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

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  
【摘要】:Recently, 5d transition metal iridates have been reported as promising materials for the manufacture of exotic quantum states. Apart from the semimetallic ground states that have been observed, perovskite SrIrO_3 is also predicted to have a lattice-symmetrically protected topological state in the(110) plane due to its strong spin–orbit coupling and electron correlation. Compared with non-polar(001)-SrIrO_3, the especial polarity of(110)-SrIrO_3 undoubtedly adds the difficulty of fabrication and largely impedes the research on its surface states. Here, we have successfully synthesized high-quality(110)-SrIrO_3 thin films on(110)-SrTiO_3 substrates by reactive molecular beam epitaxy for the first time. Both reflection high-energy electron diffraction patterns and x-ray diffraction measurements suggest the expected orientation and outstanding crystallinity. A(1 × 2) surface reconstruction driven from the surface instability, the same as that reported in(110)-SrTiO_3, is observed. The electric transport measurements uncover that(110)-SrIrO_3 exhibits a more prominent semimetallic property in comparison to(001)-SrIrO_3.

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