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We have investigated the electronic and magnetic properties of Co$_{1-{\rmx}}$Fe$_{\rm x}$Sb$_{3}$ skutterudites from density functional theory and MonteCarlo simulations. We find that above a certain threshold in the Feconcentration, somewhere between x=0.125 and x=0.25, Co$_{1-{\rm x}}$Fe$_{\rmx}$Sb$_{3}$ is ferromagnetic with an atomic moment which increasesasymptotically towards about 1 $\mu_{B}$/Fe and a non-zero Curie temperaturewhich reaches 70 K for FeSb$_{3}$. Ferromagnetism is favored due to a Stonerinstability in the electronic structure, where a large density of states at theFermi-level makes it favorable to form the ferromagnetic ground state.

Magnetism in Co$_{1-{\rm x}}$Fe$_{\rm x}$Sb$_{3}$ skutterudites from density functional theory