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We investigate the core level spectra of Ca(1-x)Sr(x)RuO(3) employing highresolution photoemission spectroscopy. Sample surface appears to be dominatedby the contributions from Ru-O layers. Sr 3p core level spectra are sharp andasymmetric in SrRuO(3) as expected in a metallic system, and exhibit multiplefeatures for the intermediate compositions that can be attributed to thedifference in Ca-O and Sr-O covalency. The Ru core level spectra exhibitdistinct signature of satellite features due to the finite electroncorrelations strength among Ru 4d electrons. The intensity of the satellitefeature is weaker in the surface spectra compared to the bulk. The lowtemperature spectra exhibit enhancement of satellite intensity in the spectracorresponding to ferromagnetic compositions due to the inter-site exchangecoupling induced depletion of the intensity at the Fermi level. The increase inx leads to a decrease in satellite intensity that has been attributed to theincrease in hopping interaction strength due to the enhancement of the Ru-O-Rubond angle. Evidently, the complex electronic properties of these materials arederived from the interplay between the electron correlation and hoppinginteraction strengths.

Complex electronic structure of Ca(1-x)Sr(x)RuO(3)