaxial films of archetypical lead-based relaxors. Here, a peculiar hybrid polar state, where coexisting long-range and short-range orders persist to very low temperatures, is demonstrated in epitaxial polar-oriented (111) PbSc0.5Nb0.5O3 films. The hybrid state is evidenced by relaxorlike frustrations of ferroelectric transition and the Curie-Weiss behavior, validity of the Vogel-Fulcher relationship, a non-Rayleigh dynamic nonlinearity, and a ferroelectriclike low-temperature polarization. Local fluctuations of lattice strain arising from the relaxation of large epitaxial misfit are suggested to be responsible for the hybrid polar state. Introducing strain fluctuations by doping or nanostructuring is anticipated to boost the dynamic dielectric and piezoelectric performance of many perovskite oxide ferroelectrics.
Physical review. Materials
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
114 Physical sciences
The work was supported by the Academy of Finland (Grant No. 298409) and in part by the European Structural and Investment Funds and Ministry of Education, Youth and Sports of the Czech Republic through Programme “Research, Development and Education” (Project No. SOOLID21 - CZ.02.1.01/0.0/0.0/16_019/0000760).
|Academy of Finland Grant Number:||
298409 (Academy of Finland Funding decision)
©2019 American Physical Society.