Correlated Ligand Electrons in the Transition-Metal Oxide <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi>SrRuO</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow></math>

Yuichi Seki; Yuki K. Wakabayashi; Takahito Takeda; Kohdai Inagaki; Shin-ichi Fujimori; Yukiharu Takeda; Atsushi Fujimori; Yoshitaka Taniyasu; Hideki Yamamoto; Yoshiharu Krockenberger; Masaaki Tanaka; Masaki Kobayashi

doi:10.1103/n9qh-6739

Correlated Ligand Electrons in the Transition-Metal Oxide ${SrRuO}_{3}$

Yuichi Seki¹, Yuki K. Wakabayashi ², Takahito Takeda ¹, Kohdai Inagaki¹, Shin-ichi Fujimori ³, Yukiharu Takeda³, Atsushi Fujimori ^3,5,6, Yoshitaka Taniyasu², Hideki Yamamoto ² et al.

Yoshiharu Krockenberger ², Masaaki Tanaka ^1,4,7, and Masaki Kobayashi ^1,4,*

¹Department of Electrical Engineering and Information Systems, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
²NTT Basic Research Laboratories, NTT Corporation, Atsugi, Kanagawa 243-0198, Japan
³Materials Sciences Research Center, Japan Atomic Energy Agency, Sayo-gun, Hyogo 679-5148, Japan
⁴Center for Spintronics Research Network, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
⁵Center for Quantum Technology and Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan
⁶Department of Physics, The University of Tokyo, Tokyo 133-0033, Japan
⁷Institute for Nano Quantum Information Electronics, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan

^*Contact author: masaki.kobayashi@ee.t.u-tokyo.ac.jp

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Phys. Rev. Lett. 135, 046402 – Published 25 July, 2025

DOI: https://doi.org/10.1103/n9qh-6739

Abstract

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 $Ru 4 d$ and $O 2 p$ partial density of states (PDOS) in transition-metal oxide ${SrRuO}_{3}$ involving Weyl fermions are investigated by resonant photoemission spectroscopy. The observations demonstrate that the $O 2 p$ PDOS is distorted from that predicted by first-principles calculations than the $Ru 4 d$ 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.

Physical Review Letters

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Correlated Ligand Electrons in the Transition-Metal Oxide ${SrRuO}_{3}$

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Correlated Ligand Electrons in the Transition-Metal Oxide SrRuO3

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Correlated Ligand Electrons in the Transition-Metal Oxide ${SrRuO}_{3}$