Ferroelectric phase transitions induced by a strain gradient

0552099 - FZÚ 2022 RIV US eng J - Článek v odborném periodiku
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
Grant CEP: GA MŠMT LM2018110; GA MŠMT(CZ) EF16_019/0000760; GA ČR(CZ) GA19-09671S; GA ČR(CZ) GA21-09685S
Grant ostatní: OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institucionální podpora: RVO:68378271
Klíčová slova: perovskite * oxide * ferroelectrics * gradients
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Způsob publikování: 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.
Trvalý link: http://hdl.handle.net/11104/0327257