Growth of high-quality perovskite (110)-SrIrO_3 thin films using reactive molecular beam epitaxy  

作　　者：Kai-Li Zhang Cong-Cong Fan Wan-Ling Liu Yv -Feng Wu Xiang-Le Lu Zheng-Tai Liu Ji-Shan Liu Zhong-Hao Liu Da-Wei Shen 张凯莉;樊聪聪;刘万领;吴宇峰;卢祥乐;刘正太;刘吉山;刘中灏;沈大伟(State Key Laboratory of Functional Materials for Informatics,Shanghai Institute of Microsystem and information technology(SIMIT),Chinese Academy of Sciences(CAS),Shanghai 200050,China;University of Chinese Academy of Sciences,Beijing 100049,China;School of Physical Science and Technology,ShanghaiTech University,Shanghai 200031,China;CAS Center for Excellence in Superconducting Electronics(CENSE),Shanghai 200050,China)

机构地区：[1]State Key Laboratory of Functional Materials for Informatics,Shanghai Institute of Microsystem and Information Technoloy（SIMIT）,Chinese Academy of Sciences（CAS）,Shanghai 200050,Chia [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]School of Physicai Science and Technology,ShanghaiTech University,Shanghai 200031,China [4]CAS Center for Excellence in Superconducting Electronics（CENSE）,Shanghai 200050,China

出　　处：《Chinese Physics B》2018年第8期578-581,共4页中国物理B（英文版）

基　　金：Project supported by the National Key Research and Development Program of the MOST of China(Grant No.2016YFA0300204);the National Key Basic Research Program of China(Grant No.2015CB654901);the National Natural Science Foundation of China(Grant Nos.11574337,11227902,11474147,and11704394);Shanghai Sailing Program(Grant No.17YF1422900);the Award for Outstanding Member in Youth Innovation Promotion Association of the Chinese Academy of Sciences

摘　　要：Recently, 5d transition metal iridates have been reported as promising materials for the manttfacture of exotic quan- tum states. Apart from the semimetallic ground states that have been observed, perovskite SrlrO3 is also predicted to have a lattice-symmetrically protected topological state in the （110） plane due to its strong： spin-orbil coupling and electron correlation. Compared with non-polar （001）-SflrO3, the especial polarity of （110）-SrIrC）3 undoubtedly adds the： difficulty of fabrication and largely impedes the research on its surface states. Here, we have successfully synthesized high-quality （110）-SflrO3 thin films on （110）-SrTiO3 substrates by reactive molecular beam epitaxy fi^r the first time. Both reflec- tion high-energy electron diffraction pattems and x-ray diffraction measurements suggest the expected orientation and outstanding crystallinity. A （1 × 2） surface reconstruction driven from the surface instabiJity, the. same as that reported in （110）-SrTiO3, is observed. The electric transport measurements uncover that （110）-SrIrO3 exhibits a more prominent semimetallic property in comparison to （001）-SrIrO3.Recently, 5d transition metal iridates have been reported as promising materials for the manttfacture of exotic quan- tum states. Apart from the semimetallic ground states that have been observed, perovskite SrlrO3 is also predicted to have a lattice-symmetrically protected topological state in the （110） plane due to its strong： spin-orbil coupling and electron correlation. Compared with non-polar （001）-SflrO3, the especial polarity of （110）-SrIrC）3 undoubtedly adds the： difficulty of fabrication and largely impedes the research on its surface states. Here, we have successfully synthesized high-quality （110）-SflrO3 thin films on （110）-SrTiO3 substrates by reactive molecular beam epitaxy fi^r the first time. Both reflec- tion high-energy electron diffraction pattems and x-ray diffraction measurements suggest the expected orientation and outstanding crystallinity. A （1 × 2） surface reconstruction driven from the surface instabiJity, the. same as that reported in （110）-SrTiO3, is observed. The electric transport measurements uncover that （110）-SrIrO3 exhibits a more prominent semimetallic property in comparison to （001）-SrIrO3.

关 键 词：molecular beam epitaxy iridates topological crystalline metal sunace reconstruction 

分 类 号：O4[理学—物理]