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.
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)
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
