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Molecular beam epitaxy growth and surface structure of Sr_(1-x)Nd_xCuO_2 cuprate films

机译：Sr_（1-x）Nd_xcuo_2铜膜的分子束外延生长和表面结构

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摘要

We report on the epitaxial growth and surface structure of infinite-layer cuprate Sr_(1-x)Nd_xCuO_2 films on SrTiO_3(001) substrates by combining ozone-assisted molecular beam epitaxy and in situ scanning tunneling microscopy. Careful substrate temperature and flux control has been used to achieve single-phase, stoichiomelric, and r-axis oriented films. The surface of the films is usually characterized by a mixed CuO_2 surface and gridlike superstructure. The superstructure exhibits a periodicity of 3.47 nm that corresponds to a coincidence lattice between the overlayer peroxide SrO_2 and underlying CuO_2 plane, and gives rise to a conductance spectrum that is distinct from the Mott-Hubbard band structure of CuO_2. At a higher Nd composition ⅹ ＞ 0.1, a (2 × 2) surface characteristic of the hole-doped CuO_2 emerges, which we ascribe to the intake of apical oxygens in the intervening Sr planes.
机译：通过组合臭氧辅助分子束外延和原位扫描隧穿显微镜，通过组合臭氧辅助分子束外壳对SRTIO_3（001）衬底的无限层铜Sr_（1-x）Nd_xcuo_2膜的外延生长和表面结构。仔细的基板温度和助焊剂控制已用于实现单相，化学键和R轴取向的薄膜。薄膜的表面的特征通常是混合的CuO_2表面和网格状上部结构。上部结构表现出3.47nm的周期性，其对应于覆盖物过氧化物SrO_2和下面的CuO_2平面之间的重合格子，并产生与CuO_2的Mott-Hubbard带结构不同的电导谱。在较高的Nd组合物中≥101，掺杂的CuO_2的（2×2）表面特征出现，我们归因于中间SR平面中的顶端氧气的摄入量。

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  • 来源
    《Physical review》 |2020年第18期|180508.1-180508.5|共5页
  • 作者

    Jia-Qi Fan; Shu-Ze Wang; Xue-Qing Yu; Rui-Feng Wang; Yan-Ling Xiong; Can-Li Song; Xu-Cun Ma; Qi-Kun Xue;

  • 作者单位

    State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics Tsinghua University Beijing 100084 China;

    State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics Tsinghua University Beijing 100084 China;

    State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics Tsinghua University Beijing 100084 China;

    State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics Tsinghua University Beijing 100084 China;

    State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics Tsinghua University Beijing 100084 China;

    State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics Tsinghua University Beijing 100084 China Frontier Science Center for Quantum Information Beijing 100084 China;

    State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics Tsinghua University Beijing 100084 China Frontier Science Center for Quantum Information Beijing 100084 China;

    State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics Tsinghua University Beijing 100084 China Frontier Science Center for Quantum Information Beijing 100084 China Beijing Academy of Quantum Information Sciences Beijing 100193 China;

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