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We have grown single crystal samples of Co substituted CaFe2As2 using an FeAsflux and systematically studied the effects of annealing/quenching temperatureon the physical properties of these samples. Whereas the as-grown samples(quenched from 960C) all enter the collapsed tetragonal phase upon cooling,annealing/quenching temperatures between 350C and 800C can be used to tune thesystem to low temperature antiferromagnetic/orthorhomic or superconductingstates as well. The progression of the transition temperature versusannealing/quenching temperature (T-T$_{anneal}$) phase diagrams with increasingCo concentration shows that, by substituting Co, theantiferromagnetic/orthorhombic and the collapsed tetragonal phase lines areseparated and bulk superconductivity is revealed. We established a 3D phasediagram with Co concentration and annealing/quenching temperature as twoindependent control parameters. At ambient pressure, for modest x andT$_{anneal}$ values, the Ca(Fe1-xCox)2As2 system offers ready access to thesalient low temperature states associated with Fe-based superconductors:antiferromagnetic/orthorhombic, superconducting, and non-magnetic/collapsedtetragonal.

Control of magnetic, non-magnetic and superconducting states in annealed Ca(Fe$_{1-x}$Co$_{x}$)$_{2}$As$_{2}$