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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Optimum inhomogeneity of local lattice distortions in La_2CuO_(4+y)
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Optimum inhomogeneity of local lattice distortions in La_2CuO_(4+y)

机译：La_2CuO_（4 + y）中局部晶格畸变的最佳不均匀性

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摘要

Electronic functionalities in materials from silicon to transition metal oxides are, to a large extent controlled by defects and their relative arrangement. Outstanding examples are the oxides of copper, where defect order is correlated with their high superconducting transition temperatures. The oxygen defect order can be highly inhomogeneous, even in optimal superconducting samples, which raises the question of the nature of the sample regions where the order does not exist but which nonetheless form the "glue" binding the ordered regions together. Here we use scanning X-ray microdiff raction (with a beam 300 nm in diameter) to show that for La_2CuO_(4+y), the glue regions contain incommensurate modulated local lattice distortions, whose spatial extent is most pronounced for the best superconducting samples. For an underdoped single crystal with mobile oxygen interstitials in the spacer La_2CuO_(4+y) layers intercalated between the CuO_2 layers, the incommensurate modulated local lattice distortions form droplets anticorrelated with the ordered oxygen interstitials, and whose spatial extent is most pronounced for the best superconducting samples. In this simplest of high temperature superconductors, there are therefore not one, but two networks of ordered defects which can be tuned to achieve optimal superconductivity. For a given stoichiometry, the highest transition temperature is obtained when both the ordered oxygen and lattice defects form fractal patterns, as opposed to appearing in isolated spots. We speculate that the relationship between material complexity and superconducting transition temperature T_c is actually underpinned by a fundamental relation between T_c and the distribution of ordered defect networks supported by the materials.
机译：从硅到过渡金属氧化物的材料中的电子功能在很大程度上受缺陷及其相对排列的控制。杰出的例子是铜的氧化物，其缺陷顺序与它们的高超导转变温度相关。氧缺陷的顺序甚至在最佳的超导样品中也可能是高度不均匀的，这就提出了样品区域的性质的问题，在这些样品区域中，该顺序不存在，但是形成了将有序区域粘合在一起的“胶水”。在这里，我们使用扫描X射线微衍射（直径为300 nm的光束）显示，对于La_2CuO_（4 + y），胶水区域包含不相称的调制局部晶格畸变，其空间范围对于最佳超导样品最为明显。对于在隔层La_2CuO_（4 + y）层之间插入CuO_2层之间具有活动氧间隙的掺杂不足的单晶，不相称的调制局部晶格畸变会形成与有序氧间隙反相关的液滴，并且其空间范围最明显超导样品。因此，在这种最简单的高温超导体中，没有一个，而是两个有序缺陷网络，可以对其进行调整以获得最佳超导性。对于给定的化学计量，与有序氧和晶格缺陷都形成分形图案（而不是出现在孤立的斑点中）相反，可以获得最高的转变温度。我们推测，材料复杂度与超导转变温度T_c之间的关系实际上是由T_c与材料所支持的有序缺陷网络分布之间的基本关系所支撑的。

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    Nicola Poccia; Alessandro Ricci; aetano Campi; Michela Fratini; Alessandro Puri; Daniele Di Gioacchino; Augusto Marcelli; Michael Reynolds; Manfred Burghammer; Naurang Lal Saini; Gabriel Aeppli; Antonio Bianconi;

  • 作者单位

    Department of Physics, Sapienza University of Rome, Piazzale A. Moro 2, 00185 Roma, Italy,European Synchrotron Radiation Facility, B.P. 220, F-38043 Grenoble Cedex, France;

    Department of Physics, Sapienza University of Rome, Piazzale A. Moro 2, 00185 Roma, Italy,Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, D-22607 Hamburg, Germany;

    Institute of Crystallography, CNR, Via Salaria Km 29.300, Monterotondo Stazione, Roma 1-00015, Italy;

    Department of Physics, Sapienza University of Rome, Piazzale A. Moro 2, 00185 Roma, Italy,Fermi Center, Piazzale del Viminale, 00187 Roma, Italy;

    Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, P.O. Box 13, 00044 Frascati, Italy;

    Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, P.O. Box 13, 00044 Frascati, Italy;

    Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, P.O. Box 13, 00044 Frascati, Italy;

    European Synchrotron Radiation Facility, B.P. 220, F-38043 Grenoble Cedex, France;

    European Synchrotron Radiation Facility, B.P. 220, F-38043 Grenoble Cedex, France;

    Department of Physics, Sapienza University of Rome, Piazzale A. Moro 2, 00185 Roma, Italy;

    London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, 17-19 Gordon Street, London WC1H 0AH, United Kingdom;

    Department of Physics, Sapienza University of Rome, Piazzale A. Moro 2, 00185 Roma, Italy,Rome International Centre for Materials Science Superstripes (RICMASS), Via dei Sabelli 119A, 00185 Roma, Italy,Mediterranean Institute of Fundamental Physics, Via Appia Nuova 31, 00040 Marino, Italy;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    granular superconductors; multiband superconductivity in density wave metals; scale-free heterogeneity; imaging phase separation; X-ray illumination;

    机译：粒状超导体;密度波金属中的多波段超导性;无尺度异质性成像相分离;X射线照明;

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