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

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

2008-11-15

arxiv.org/abs/0811.2523v1

Phys. Rev. B 79, 024512 (2009)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.79.024512

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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