Boschini F, Minola M, Sutarto R, Schierle E, Bluschke M, Das S, Yang Y, Michiardi M, Shao Y C, Feng X, Ono S, Zhong R D, Schneeloch J A, Gu G D, Weschke E, He F, Chuang Y D, Keimer B, Damascelli A, Frano A, da Silva Neto E H
Quantum Matter Institute, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada.
Department of Physics & Astronomy, University of British Columbia, Vancouver, BC, V6T 1Z1, Canada.
Nat Commun. 2021 Jan 26;12(1):597. doi: 10.1038/s41467-020-20824-7.
In strongly correlated systems the strength of Coulomb interactions between electrons, relative to their kinetic energy, plays a central role in determining their emergent quantum mechanical phases. We perform resonant x-ray scattering on BiSrCaCuO, a prototypical cuprate superconductor, to probe electronic correlations within the CuO plane. We discover a dynamic quasi-circular pattern in the x-y scattering plane with a radius that matches the wave vector magnitude of the well-known static charge order. Along with doping- and temperature-dependent measurements, our experiments reveal a picture of charge order competing with superconductivity where short-range domains along x and y can dynamically rotate into any other in-plane direction. This quasi-circular spectrum, a hallmark of Brazovskii-type fluctuations, has immediate consequences to our understanding of rotational and translational symmetry breaking in the cuprates. We discuss how the combination of short- and long-range Coulomb interactions results in an effective non-monotonic potential that may determine the quasi-circular pattern.
在强关联系统中，电子间库仑相互作用的强度相对于其动能，在决定其涌现的量子力学相方面起着核心作用。我们对典型的铜酸盐超导体BiSrCaCuO进行共振X射线散射，以探测CuO平面内的电子关联。我们在x-y散射平面中发现了一个动态准圆形图案，其半径与著名的静态电荷序的波矢大小相匹配。结合依赖于掺杂和温度的测量，我们的实验揭示了一幅电荷序与超导性相互竞争的图景，其中沿x和y方向的短程畴可以动态旋转到面内的任何其他方向。这种准圆形光谱是布拉佐夫斯基型涨落的一个标志，对我们理解铜酸盐中的旋转和平移对称性破缺有直接影响。我们讨论了短程和长程库仑相互作用的组合如何导致一个有效的非单调势，这可能决定了准圆形图案。
