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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Anomalous expansion of the copper-apical-oxygen distance in superconducting cuprate bilayers
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Anomalous expansion of the copper-apical-oxygen distance in superconducting cuprate bilayers

机译：超导铜酸盐双层中铜-顶氧距离的反常膨胀

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摘要

We have introduced an improved x-ray phase-retrieval method with unprecedented speed of convergence and precision, and used it to determine with sub-Angstrom resolution the complete atomic structure of epitaxial La_(2-x)Sr_xCuO_4 ultrathin films. We focus on superconducting heterostructures built from constituent materials that are not superconducting in bulk samples. Single-phase metallic or superconducting films are also studied for comparison. The results show that this phase-retrieval diffraction method enables accurate measurement of structural modifications in near-surface layers, which may be critically important for elucidation of surface-sensitive experiments. Specifically we find that, while the copper-apical-oxygen distance remains approximately constant in single-phase films, it shows a dramatic increase from the metallic-insulating interface of the bilayer towards the surface by as much as 0.45 A. The apical-oxygen displacement is known to have a profound effect on the superconducting transition temperature.
机译：我们引入了一种改进的x射线相位检索方法，该方法具有前所未有的收敛速度和精确度，并用于以亚埃分辨率确定外延La_（2-x）Sr_xCuO_4超薄膜的完整原子结构。我们专注于由在大体积样品中不超导的组成材料构建的超导异质结构。还研究了单相金属或超导薄膜以进行比较。结果表明，这种相取回衍射方法能够精确测量近表面层中的结构修饰，这对于阐明表面敏感实验可能至关重要。具体而言，我们发现，虽然单相膜中的铜-顶氧距离保持近似恒定，但它显示出从双层的金属绝缘界面到表面的戏剧性的增加，最高可达0.45A。已知位移对超导转变温度有深远的影响。

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