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CaCo$_{2-y}$As$_2$ is an unusual itinerant magnet with signatures of extrememagnetic frustration. The conditions for establishing magnetic order in suchitinerant frustrated magnets, either by reducing frustration or increasingelectronic correlations, is an open question. Here we use results frominelastic neutron scattering and magnetic susceptibility measurements anddensity functional theory calculations to show that hole doping inCa(Co$_{1-x}$Fe$_{x}$)$_{2-y}$As$_{2}$ suppresses magnetic order by quenchingthe magnetic moment while maintaining the same level of magnetic frustration.The suppression is due to tuning the Fermi energy away from a peak in theelectronic density of states originating from a flat conduction band. Thisresults in the complete elimination of the magnetic moment by $x\approx0.25$,providing a clear example of a Stoner-type transition.

Carrier Tuning of Stoner Ferromagnetism in ThCr$_{\mathbf{2}}$Si$_{\mathbf{2}}$-Structure Cobalt Arsenides