In transition-metal compounds, the transition-metal d electrons play an important role in their physical properties; however, the effects of the electron correlation between the ligand p electrons have not been clear yet. In this Letter, the Ru 4d and O 2p partial density of states (PDOS) in transition-metal oxide SrRuO3 involving Weyl fermions are investigated by resonant photoemission spectroscopy. The observations demonstrate that the O 2p PDOS is distorted from that predicted by first-principles calculations than the Ru 4d PDOS. The results indicate that the electron correlation in the ligand orbitals will be important to understand the electronic structure of the p-d hybridized state in strongly correlated electron systems, even with topological states.
@article{arxiv.2409.04062,
title = {Correlated Ligand Electrons in the Transition-Metal Oxide SrRuO$_3$},
author = {Yuichi Seki and Yuki K. Wakabayashi and Takahito Takeda and Kohdai Inagaki and Shin-ichi Fujimori and Yukiharu Takeda and Atsushi Fujimori and Yoshitaka Taniyasu and Hideki Yamamoto and Yoshiharu Krockenberger and Masaaki Tanaka and Masaki Kobayashi},
journal= {arXiv preprint arXiv:2409.04062},
year = {2025}
}