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The evolution of the electronic structure and magnetic properties with Cosubstitution for Fe in the solid solution Fe$_{1-x}$Co$_x$Ga$_3$ was studied bymeans of electrical resistivity, magnetization, ab-initio band structurecalculations, and nuclear spin-lattice relaxation $1/T_1$ of the $^{69,71}$Ganuclei. Temperature dependencies of the electrical resistivity reveal that theevolution from the semiconducting to the metallic state in theFe$_{1-x}$Co$_x$Ga$_3$ system occurs at $0.025<x<0.075$. The $^{69,71}(1/T_1)$was studied as a function of temperature in a wide temperature range of$2\!-\!300$ K for the concentrations $x = 0.0,$ $0.5,$ and $1.0$. In the parentsemiconducting compound FeGa$_3$, the temperature dependence of the$^{69}(1/T_1)$ exhibits a huge maximum at about $T\!\sim\!6$ K indicating theexistence of in-gap states. The opposite binary compound, CoGa$_3$,demonstrates a metallic Korringa behavior with $1/T_1$ $\propto T$. InFe$_{0.5}$Co$_{0.5}$Ga$_3$, the relaxation is strongly enhanced due to spinfluctuations and follows $1/T_1\propto T^{1/2}$, which is a unique feature ofweakly and nearly antiferromagnetic metals. This itinerant antiferromagneticbehavior contrasts with both magnetization measurements, showing localizedmagnetism with a relatively low effective moment of about 0.7 $\mu_B$/f.u., andab initio band structure calculations, where a ferromagnetic state with anordered moment of 0.5 $\mu_B$/f.u. is predicted. The results are discussed interms of the interplay betwen the localized and itinerant magnetizm includingin-gap states and spin fluctuations.

Interplay between localized and itinerant magnetism in Co substituted FeGa$_3$