标题： 在单轴应力下YBa$_{2}$Cu$_{3}$O$_{6+x}$中电荷密度波关联的共振X射线散射研究 显示英文标题

标题： Resonant x-ray scattering study of charge-density wave correlations in YBa$_{2}$Cu$_{3}$O$_{6+x}$ under uniaxial stress

摘要： 我们报道了对高温超导体YBa$_2$Cu$_3$O$_{6+x}$ (YBCO$_{6+x}$) 的脱孪生单晶在施加单轴应力时电荷密度波（CDW）关联的全面研究，该研究通过Cu$L_3$-边共振能量积分X射线散射（REXS）完成，样品的掺杂水平为$0.40 \leq x \leq 0.93$ (空穴掺杂水平$0.072 \leq p \leq 0.168$)。 我们证明单轴应力的影响强烈依赖于掺杂程度：准二维电荷密度波（CDW）在较大的空穴掺杂范围内（$0.45 \leq x \leq 0.80$）通过面内单轴应力得到增强，但在最欠掺杂和最佳掺杂的样品（$x = 0.40$和 0.93）中仅受到轻微影响，在这些样品中，CDW的相关长度最小。 仅在YBCO$_{6.50}$和 YBCO$_{6.67}$中观察到了由应力诱导的三维长程有序（3D）CDW。 3D CDW 的温度依赖性明确表明它与超导性之间存在强烈的竞争关系。 基于这里报道的系统性的应变、掺杂和温度相关的REXS测量结果，我们讨论了YBCO$_{6+x}$及其他铜氧化物中电荷有序与超导性之间的关系。 显示英文摘要

摘要： We report a comprehensive study of the uniaxial stress response of charge-density-wave (CDW) correlations in detwinned single crystals of the high temperature superconductor YBa$_2$Cu$_3$O$_{6+x}$ (YBCO$_{6+x}$) with $0.40 \leq x \leq 0.93$ (hole-doping levels $0.072 \leq p \leq 0.168$) by means of Cu $L_3$-edge resonant energy-integrated x-ray scattering (REXS). We show that the influence of uniaxial stress is strongly doping dependent: the quasi-two-dimensional CDW is enhanced by in-plane uniaxial stress in a wide hole doping range ($0.45 \leq x \leq 0.80$), but only barely affected in the most underdoped and optimally doped samples ($x = 0.40$ and 0.93), where the CDW correlation length is minimal. A stress-induced three-dimensionally long-range ordered (3D) CDW was observed only in YBCO$_{6.50}$ and YBCO$_{6.67}$. The temperature dependence of the 3D CDW clearly indicates a strong competition with superconductivity. Based on the systematic strain-, doping-, and temperature-dependent REXS measurements reported here, we discuss the relationship between charge order and superconductivity in YBCO$_{6+x}$ and other cuprates.