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We studied the electronic structure of the Sr2RuO4 and SrRuO3 using O 1s X-ray absorption spectroscopy (XAS). The experimental spectra were interpreted in terms of the electronic states calculated using the LMTO method. For the SrRuO3 is presented a magnetic solution, however, for Sr2RuO4 a magnetic solution is not stable. In both compounds, the Ru 4d and O 2p states are heavily mixed, especially in the valence band region, while Sr 4d band are concentrated mostly in the conduction band. This indicates that the Sr presents a more ionic character within the structure, while the Ru and O present a more covalent character within the structure. The density of states showed that the bandwidth of the Ru 4d in the SrRuO3 is larger than in the Sr2RuO4 due to the major dispersion perpendicular to the planes. In the XAS spectra, the absorption intensity shows a good indication of covalence effects. The major differences between the Sr2RuO4 and SrRuO3 concern in the eg band, where, the eg band is shifted for minor energies in the Sr2RuO4 in relation to the SrRuO3. Also, the Sr 4d appears for smaller energy in the Sr2RuO4. m22.o01

O 1sX-ray absorption spectra of Sr2RuO4and SrRuO3

O 1sX-ray absorption spectra of Sr₂RuO₄and SrRuO₃