Presentation Information
[20a-C501-2]Partial Density of States via 4d – O 2p Hybridization Depending on the Orbital Characters in Strongly Correlated Ferromagnetic Metal Oxide SrRuO3
〇(M2)Yuichi Seki1, Yuki K. Wakabayashi2, Takahito Takeda1, Kohdai Inagaki1, Shin-ichi Fujimori3, Yukiharu Takeda3, Yoshitaka Taniyasu2, Hideki Yamamoto2, Yoshiharu Krockenberger2, Atsushi Fujimori4,5, Masaaki Tanaka1,6, Masaki Kobayashi1,6 (1.Grad. Sch. Eng. Univ. of Tokyo, 2.NTT Basic Res. Lab., 3.JAEA, 4.Dep. of Phys., Univ. of Tokyo, 5.National Tsing Hua Univ., 6.CSRN, Univ. of Tokyo)
Keywords:
strongly correlated systems,resonant photoemission spectroscopy
In perovskite transition metal oxides, the hybridization between the transition metal d and ligand O 2p plays an important role in the quantum physical properties. Here we report the Ru 4d and O 2p partial density of states (PDOS) observed by resonant photoemission spectroscopy at the Ru M2,3 and O K edges in ferromagnetic oxide SrRuO3 (SRO). In the Ru 4d-O 2p hybridized states near EF, the Ru 4d PDOS spectrum shows a prominent peak reflecting the coherent quasiparticle states, whereas the O 2p PDOS shows suppression of the intensity near EF suggesting less contribution to the coherent states. The different line shapes of these states indicate that the electron correlations depend on their orbital characteristics and the electron configurations including the charge transfer from the ligand. The O 2p PDOS spectrum implies the spin-selective charge transfer from the O 2p band and this explains the origin of the magnetic moments on the non-magnetic ligand O in SRO. The observation of the different PDOS in the p-d hybridized state suggests an incompleteness of previous understanding about the contribution of electrons in ligand elements to the electronic structure of the correlated materials.