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Magnetic field induced modification of superfluid density and interplane spectral weight in YBa_2Cu_3O_y

机译:磁场引起的YBa_2Cu_3O_y中超流体密度和面间谱重的改变

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摘要

We report on the interlayer infrared response of YBa_2Cu_O_Y in an applied magnetic field. This study explores both the underdoped (y=6.67 and 6.75) and optimally doped (y=6.95) regions of the phase diagram, and includes data for fields applied both parallel to the c axis and to the CuO_2 planes in this anisotropic superconductor. We focus on the transfer of optical conductivity spectral weight from high-frequency regions of the spectrum to the nondissipative superconducting condensate, and examine the effect of magnetic field upon this process. A sum-rule analysis reveals that magnetic fields H∥c eliminate the high-frequency contribution to the superfluid density, returning the system to a more BCS-like energy scale. For fields H∥CuO_2, however, the high-energy contribution scales with the superfluid density, and the anomalous scheme of condensate formation is maintained, at least in underdoped y = 6.67 and 6.75 samples. This behavior is discussed in relation to the change in electronic kinetic energy and shown to be closely related to the suppression of interplane phase coherence.
机译:我们报告了在施加磁场下YBa_2Cu_O_Y的层间红外响应。这项研究探索了相图的低掺杂区(y = 6.67和6.75)和最佳掺杂区(y = 6.95),并包括在各向异性超导体中平行于c轴和CuO_2平面施加的场的数据。我们专注于将光导率频谱权重从频谱的高频区域转移到非耗散超导冷凝物,并研究磁场对该过程的影响。求和规则分析表明,磁场H∥c消除了高频对超流体密度的影响,使系统返回到更像BCS的能级。然而,对于H∥CuO_2场,至少在y = 6.67和6.75掺杂不足的情况下,高能贡献随超流体密度而缩放,并且维持了冷凝物形成的异常方案。讨论了有关电子动能变化的行为,并证明它与抑制平面间相干性密切相关。

著录项

  • 来源
    《Physical review》 |2009年第10期|795-802|共8页
  • 作者单位

    Department of Physics, University of California, San Diego, La Jolla, California 92093, USA;

    Department of Physics, University of California, San Diego, La Jolla, California 92093, USA;

    Department of Physics, University of California, San Diego, La Jolla, California 92093, USA;

    Department of Physics, University of California, San Diego, La Jolla, California 92093, USA;

    Department of Physics, University of California, San Diego, La Jolla, California 92093, USA;

    Central Research Institute of the Electric Power Industry, Komae, Tokyo 201-8511, Japan Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japanrn;

    Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan;

    Department of Physics, University of California, San Diego, La Jolla, California 92093, USA;

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

    optical properties; magnetic properties; Y-based cuprates;

    机译:光学性能;磁性能;Y基铜酸盐;

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