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We present a detailed study of the electronic and magnetic ground stateproperties of Fe$_{1-x}$Co$_{x}$Si using a combination of macroscopic andmicroscopic experimental techniques. From these experiments we quantitativelycharacterize the metal-insulator transition and magnetic/non-magnetic quantumphase transition occurring at low doping levels in Fe$_{1-x}$Co$_{x}$Si. Fromour study, we find a surprising closeness of the critical composition of themetal-insulator transition at $x_{\mathrm{MIT}} = 0.014$ and the quantum phasetransition at $x_{\mathrm{LRO}} \sim 0.024-0.031$. It suggests that theseeffects are cooperative and depend on each other.

Near coincidence of metal-insulator transition and quantum critical fluctuations: Electronic ground state and magnetic order in Fe$_{1-x}$Co$_{x}$Si