Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada. Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada.
Canadian Light Source, Saskatoon, Saskatchewan S7N 2V3, Canada.
Science. 2015 Mar 20;347(6228):1335-9. doi: 10.1126/science.1258399.
After the discovery of stripelike order in lanthanum-based copper oxide superconductors, charge-ordering instabilities were observed in all cuprate families. However, it has proven difficult to distinguish between unidirectional (stripes) and bidirectional (checkerboard) charge order in yttrium- and bismuth-based materials. We used resonant x-ray scattering to measure the two-dimensional structure factor in the superconductor YBa2Cu3O(6+y) in reciprocal space. Our data reveal the presence of charge stripe order (i.e., locally unidirectional density waves), which may represent the true microscopic nature of charge modulation in cuprates. At the same time, we find that the well-established competition between charge order and superconductivity is stronger for charge correlations across the stripes than along them, which provides additional evidence for the intrinsic unidirectional nature of the charge order.
在镧系铜氧化物高温超导体中发现条纹有序之后，所有铜酸盐家族中都观察到了电荷有序不稳定性。然而，在钇系和铋系材料中，区分单向（条纹）和双向（棋盘）电荷有序一直很困难。我们使用共振 x 射线散射在倒易空间中测量了超导体 YBa2Cu3O(6+y) 的二维结构因子。我们的数据揭示了电荷条纹有序（即局部单向密度波）的存在，这可能代表了铜酸盐中电荷调制的真实微观性质。同时，我们发现，电荷有序与超导性之间的竞争在跨越条纹的电荷相关方面比沿着条纹的更强，这为电荷有序的固有单向性质提供了额外的证据。
