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

A. S. Sefat; D. J. Singh; R. Jin; M. A. McGuire; B. C. Sales; D. Mandrus

doi:10.1103/PhysRevB.79.024512

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

Superconductivity 2009-01-22 v1

Authors: A. S. Sefat , D. J. Singh , R. Jin , M. A. McGuire , B. C. Sales , D. Mandrus

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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.

Keywords

BaCo2As2 quantum critical point renormalized paramagnet first principles calculations superconductivity

Cite

@article{arxiv.0811.2523,
  title  = {Renormalized behavior and proximity to a magnetic quantum critical point in BaCo$_2$As$_2$},
  author = {A. S. Sefat and D. J. Singh and R. Jin and M. A. McGuire and B. C. Sales and D. Mandrus},
  journal= {arXiv preprint arXiv:0811.2523},
  year   = {2009}
}

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

Abstract

Keywords

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