Abstract
Resonant and angle-resolved photoemission measurements were performed for the non-cuprate layered superconductor Sr 2RuO 4 ( T c = 0.93 K). Resonant valence band photoemission spectroscopy shows the existence of a correlation induced satellite to the main d band across the Ru 4 p-4 d 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 4 d-O 2 p 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 T c layered superconductor, just like the cuprates.
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