Renormalized behavior and proximity to a magnetic quantum critical point in BaCo2As2
Abstract
We report synthesis and single crystal measurements of magnetic, transport and thermal properties of single crystalline BaCo2As2 as well as first principles calculations of the electronic structure and magnetic behavior. These results show that BaCo2As2 is a highly renormalized paramagnet in proximity to a quantum critical point, presumably of ferromagnetic character and that BaFeNiAs2 behaves similarly. These results are discussed in relation to the properties of Ba(Fe,Co)2As2 and Ba(Fe,Ni)2As2, which are superconducting for low Co and Ni concentrations.
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