Renormalized behavior and proximity to a magnetic quantum critical point in BaCo${}_2$As${}_2$

Abstract

We report synthesis and single crystal measurements of magnetic, transport and thermal properties of single crystalline BaCo${}_2$As${}_2$ as well as first principles calculations of the electronic structure and magnetic behavior. These results show that BaCo${}_2$As${}_2$ is a highly renormalized paramagnet in proximity to a quantum critical point, presumably of ferromagnetic character and that BaFeNiAs${}_2$ behaves similarly. These results are discussed in relation to the properties of Ba(Fe,Co)${}_2$As${}_2$ and Ba(Fe,Ni)${}_2$As${}_2$, which are superconducting for low Co and Ni concentrations.

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• Electronic Structure of Fe-Based Superconductors
• Electronic structure and Magnetism in BaMn${}_2$As${}_2$ and BaMn${}_2$Sb${}_2$
• Itinerant antiferromagnetism in BaCr${}_2$As${}_2$
• Effects of cobalt doping and three-dimensionality in $BaF{e}_{2}A{s}_2$
• Electronic structure of BaCu${}_2$As${}_2$ and SrCu${}_2$As${}_2$: sp-band metals
• Electronic structure of Ba(Fe,Ru)2As2 and Sr(Fe,Ir)2As2 alloys
• Evolution of the bulk properties, structure, magnetic order, and superconductivity with Ni doping in CaFe2-xNixAs2
• The Electronic Phase Diagram of the Iron-based High Tc Superconductor Ba(Fe(1-x)Co(x))2As2 Under Hydrostatic Pressure (0 < x <0.099)
• Properties of KCo${}_2$As${}_2$ and Alloys with Fe and Ru: Density Functional Calculations