%0 Journal Article
%A Puntel, Denny
%A Kutnyakhov, Dmytro
%A Wenthaus, Lukas
%A Scholz, Markus
%A Wind, Nils
%A Heber, Michael
%A Brenner, Günter
%A Gu, Genda
%A Cava, Robert J.
%A Bronsch, Wibke
%A Cilento, Federico
%A Parmigiani, Fulvio
%A Pressacco, Federico
%T Out-of-equilibrium charge redistribution in a copper-oxide based superconductor by time-resolved X-ray photoelectron spectroscopy
%J Scientific reports
%V 14
%N 1
%@ 2045-2322
%C [London]
%I Macmillan Publishers Limited, part of Springer Nature
%M PUBDB-2024-05578
%P 8775
%D 2024
%X Charge-transfer excitations are of paramount importance for understanding the electronic structure of copper-oxide based high-temperature superconductors. In this study, we investigate the response of a Bi<sub>2</sub>Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>8+δ</sub> crystal to the charge redistribution induced by an infrared ultrashort pulse. Element-selective time-resolved core-level photoelectron spectroscopy with a high energy resolution allows disentangling the dynamics of oxygen ions with different coordination and bonds thanks to their different chemical shifts. Our experiment shows that the O 1s component arising from the Cu–O planes is significantly perturbed by the infrared light pulse. Conversely, the apical oxygen, also coordinated with Sr ions in the Sr-O planes, remains unaffected. This result highlights the peculiar behavior of the electronic structure of the Cu–O planes. It also unlocks the way to study the out-of-equilibrium electronic structure of copper-oxide-based high-temperature superconductors by identifying the O 1s core-level emission originating from the oxygen ions in the Cu–O planes. This ability could be critical to gain information about the strongly-correlated electron ultrafast dynamical mechanisms in the Cu–O plane in the normal and superconducting phases.
%F PUB:(DE-HGF)16
%9 Journal Article
%$ 38627427
%U <Go to ISI:>//WOS:001207590500018
%R 10.1038/s41598-024-56440-4
%U https://bib-pubdb1.desy.de/record/613152