Correlated ligand electrons in the transition-metal oxide SrRuO 3

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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 4d and O 2p 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 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.
Funding Information
  • Japan Society for the Promotion of Science (19K21961)
  • Japan Society for the Promotion of Science (20H05650)
  • Japan Society for the Promotion of Science (22H04948)
  • Japan Society for the Promotion of Science (22K03535)
  • Core Research for Evolutional Science and Technology (JPMJCR1777)
  • Japan Science and Technology Agency
  • Center for Spintronics Research Network, Tohoku University
  • Japan Atomic Energy Agency (2022A-E23)
  • Ministry of Education, Culture, Sports, Science and Technology (JPMXP1222AE0031)
  • National Science and Technology Council (113-2112-M-007-033)
  • Ministry of Education
  • Japan Synchrotron Radiation Research Institute (2020A3841)

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