1995
Angle-resolved and resonant photoemission study of Sr2RuO4
Journal of Physics and Chemistry of Solids
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- Volume
- 56
- Number
- 12
- First page
- 1885
- Last page
- 1886
- Language
- English
- Publishing type
- Research paper (scientific journal)
- DOI
- 10.1016/0022-3697(95)00193-X
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. © 1995.
- Link information
- ID information
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- DOI : 10.1016/0022-3697(95)00193-X
- ISSN : 0022-3697
- SCOPUS ID : 0029543724