Abstract
Near-edge x-ray-absorption and photoemission spectra of the noncuprate superconductor ${\mathrm{Sr}}_{2}$Ru${\mathrm{O}}_{4}$ are presented. Holes close to the Fermi level are determined by Ru $4{d}_{\mathrm{xy}}$, $4{d}_{\mathrm{xz}}$, and $4{d}_{\mathrm{yz}}$ antibonding states. The density of the occupied states at the Fermi level derived from photoemission is higher than in the cuprates and these states have predominantly Ru $4d$ character. Angle-resolved photoemission yields a width of the occupied part of the conduction bands that is reduced by a factor of 2 in comparison to band-structure calculations. The importance of electron correlations is also evident in the appearance of screened final states in the Ru $3d$ core-level spectrum.
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