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The magnetic, transport, and thermal properties of single crystals of theseries Fe(Ga1-xGex)3 are reported. Pure FeGa3 is a nonmagnetic semiconductor,that when doped with small concentrations of Ge (extrinsic electrons), passesthrough an insulator-to-metal transition and displays non-Fermi liquid (NFL)behavior. Moreover, we observer clear signatures of a ferromagnetic quantumcritical point (FM-QCP) in this system at x = 0.052. The mechanism of the localmoment formation is consistent with a one-electron reduction of Fe dimersinglets, a unique structural feature in FeGa3, where the density of thesemixed valence (Fe(III)-Fe(II)) dimers provides a unique tuning parameter ofquantum criticality.

Ferromagnetic Quantum Critical Point in FeGa3 Tuned by Mixed-Valence Fe Dimers