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Magnetic fluctuations in transition metal oxides are a subject of intensiveresearch because of the key role they are expected to play in the transitionfrom the Mott insulator to the unconventional metallic phase of thesematerials, and also as drivers of superconductivity. Despite much effort, aclear link between magnetic fluctuations and the insulator-to-metal transitionhas not yet been established. Here we report the discovery of a compelling linkbetween magnetic fluctuations and the insulator-to-metal transition inCa(Ir$_{1-x}$Ru$_{x}$)O$_{3}$ perovskites as a function of the dopingcoefficient x. We show that when the material turns from insulator to metal, ata critical value of x$\sim$ 0.3, magnetic fluctuations change their characterfrom antiferromagnetic, a Mott insulator phase, to ferromagnetic, an itinerantelectron state with Hund's orbital coupling. These results are expected to havewide-ranging implications for our understanding of the unconventionalproperties of strongly correlated electrons systems

Magnetic fluctuations driven insulator-to-metal transition in Ca(Ir$_{1-x}$Ru$_{x}$)O$_{3}$