Angle-resolved and resonant photoemission study of Sr2RuO4

T. Yokoya, A. Chainani, T. Takahashi, H. Katayama-Yoshida, M. Kasai, Y. Tokura

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2 Citations (Scopus)

Abstract

Resonant and angle-resolved photoemission measurements were performed for the non-cuprate layered superconductor Sr2RuO4 (Tc = 0.93 K). Resonant valence band photoemission spectroscopy shows the existence of a correlation induced satellite to the main d band across the Ru 4p-4d threshold. Angle-resolved measurements show a surprisingly narrow band of about 50 meV width and positioned at 26 meV below the Fermi level, along the ΓX and ΓZ directions. This band, arising fom Ru 4d-O 2p antibonding states, is nearly dispersionless over a wide range of k points about the zone boundary along the Γ-Z direction (Ru-O direction), reminiscent of the extended Van-Hove singularity observed in the cuprates. The results emphasize the presence of strong correlations, substantial charge-transfer character to states at the Fermi level and the existence of a singular flat band near the Fermi-level in this low Tc layered superconductor, just like the cuprates.

Original languageEnglish
Pages (from-to)1885-1886
Number of pages2
JournalJournal of Physics and Chemistry of Solids
Volume56
Issue number12
DOIs
Publication statusPublished - Dec 1995
Externally publishedYes

Keywords

  • Non-cuprate layered superconductor
  • SrRuO
  • Van-Hove singularity
  • angle-resolved photoemission
  • charge-transfer character
  • resonant photoemission
  • strong correlations

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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    Yokoya, T., Chainani, A., Takahashi, T., Katayama-Yoshida, H., Kasai, M., & Tokura, Y. (1995). Angle-resolved and resonant photoemission study of Sr2RuO4. Journal of Physics and Chemistry of Solids, 56(12), 1885-1886. https://doi.org/10.1016/0022-3697(95)00193-X