Angle-resolved photoemission study of Sr2RuO4

Takayoshi Yokoya, A. Chainani, T. Takahashi, H. Ding, J. C. Campuzano, H. Katayama-Yoshida, M. Kasai, Y. Tokura

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

We present high-resolution (HR) angle-resolved photoemission spectroscopy (ARPES) measurements of the noncuprate layered perovskite superconductor Sr2RuO4. ARPES spectra of the whole valence-band region obtained along two high-symmetry directions in the Brillouin zone show clear dispersion, generally similar to that of a band calculation. However, HRARPES measurements taken in the vicinity of the Fermi level (EF) show narrower Ru4dε(xy,yz,zx)-O2pπ antibonding bands than those predicted by the band calculation. More significantly, there is an extended van Hove singularity very close to EF (EB = 11 meV) along the Ru-O bonding direction, which is known to exist in cuprate high-temperature superconductors. The Fermi-surface topology obtained by HRARPES (one electronlike Fermi surface sheet centered at the Γ point and two holelike sheets centered at the X point) is different from the band calculation (two electronlike sheets centered at the Γ point and one holelike sheet centered at the X point), although the electron count is the same in both cases. These results suggest that electron-electron correlations cause the modification of the Fermi-surface topology, and is thus necessary for understanding the electronic structure and properties of Sr2RuO4.

Original languageEnglish
Pages (from-to)13311-13318
Number of pages8
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume54
Issue number18
Publication statusPublished - Nov 1 1996
Externally publishedYes

Fingerprint

Fermi surface
Photoemission
photoelectric emission
Photoelectron spectroscopy
Fermi surfaces
Topology
Electron correlations
High temperature superconductors
Electrons
Valence bands
Fermi level
Electronic properties
topology
Perovskite
Superconducting materials
Electronic structure
electrons
trucks
Brillouin zones
high temperature superconductors

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Yokoya, T., Chainani, A., Takahashi, T., Ding, H., Campuzano, J. C., Katayama-Yoshida, H., ... Tokura, Y. (1996). Angle-resolved photoemission study of Sr2RuO4. Physical Review B - Condensed Matter and Materials Physics, 54(18), 13311-13318.

Angle-resolved photoemission study of Sr2RuO4. / Yokoya, Takayoshi; Chainani, A.; Takahashi, T.; Ding, H.; Campuzano, J. C.; Katayama-Yoshida, H.; Kasai, M.; Tokura, Y.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 54, No. 18, 01.11.1996, p. 13311-13318.

Research output: Contribution to journalArticle

Yokoya, T, Chainani, A, Takahashi, T, Ding, H, Campuzano, JC, Katayama-Yoshida, H, Kasai, M & Tokura, Y 1996, 'Angle-resolved photoemission study of Sr2RuO4', Physical Review B - Condensed Matter and Materials Physics, vol. 54, no. 18, pp. 13311-13318.
Yokoya T, Chainani A, Takahashi T, Ding H, Campuzano JC, Katayama-Yoshida H et al. Angle-resolved photoemission study of Sr2RuO4. Physical Review B - Condensed Matter and Materials Physics. 1996 Nov 1;54(18):13311-13318.
Yokoya, Takayoshi ; Chainani, A. ; Takahashi, T. ; Ding, H. ; Campuzano, J. C. ; Katayama-Yoshida, H. ; Kasai, M. ; Tokura, Y. / Angle-resolved photoemission study of Sr2RuO4. In: Physical Review B - Condensed Matter and Materials Physics. 1996 ; Vol. 54, No. 18. pp. 13311-13318.
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N2 - We present high-resolution (HR) angle-resolved photoemission spectroscopy (ARPES) measurements of the noncuprate layered perovskite superconductor Sr2RuO4. ARPES spectra of the whole valence-band region obtained along two high-symmetry directions in the Brillouin zone show clear dispersion, generally similar to that of a band calculation. However, HRARPES measurements taken in the vicinity of the Fermi level (EF) show narrower Ru4dε(xy,yz,zx)-O2pπ antibonding bands than those predicted by the band calculation. More significantly, there is an extended van Hove singularity very close to EF (EB = 11 meV) along the Ru-O bonding direction, which is known to exist in cuprate high-temperature superconductors. The Fermi-surface topology obtained by HRARPES (one electronlike Fermi surface sheet centered at the Γ point and two holelike sheets centered at the X point) is different from the band calculation (two electronlike sheets centered at the Γ point and one holelike sheet centered at the X point), although the electron count is the same in both cases. These results suggest that electron-electron correlations cause the modification of the Fermi-surface topology, and is thus necessary for understanding the electronic structure and properties of Sr2RuO4.

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