Renormalized behavior and proximity of BaCo2As2 to a magnetic quantum critical point

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

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109 Scopus citations

Abstract

We report synthesis and single-crystal measurements of magnetic, transport, and thermal properties of single crystalline BaCo2 As2 as well as first-principles calculations of the electronic structure and magnetic behavior. These results show that BaCo2 As2 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) 2 As2 and Ba (Fe,Ni) 2 As2, which are superconducting for low Co and Ni concentrations.

Original languageEnglish
Article number024512
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume79
Issue number2
DOIs
StatePublished - Jan 5 2009

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