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

arXiv:0811.2523·cond-mat.supr-con·January 22, 2009

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

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TL;DR

This study investigates BaCo$_2$As$_2$, revealing it as a highly renormalized paramagnet near a ferromagnetic quantum critical point, with implications for related superconducting materials.

Contribution

The paper combines experimental measurements and first principles calculations to characterize the magnetic and electronic properties of BaCo$_2$As$_2$ and its proximity to a quantum critical point.

Findings

01

BaCo$_2$As$_2$ is a highly renormalized paramagnet.

02

It is near a ferromagnetic quantum critical point.

03

Similar behavior observed in BaFeNiAs$_2$.

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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