Interfacial Oxygen Octahedral Coupling-Driven Robust Ferroelectricity in Epitaxial Na_(0.5)Bi_(0.5)TiO_(3)Thin Films  

作　　者：Haojie Han Qinghua Zhang Wei Li Yiqun Liu Jiasheng Guo Yue Wang Qian Li Lin Gu Ce-Wen Nan Jing Ma 

机构地区：[1]State Key Laboratory of New Ceramics and Fine Processing,Schoolof Materials Science and Engineering,Tsinghua University,Beijing 100084,China [2]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Research》2024年第2期149-157,共9页研究（英文）

基　　金：supported by the National Key Research Program of China(Grant No.2022YFB3807604);the National Natural Science Foundation of China(Grant Nos.52027817,52072400,52025025,and 52150092).

摘　　要：The oxygen octahedral rotation(OOR)forms fundamental atomic distortions and symmetries in perovskite oxides and definitely determines their properties and functionalities.Therefore,epitaxial strain and interfacial structural coupling engineering have been developed to modulate the OOR patterns and explore novel properties,but it is difficult to distinguish the 2 mechanisms.Here,different symmetries are induced in Na_(0.5)Bi_(0.5)TiO_(3)(NBT)epitaxial films by interfacial oxygen octahedral coupling rather than epitaxial strain.The NBT film grown on the Nb:SrTiO_(3)substrate exhibits a paraelectric tetragonal phase,while with La_(0.5)Sr_(0.5)MnO_(3)as a buffer layer,a monoclinic phase and robust ferroelectricity are obtained,with a remanent polarization of 42μC cm^(-2)and a breakdown strength of 7.89 MV cm^(-1),which are the highest record among NBT-based films.Moreover,the interfacial oxygen octahedral coupling effect is demonstrated to propagate to the entire thickness of the film,suggesting an intriguing long-range effect.This work provides a deep insight into understanding the structure modulation in perovskite heterostructures and an important avenue for achieving unique functionalities.

关 键 词：effect. INTERFACIAL coupling 

分 类 号：O48[理学—固体物理]