Localized character of charge excitations for La2-xSrxNi O4+δ revealed by oxygen K-edge resonant inelastic X-ray scattering

Kohei Yamagami, Kenji Ishii, Yasuyuki Hirata, Keisuke Ikeda, Jun Miyawaki, Yoshihisa Harada, Masanori Miyazaki, Shun Asano, Masaki Fujita, Hiroki Wadati

Research output: Contribution to journalArticlepeer-review

Abstract

We performed a resonant inelastic X-ray scattering (RIXS) study of La2-xSrxNiO4+δ (LSNO) at the oxygen K edge to investigate the nature of the doped holes with regard to charge excitations. Charge excitations of the hole-doped nickelates are found to be almost independent of momentum transfer, indicating that the doped holes are strongly localized in character. Additionally, conspicuous changes in energy position are in temperature dependence. These characters are observed in stark contrast to those of the high-Tc cuprate La2-xSrxCuO4 (LSCO), where delocalized doped holes form charge excitations with sizable momentum dependence in the CuO2 plane. This distinct nature of charge excitations of doped holes is consistent with the metallicity of the materials and could be caused by strong electron-phonon coupling and weak quantum spin fluctuation in the nickelates.

Original languageEnglish
Article number165145
JournalPhysical Review B
Volume102
Issue number16
DOIs
Publication statusPublished - 2020 Oct 23

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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