Interfacial B-site atomic configuration in polar (111) and non-polar (001) SrIrO3/SrTiO3 heterostructures
Interfacial B-site atomic configuration in polar (111) and non-polar (001) SrIrO3/SrTiO3 heterostructures
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DOI：
10.1063/1.4993170
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发表时间：
2017-09
期刊：
影响因子：
6.1
通讯作者：
T. Anderson;Hua Zhou;L. Xie;J. Podkaminer;J. J. Patzner-J.;S. Ryu;Xiaoqing Pan;C. Eom
中科院分区：
文献类型：
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作者：
T. Anderson;Hua Zhou;L. Xie;J. Podkaminer;J. J. Patzner-J.;S. Ryu;Xiaoqing Pan;C. Eom
ABO3 钙钛矿异质结构中界面原子排列的精确控制至关重要，特别是在材料的后续电子特性沿极性晶体方向表现出几何偏好的情况下，不可避免地会出现复杂的表面重构。在这里，我们展示了极性 (111) 和非极性 (001) SrIrO3/SrTiO3 界面中的 B 位界面结构。使用扫描透射电子显微镜和基于同步加速器的相干布拉格棒分析来检查异质结构。我们的结果揭示了由于生长前极性补偿的 SrTiO3 基底表面导致 B 位在 (111) 界面上混合的偏好。相比之下，非极性 (001) 界面处的混合可以忽略不计。这一发现表明，混合可能是必要的，以减轻沿重重构和非化学计量（111）钙钛矿表面的外延。此外，这种优惠的 B 站点配置可以允许...
The precise control of interfacial atomic arrangement in ABO3 perovskite heterostructures is paramount, particularly in cases where the subsequent electronic properties of the material exhibit geometrical preferences along polar crystallographic directions that feature inevitably complex surface reconstructions. Here, we present the B-site interfacial structure in polar (111) and non-polar (001) SrIrO3/SrTiO3 interfaces. The heterostructures were examined using scanning transmission electron microscopy and synchrotron-based coherent Bragg rod analysis. Our results reveal the preference of B-site intermixing across the (111) interface due to the polarity-compensated SrTiO3 substrate surface prior to growth. By comparison, the intermixing at the non-polar (001) interface is negligible. This finding suggests that the intermixing may be necessary to mitigate epitaxy along heavily reconstructed and non-stoichiometric (111) perovskite surfaces. Furthermore, this preferential B-site configuration could allow the...