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) 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 ∼3−20 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 cannot be explained by either the Fermi surface instability or the doped Hubbard model and its origin remains to be understood. Our results suggest that CO is prevailing in the overdoped metallic regime and superconductivity emerges out of the CO phase upon decreasing hole carriers.
@article{arxiv.2208.08634,
title = {Prevailing charge order in overdoped cuprates beyond the superconducting dome},
author = {Qizhi Li and Hsiao-Yu Huang and Tianshuang Ren and Eugen Weschke and Lele Ju and Changwei Zou and Shilong Zhang and Qingzheng Qiu and Jiarui Liu and Shuhan Ding and Amol Singh and Oleksandr Prokhnenko and Di-Jing Huang and Ilya Esterlis and Yao Wang and Yanwu Xie and Yingying Peng},
journal= {arXiv preprint arXiv:2208.08634},
year = {2023}
}