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The effect of doping on the electronic structure at the Mn sites in theLa_{1-x}Sr_{1+x}MnO_4 series (x=0, 0.3 and 0.5) was studied by means ofnon-resonant hard X- ray emission spectroscopy (XES). We observe a lineardichroism in the Mn K-beta main lines (3p to 1s transitions) that is strongestfor x=0 and decreases with increasing x to 0.5. The Mn K-beta main lines in thepoly-crystalline samples change considerably less upon increasing the holedoping (substitution of La by Sr) than it would be expected based on the changeof formal valence. From this we conclude that the charge and spin density atthe Mn sites are only little affected by doping. This implies that holesinjected in the La_{1-x}Sr_{1+x}MnO_4 series mainly result in a decrease ofcharge density on the oxygen atoms, i.e. oxygen takes part in the chargebalancing. These findings are supported by many-body cluster calculations.

A hard X- ray probe to study doping-dependent electron redistribution and strong covalency in La_{1-x}Sr_{1+x}MnO_4