TY  - JOUR
AU  - Puntel, Denny
AU  - Kutnyakhov, Dmytro
AU  - Wenthaus, Lukas
AU  - Scholz, Markus
AU  - Wind, Nils
AU  - Heber, Michael
AU  - Brenner, Günter
AU  - Gu, Genda
AU  - Cava, Robert J.
AU  - Bronsch, Wibke
AU  - Cilento, Federico
AU  - Parmigiani, Fulvio
AU  - Pressacco, Federico
TI  - Out-of-equilibrium charge redistribution in a copper-oxide based superconductor by time-resolved X-ray photoelectron spectroscopy
JO  - Scientific reports
VL  - 14
IS  - 1
SN  - 2045-2322
CY  - [London]
PB  - Macmillan Publishers Limited, part of Springer Nature
M1  - PUBDB-2024-05578
SP  - 8775
PY  - 2024
AB  - 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.
LB  - PUB:(DE-HGF)16
C6  - 38627427
UR  - <Go to ISI:>//WOS:001207590500018
DO  - DOI:10.1038/s41598-024-56440-4
UR  - https://bib-pubdb1.desy.de/record/613152
ER  -