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首页> 外文期刊>Physical review >Scanning micro-x-ray diffraction unveils the distribution of oxygen chain nanoscale puddles in YBa_2Cu_3O_(6.33)
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Scanning micro-x-ray diffraction unveils the distribution of oxygen chain nanoscale puddles in YBa_2Cu_3O_(6.33)

机译：扫描微x射线衍射揭示了YBa_2Cu_3O_（6.33）中氧链纳米级水坑的分布

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摘要

Oxygen chain fragments are known to appear at the insulator-to-superconductor transition in YBa_2Cu_3O_(6+y). However, the self-organization and the size distribution of oxygen chain fragments are not known. Here, we seek to fill this gap, using scanning micro-x-ray diffraction, which is an imaging method based on advances in focusing a synchrotron radiation beam. This approach allows us to probe both real-space and k-space of high-quality YBa_2Cu_3O_(6.33) single crystals with T_c = 7 K. We report compelling evidence for nanoscale striped puddles, with Ortho-Ⅱ structure, made of chain fragments in the basal Cu(1) plane with local oxygen concentration y ≥ 0.5. The size of the Ortho-Ⅱ puddles spans a range between 2 and 9 nm. The real-space imaging of Ortho-Ⅱ puddles granular network shows that superconductivity, at a low hole-doping regime, occurs in a network of nanoscale oxygen ordered patches, interspersed with oxygen depleted regions. The manipulation by thermal treatments of the striped Ortho-Ⅱ puddles has been investigated focusing on the spontaneous symmetry breaking near the order-to-disorder phase transition at T_0 = 350 K.
机译：已知氧链片段会出现在YBa_2Cu_3O_（6 + y）的绝缘体到超导体过渡处。然而，氧链片段的自组织和尺寸分布是未知的。在这里，我们试图使用扫描微X射线衍射来填补这一空白，这是一种基于聚焦同步加速器辐射束进展的成像方法。这种方法使我们能够探查T_c = 7 K的高质量YBa_2Cu_3O_（6.33）单晶的实空间和k空间。我们报道了由Ortho-Ⅱ结构，由链状碎片组成的纳米级条纹水坑的令人信服的证据。局部氧浓度y≥0.5的基础Cu（1）平面。 Ortho-Ⅱ水坑的大小范围在2到9 nm之间。 Ortho-Ⅱ水坑颗粒网络的真实空间成像表明，在低空穴掺杂状态下，超导性发生在纳米级的氧有序斑块的网络中，散布着氧耗尽的区域。研究了条纹Ortho-Ⅱ水坑的热处理行为，重点研究了在T_0 = 350 K时有序到无序相变附近的自发对称性断裂。

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  • 来源
    《Physical review》 |2013年第1期|014517.1-014517.7|共7页
  • 作者

    Gaetano Campi; Alessandro Ricci; Nicola Poccia; Luisa Barba; Gianmichele Arrighetti; Manfred Burghammer; Alessandra Stella Caporale; Antonio Bianconi;

  • 作者单位

    Institute of Crystallography, CNR, via Salaria Km 29.300, Monterotondo Roma, 00015, Italy;

    Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, D-22607 Hamburg, Germany;

    MESA+ Institute for Nanotechnology, University of Twente, P. O. Box 217, 7500AE Enschede, Netherlands;

    Elettra Sincrotrone Trieste. Strada Statale 14 - km 163, 5, AREA Science Park, 34149 Basovizza, Trieste, Italy;

    Elettra Sincrotrone Trieste. Strada Statale 14 - km 163, 5, AREA Science Park, 34149 Basovizza, Trieste, Italy;

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

    RICMASS Rome International Center for Materials Science Superstripes, via dei Sabelli 119A, 00185 Roma, Italy;

    Institute of Crystallography, CNR, via Salaria Km 29.300, Monterotondo Roma, 00015, Italy,RICMASS Rome International Center for Materials Science Superstripes, via dei Sabelli 119A, 00185 Roma, Italy,Department of Physics, Sapienza University of Rome, 00185 Rome, Italy;

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