Prevailing Charge Order in Overdoped La2−xSrxCuO4 beyond the Superconducting Dome

Qizhi Li; Hsiao-Yu Huang; Tianshuang Ren; Eugen Weschke; Lele Ju; Changwei Zou; Shilong Zhang; Qingzheng Qiu; Jiarui Liu; Shuhan Ding; Amol Singh; Oleksandr Prokhnenko; Di-Jing Huang; Ilya Esterlis; Yao Wang; Yanwu Xie; Yingying Peng

doi:10.1103/PhysRevLett.131.116002

Prevailing Charge Order in Overdoped La2−xSrxCuO4 beyond the Superconducting Dome

Qizhi Li, Hsiao-Yu Huang, Tianshuang Ren, Eugen Weschke, Lele Ju, Changwei Zou, Shilong Zhang, Qingzheng Qiu, Jiarui Liu, Shuhan Ding, Amol Singh, Oleksandr Prokhnenko, Di-Jing Huang, Ilya Esterlis, Yao Wang, Yanwu Xie, Yingying Peng

DOI 10.1103/PhysRevLett.131.116002 · Physical Review Letters

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Abstract

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 L3-edge and O K-edge resonant x-ray scattering, we reveal a charge order (CO) correlation in overdoped La2−xSrxCuO4 (0.35≤x≤0.6) beyond the superconducting dome. This CO has a periodicity of ∼6 lattice units with correlation lengths of ∼20 lattice 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 the c direction 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La1.55Sr0.45CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2-xCaxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown