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Sr$_{2}$FeMoO$_6$ is a double perovskite compound, known for its hightemperature behavior. Combining different magnetic and spectroscopic tools, weshow that this compound can be driven to rare example of antiferromagneticmetallic state through heavy electron doping. Considering synthesis ofSr$_{2-x}$La$_x$FeMoO$_6$ (1.0 $\le{x}\le$ 1.5) compounds, we find compellingevidences of antiferromagnetic metallic ground state for $x\ge$1.4. The localstructural study on these compounds reveal unusual atomic scale phasedistribution in terms of La, Fe and Sr, Mo-rich regions driven by strong La-Ocovalency: a phenomenon hitherto undisclosed in double perovskites. The generaltrend of our findings are in agreement with theoretical calculations carriedout on realistic structures with the above mentioned local chemicalfluctuations, which reconfirms the relevance of the kinetic energy drivenmagnetic model.

Signature of an antiferromagnetic metallic ground state in heavily electron doped Sr2FeMoO6