Differentiation of electron doping and oxygen reduction in the electron-doped cuprate Pr 1.3 − x La 0.7 Ce x CuO 4
Year: 2026
Type: article
Abstract: Electron-doped cuprates require not only electron doping by chemical substitution but also post-growth reduction annealing for realizing superconductivity. However, electron concentration can also be varied by reduction annealing, making it challenging to disentangle the respective influences of electron concentration and oxygen non-stoichiometry. Here, by combining alkali-metal dosing and angle-resolved photoemission spectroscopy, we monitored changes in the electronic structure of an electron-doped cuprate while supplying additional electrons to its surface without modifying oxygen content. Whereas a Fermi surface reconstruction due to long-range antiferromagnetic order was suppressed by alkali-metal deposition, the pseudogap -- which is associated with short-range spin/charge correlations and can be suppressed by efficient reduction annealing -- was found to persist. The results highlight significant contribution of impurity oxygen atoms to pseudogap formation in electron-doped cuprates.
DOI: 10.1103/zyzs-4p8p
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: Exploration of novel strongly correlated electronic states by dopant adsorption on Mott insulators, G8739678871, Unified elucidation of the genuine electronic state and the mechanism of superconductivity in cuprates with different coordination numbers, The effect of oxygen non-stoichiometry and true phase diagram of high-temperature superconductors studied by surface carrier doping
OpenAlex ID: W7157791148