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首页> 外文期刊>Physical review >Nanoscale coherent intergrowthlike defects in a crystal of La_(1.9)Ca_(1.1)Cu_2O_(6+δ) made superconducting by high-pressure oxygen annealing
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Nanoscale coherent intergrowthlike defects in a crystal of La_(1.9)Ca_(1.1)Cu_2O_(6+δ) made superconducting by high-pressure oxygen annealing

机译:通过高压氧退火超导的La_(1.9)Ca_(1.1)Cu_2O_(6 +δ)晶体中的纳米级相干共生缺陷

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摘要

Superconductivity with T_c = 53.5 K has been induced in a large La_(1.9)Ca_(1.1)Cu_2O_6 (La-2126) single crystal by annealing in a high partial pressure of oxygen at 1200 ℃. Using transmission electron microscopy techniques, we show that a secondary Ca-doped La_2CuO_4 (La-214) phase, not present in the as-grown crystal, appears as a coherent intergrowthlike defect as a consequence of the annealing. A corresponding secondary superconducting transition near 13 K is evident in the magnetization measurement. Electron energy-loss spectroscopy reveals a pre-edge peak at the O-K edge in the superconducting La-2126 phase, which is absent in the as-grown crystal, confirming the hole doping by interstitial oxygen.
机译:通过在1200℃的高氧分压下退火,在大型La_(1.9)Ca_(1.1)Cu_2O_6(La-2126)单晶中诱发了T_c = 53.5 K的超导。使用透射电子显微镜技术,我们表明,退火后,未出现在生长的晶体中的次级Ca掺杂的La_2CuO_4(La-214)相表现为相干的共生缺陷。在磁化测量中,可以看到在13 K附近有相应的次级超导转变。电子能量损失谱显示在超导La-2126相的O-K边缘处有一个预边缘峰,该晶体在生长的晶体中不存在,从而证实了间隙氧对空穴的掺杂。

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  • 来源
    《Physical review》 |2014年第13期|134518.1-134518.4|共4页
  • 作者单位

    Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA,Intel Corporation, Folsom, California 95630, 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;

    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;

    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,Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, USA;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    microscopy of surfaces, interfaces, and thin films; electron energy loss spectroscopy;

    机译:表面;界面和薄膜的显微镜检查;电子能量损失谱;

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