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Emergent Antipolar Phase in BiFeO3-La0.7Sr0.3MnO3 Superlattice.
Nano Letters ( IF 9.6 ) Pub Date : 2020-07-09 , DOI: 10.1021/acs.nanolett.0c02063 Wen Dong 1 , Jonathan J P Peters 1 , Dorin Rusu 1 , Michael Staniforth 1 , Alan E Brunier 1 , James Lloyd-Hughes 1 , Ana M Sanchez 1 , Marin Alexe 1
Nano Letters ( IF 9.6 ) Pub Date : 2020-07-09 , DOI: 10.1021/acs.nanolett.0c02063 Wen Dong 1 , Jonathan J P Peters 1 , Dorin Rusu 1 , Michael Staniforth 1 , Alan E Brunier 1 , James Lloyd-Hughes 1 , Ana M Sanchez 1 , Marin Alexe 1
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Ferroelectric–paraelectric superlattices show emerging new states, such as polar vortices, through the interplay and different energy scales of various thermodynamic constraints. By introducing magnetic coupling at BiFeO3–La0.7Sr0.3MnO3 interfaces epitaxially grown on SrTiO3 substrate, we find, for the first time in thin films, a sub-nanometer thick lamella-like BiFeO3. The emergent phase is characterized by an arrangement of a two unit cell thick lamella-like structure featuring antiparallel polarization, resulting an antiferroelectric-like structure typically associated with a morphotropic phase transition. The antipolar phase is embedded within a nominal R3c structure and is independent of the BiFeO3 thickness (4–30 unit cells). Moreover, the superlattice structure with the morphotropic phase demonstrates azimuth-independent second harmonic generation responses, indicating a change of overall symmetry mediated by a delicate spatial distribution of the emergent phase. This work enriches the understanding of a metastable state manipulated by thermodynamic constraints by lattice strain and magnetic coupling.
中文翻译：
BiFeO3-La0.7Sr0.3MnO3超晶格中出现的反极性相。
铁电-顺电超晶格通过各种热力学约束的相互作用和不同的能级显示了新出现的状态，例如极涡。通过在SrTiO 3衬底上外延生长的BiFeO 3 -La 0.7 Sr 0.3 MnO 3界面处引入磁耦合，我们首次在薄膜中发现了亚纳米厚的薄片状BiFeO 3。出射相的特征在于具有反平行极化的两个单位晶格厚的薄片状结构的排列，从而产生通常与同相相变相关的类似反铁电结构。反极性相嵌入标称R中3 c结构，与BiFeO 3厚度（4–30个晶胞）无关。此外，具有变质相的超晶格结构表现出与方位角无关的二次谐波产生响应，表明由出射相的精细空间分布介导的整体对称性变化。这项工作丰富了对由晶格应变和磁耦合的热力学约束所操纵的亚稳态的理解。
更新日期：2020-08-12
中文翻译：
BiFeO3-La0.7Sr0.3MnO3超晶格中出现的反极性相。
铁电-顺电超晶格通过各种热力学约束的相互作用和不同的能级显示了新出现的状态，例如极涡。通过在SrTiO 3衬底上外延生长的BiFeO 3 -La 0.7 Sr 0.3 MnO 3界面处引入磁耦合，我们首次在薄膜中发现了亚纳米厚的薄片状BiFeO 3。出射相的特征在于具有反平行极化的两个单位晶格厚的薄片状结构的排列，从而产生通常与同相相变相关的类似反铁电结构。反极性相嵌入标称R中3 c结构，与BiFeO 3厚度（4–30个晶胞）无关。此外，具有变质相的超晶格结构表现出与方位角无关的二次谐波产生响应，表明由出射相的精细空间分布介导的整体对称性变化。这项工作丰富了对由晶格应变和磁耦合的热力学约束所操纵的亚稳态的理解。
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