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首页> 外文期刊>Physical review >Influence of defect-induced biaxial strain on flux pinning in thick YBa_2Cu_3O_7 layers
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Influence of defect-induced biaxial strain on flux pinning in thick YBa_2Cu_3O_7 layers

机译:缺陷诱发的双轴应变对厚YBa_2Cu_3O_7层中通量钉扎的影响

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摘要

This work reports a detailed structural study by synchrotron x-ray diffraction of several sets of thick YBa_2Cu3O_7 layers. The samples represent recent advances in flux-pinning design, containing various concentrations of artificial pinning centers: (ⅰ) BaZrO_3 nanorods, (ⅱ) BaZrO_3 nanoparticles, and (ⅲ) Y_2O_3 nanoparticles. A statistical analysis was performed in order to separate the effects of defect-induced and intrinsic pinning. We report a statistically significant correlation between the orthorhombic distortion of the YBCO matrix and the pinning strength. Our result implies that the in-plane ordering of oxygen ions in the chain positions accounts for approximately 60% of the pinning force. The strain-induced pinning mechanism analysis, based on the Eshelby model of elastically strained composites, predicts that small YBCO grain size is a critical component of a strong pinning architecture that can enable critical current density values approaching the depairing limit.
机译:这项工作报告了通过同步加速器X射线衍射对几组厚YBa_2Cu3O_7层进行的详细结构研究。这些样品代表了通量钉扎设计的最新进展,其中包含各种浓度的人工钉扎中心:(ⅰ)BaZrO_3纳米棒,(ⅱ)BaZrO_3纳米颗粒和(ⅲ)Y_2O_3纳米颗粒。进行了统计分析,以区分由缺陷引起的钉扎和固有钉扎的影​​响。我们报告YBCO矩阵的正交畸变和钉扎强度之间的统计显着相关。我们的结果表明,在链位置上,氧离子的面内排序约占钉扎力的60%。基于弹性应变复合材料的Eshelby模型的应变诱导钉扎机制分析预测,小的YBCO晶粒尺寸是强大钉扎体系结构的关键组成部分,可以使临界电流密度值接近破损极限。

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  • 来源
    《Physical review》 |2012年第9期|p.094511.1-094511.5|共5页
  • 作者单位

    Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA;

    Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA;

    Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA;

    Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA;

    Air Force Research Laboratory, Wright-Patterson Air Force Base, Ohio 45433, USA;

    Air Force Research Laboratory, Wright-Patterson Air Force Base, Ohio 45433, USA;

    School of Physical Science and Technology, Soochow University, Suzhou 215006, China;

    Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA;

    Oak Ridge National Laboratory, Oak Ridge Tennessee 37831, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    cuprate superconductors (high-Tc and insulating parent compounds); critical currents; superconducting wires, fibers, and tapes;

    机译:铜酸盐超导体(高Tc和绝缘母体化合物);临界电流;超导线;纤维和胶带;

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