Ferroelectric phase transitions induced by a strain gradient

0552099 - FZÚ 2022 RIV US eng J - Journal Article
Yudin, Petr - Duchoň, Jan - Pacherová, Oliva - Klementová, Mariana - Kocourek, Tomáš - Dejneka, Alexandr - Tyunina, Marina
Ferroelectric phase transitions induced by a strain gradient.
Physical Review Research. Roč. 3, č. 3 (2021), č. článku 033213. E-ISSN 2643-1564
R&D Projects: GA MŠMT LM2018110; GA MŠMT(CZ) EF16_019/0000760; GA ČR(CZ) GA19-09671S; GA ČR(CZ) GA21-09685S
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271
Keywords : perovskite * oxide * ferroelectrics * gradients
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Method of publishing: Open access

In perovskite oxide ferroelectrics, gradients of lattice strain are known to induce nanoscale topological structures, leading to novel or enhanced functionality. Here, we experimentally detect and theoretically analyze thickness distribution of structural properties in epitaxial Pb0,5Sr0,5TiO3 films grown on (001) SrTiO3 substrates. We show that the relaxation of substrate-imposed stress produces a strain gradient, which leads to the formation of distinct ferroelectric phases as a function of distance from the film-substrate interface within the same film. Charge carriers trapped at phase boundaries stabilize the induced phases and manifest themselves under electric field.
Permanent Link: http://hdl.handle.net/11104/0327257