Abstract
We report investigations of the effect of electron doping in FeGa3 via electric resistivity, specific heat and magnetic susceptibility measurements in single crystals. FeGa3 is a non-magnetic small gap semiconductor (Δ ~ 0.3-0.4 eV). Low concentration of Co in FeGa3 induces a crossover to a metallic-like behavior, also creating weakly coupled local moments. Electronic specific heat and resistivity suggest a mass enhancement of charge carriers. Thus, the low carrier density metal formed by doping FeGa3 presents some physical properties that resemble heavy fermion metals.
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