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Subgap structures and pseudogap in cuprate superconductors: Role of density waves

机译:铜酸盐超导体中的亚间隙结构和伪间隙:密度波的作用

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摘要

In scanning tunneling microscopy conductance curves, the superconducting gap of cuprates is sometimes accompanied by small subgap structures at very low energy. This was documented early on near vortex cores and. later at zero magnetic field. Using mean-field toy models of coexisting d-wave superconductivity, d-form-factor density wave, and extended s-wave pair density wave (s'PDW), we find agreement with this phenomenon, with s'PDW playing a critical role. We explore the high variability of the gap structure with changes in band structure and density wave (DW) wave vector, thus explaining why subgap structures may not be a universal feature in cuprates. In the absence of nesting, nonsuperconducting results never show signs of pseudogap, even for large density wave magnitudes, therefore reinforcing the idea of a distinct origin for the pseudogap, beyond mean-field theory. Therefore, we also briefly consider the effect of DWs on a preexisting pseudogap.
机译:在扫描隧道显微镜电导曲线中,铜酸盐的超导间隙有时伴随着很小的亚能隙结构,能量非常低。早在近旋涡核和上有记载。后来在零磁场下。使用共存的d波超导性,d形状因数密度波和扩展s波对密度波(s'PDW)的均场玩具模型,我们发现与这种现象相吻合,其中s'PDW发挥了关键作用。我们探索带结构和密度波(DW)波矢量变化的间隙结构的高变异性,从而解释了为什么亚间隙结构可能不是铜酸盐中的普遍特征。在没有嵌套的情况下,即使对于大的密度波幅度,非超导结果也永远不会显示伪间隙的迹象,因此,除了平均场理论之外,还强化了伪间隙独特起源的想法。因此,我们还简要地考虑了DW对预先存在的伪间隙的影响。

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  • 来源
    《Physical review》 |2017年第5期|054518.1.505518.12|共1页
  • 作者单位

    Département de Physique, Université de Sherbrooke, Québec, Canada J1K2R1;

    Département de Physique, Université de Sherbrooke, Québec, Canada J1K2R1;

    Département de Physique, Université de Sherbrooke, Québec, Canada J1K2R1;

    Département de Physique, Université de Sherbrooke, Québec, Canada J1K2R1;

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