Prevailing Charge Order in Overdoped La2−xSrxCuO4 beyond the Superconducting Dome
Prevailing Charge Order in Overdoped La2−xSrxCuO4 beyond the Superconducting Dome
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超导穹顶外过掺杂 La2-xSrxCuO4 中普遍存在的电荷顺序
DOI：
10.1103/physrevlett.131.116002
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发表时间：
2023
影响因子：
8.6
通讯作者：
Ding, Shuhan
中科院分区：
文献类型：
--
作者：
Li, Qizhi;Huang, Hsiao-Yu;Ren, Tianshuang;Weschke, Eugen;Ju, Lele;Zou, Changwei;Zhang, Shilong;Qiu, Qingzheng;Liu, Jiarui;Ding, Shuhan
过度掺杂的铜酸盐通常被认为是没有奇异有序的费米液态金属，而掺杂不足的铜酸盐则是交织状态。与传统的认识相反，利用铜边和O边的共振X射线散射，我们揭示了超导穹顶外过掺杂()的电荷顺序(CO)关联。这种CO具有周期的平格单位，其关联长度为平格单位。它表现出与低掺杂铜酸盐的CO类似的面内动量、偏振依赖和色散激发，但它的最大强度沿方向不同，并持续到300K。这种CO关联不能用费米表面不稳定性来解释，它的起源还有待于理解。我们的结果表明，CO在过度掺杂的金属区域很普遍，需要重新评估过度掺杂的铜酸盐作为弱关联费米液体的图景。
The extremely overdoped cuprates are generally considered to be Fermi liquid metals without exotic orders, whereas the underdoped cuprates harbor intertwined states. Contrary to this conventional wisdom, using Cu-edge and O-edge resonant x-ray scattering, we reveal a charge order (CO) correlation in overdoped() beyond the superconducting dome. This CO has a periodicity oflattice units with correlation lengths oflattice units. It shows similar in-plane momentum and polarization dependence and dispersive excitations as the CO of underdoped cuprates, but its maximum intensity differs along thedirection and persists up to 300 K. This CO correlation cannot be explained by the Fermi surface instability and its origin remains to be understood. Our results suggest that CO is prevailing in the overdoped metallic regime and requires a reassessment of the picture of overdoped cuprates as weakly correlated Fermi liquids.