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arXiv · 0903.2097

Anomalous Expansion of the Copper-Apical Oxygen Distance in Superconducting La$_{2}$CuO$_{4}$ - La$_{1.55}$Sr$_{0.45}$CuO$_{4}$ Bilayers

Hua Zhou·Yizhak Yacoby·Ron Pindak·Vladimir Butko·Gennady Logvenov·Ivan Bozovic
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Abstract

We have introduced an improved X-ray phase-retrieval method with unprecedented speed of convergence and precision, and used it to determine with sub-{\AA}ngstrom resolution the complete atomic structure of an ultrathin superconducting bilayer film, composed of La$_{1.55}$Sr$_{0.45}$CuO$_{4}$ and La$_{2}$CuO$_{4}$ neither of which is superconducting by itself. The results show that phase-retrieval diffraction techniques enable accurate measurement of structural modifications in near-surface layers, which may be critically important for elucidation of surface-sensitive experiments. Specifically we find that close to the sample surface the unit cell size remains constant while the copper-apical oxygen distance shows a dramatic increase, by as much as 0.45 {\AA}. The apical oxygen displacement is known to have a profound effect on the superconducting transition temperature.

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Hua Zhou, Yizhak Yacoby, Ron Pindak, Vladimir Butko, Gennady Logvenov, Ivan Bozovic. 2009-03-12. Anomalous Expansion of the Copper-Apical Oxygen Distance in Superconducting La$_{2}$CuO$_{4}$ - La$_{1.55}$Sr$_{0.45}$CuO$_{4}$ Bilayers. https://doi.org/10.1073/pnas.0914702107

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