Doping-dependent charge order correlations in electron-doped cuprates.
Doping-dependent charge order correlations in electron-doped cuprates.
复制标题
DOI：
10.1126/sciadv.1600782
复制
发表时间：
2016-08
期刊：
影响因子：
13.6
通讯作者：
Damascelli A
中科院分区：
文献类型：
--
作者：
da Silva Neto EH;Yu B;Minola M;Sutarto R;Schierle E;Boschini F;Zonno M;Bluschke M;Higgins J;Li Y;Yu G;Weschke E;He F;Le Tacon M;Greene RL;Greven M;Sawatzky GA;Keimer B;Damascelli A
共振x射线散射阐明了n掺杂铜氧化物中电荷有序与磁性/超导性之间的联系。理解电荷序（CO）和其他现象（例如，赝能隙，反铁磁性和超导性）之间的相互作用是铜氧化物高温超导体的核心问题之一。发现类似形式的CO存在于空穴和电子掺杂的铜酸盐中，开辟了一条道路，以确定CO现象的哪一个子集对所有的铜酸盐都是普遍的。我们使用共振X射线散射测量电子掺杂铜氧化物（La 2 − xCexCuO 4和Nd 2 − xCexCuO 4）中的CO相关性及其与反铁磁性、赝能隙和超导性的关系。对Nd 2 − xCexCuO 4的详细测量表明，CO存在于x = 0.059到0.166的范围内，其掺杂依赖的波矢与费米面直线段之间的分离一致。CO的起始温度在x = 0.106和0.166之间是最高的，但在较低的掺杂水平下降低，这表明它与反铁磁相关性或赝能隙的出现无关。接近最佳掺杂，其中CO波矢量也与先前观察到的声子异常一致，低于和高于超导转变温度，或在磁场中的CO的测量，表明CO是不敏感的超导性。总体而言，这些研究结果表明，虽然在电子掺杂的铜酸盐中得到验证，但材料相关的细节决定了CO相关性是否获得足够的强度来竞争铜酸盐的基态。
Resonant x-ray scattering clarifies the link between charge order and magnetism/superconductivity in n-doped cuprates. Understanding the interplay between charge order (CO) and other phenomena (for example, pseudogap, antiferromagnetism, and superconductivity) is one of the central questions in the cuprate high-temperature superconductors. The discovery that similar forms of CO exist in both hole- and electron-doped cuprates opened a path to determine what subset of the CO phenomenology is universal to all the cuprates. We use resonant x-ray scattering to measure the CO correlations in electron-doped cuprates (La2−xCexCuO4 and Nd2−xCexCuO4) and their relationship to antiferromagnetism, pseudogap, and superconductivity. Detailed measurements of Nd2−xCexCuO4 show that CO is present in the x = 0.059 to 0.166 range and that its doping-dependent wave vector is consistent with the separation between straight segments of the Fermi surface. The CO onset temperature is highest between x = 0.106 and 0.166 but decreases at lower doping levels, indicating that it is not tied to the appearance of antiferromagnetic correlations or the pseudogap. Near optimal doping, where the CO wave vector is also consistent with a previously observed phonon anomaly, measurements of the CO below and above the superconducting transition temperature, or in a magnetic field, show that the CO is insensitive to superconductivity. Overall, these findings indicate that, although verified in the electron-doped cuprates, material-dependent details determine whether the CO correlations acquire sufficient strength to compete for the ground state of the cuprates.