论文标题
基于LA的铜层中充电命令的命运
Fate of charge order in overdoped La-based cuprates
论文作者
论文摘要
在高温铜板超导体中，条纹顺序分别指旋转和电荷调制，分别为八个和四个晶格单元。这种条纹顺序如何在最佳掺杂中演变为一个有争议的问题。在这里，我们提出了对LA2-XSRXCUO4（LSCO）和LA1.8-XEU0.2SRXCUO4（LESCO）（LESCO）中弱电荷相关性弱电荷相关性研究的系统共振非弹性X射线散射（RIX）。超高能量分辨率实验证明了非弹性和弹性散射过程分离的重要性。增加掺杂X后，发现远距离温度依赖的条纹顺序被临界点XC = 0.15的短距离温度无关相关所取代，与pseudoGap临界掺杂不同。我们认为，掺杂和温度独立的短距离相关性源于未分辨的电子 - 音波耦合，这些耦合在条纹排序矢量上广泛峰值。在LSCO中，远程静态条纹顺序在最佳掺杂周围的量子临界点中消失。
In high-temperature cuprate superconductors, stripe order refers broadly to a coupled spin and charge modulation with a commensuration of eight and four lattice units, respectively. How this stripe order evolves across optimal doping remains a controversial question. Here we present a systematic resonant inelastic x-ray scattering (RIXS) study of weak charge correlations in La2-xSrxCuO4 (LSCO) and La1.8-xEu0.2SrxCuO4 (LESCO). Ultra high energy resolution experiments demonstrate the importance of the separation of inelastic and elastic scattering processes. Upon increasing doping x, the long-range temperature dependent stripe order is found to be replaced by short-range temperature independent correlations at a critical point xc = 0.15 distinct from the pseudogap critical doping. We argue that the doping and temperature independent short-range correlations originate from unresolved electron-phonon coupling that broadly peaks at the stripe ordering vector. In LSCO, long-range static stripe order vanishes in a quantum critical point around optimal doping.
