von Arx K, Wang Qisi, Mustafi S, Mazzone D G, Horio M, Mukkattukavil D John, Pomjakushina E, Pyon S, Takayama T, Takagi H, Kurosawa T, Momono N, Oda M, Brookes N B, Betto D, Zhang W, Asmara T C, Tseng Y, Schmitt T, Sassa Y, Chang J
Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland.
Department of Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden.
NPJ Quantum Mater. 2023;8(1):7. doi: 10.1038/s41535-023-00539-w. Epub 2023 Jan 19.
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 study of weak charge correlations in LaSrCuO and LaEuSrCuO. Ultra high energy resolution experiments demonstrate the importance of the separation of inelastic and elastic scattering processes. Long-range temperature-dependent stripe order is only found below optimal doping. At higher doping, short-range temperature-independent correlations are present up to the highest doping measured. This transformation is distinct from and preempts 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 LaSrCuO, long-range static stripe order vanishes around optimal doping and we discuss both quantum critical and crossover scenarios.
在高温铜酸盐超导体中，条纹序广义上指的是一种自旋和电荷的耦合调制，其分别与八个和四个晶格单元具有公度性。这种条纹序在最佳掺杂范围内如何演变仍是一个有争议的问题。在此，我们展示了对LaSrCuO和LaEuSrCuO中弱电荷关联的系统共振非弹性X射线散射研究。超高能量分辨率实验证明了区分非弹性和弹性散射过程的重要性。长程温度依赖的条纹序仅在低于最佳掺杂时被发现。在更高的掺杂水平下，直到所测量的最高掺杂，都存在与温度无关的短程关联。这种转变与赝能隙临界掺杂不同且先于它出现。我们认为，与掺杂和温度无关的短程关联源自未解决的电子 - 声子耦合，其在条纹序向量处大致达到峰值。在LaSrCuO中，长程静态条纹序在最佳掺杂附近消失，我们讨论了量子临界和交叉情形。
