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

被引：118
作者：
Sefat, A. S. [1 ]
Singh, D. J. [1 ]
Jin, R. [1 ]
McGuire, M. A. [1 ]
Sales, B. C. [1 ]
Mandrus, D. [1 ]
机构：
[1] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA
来源：
PHYSICAL REVIEW B | 2009年 / 79卷 / 02期
关键词：
barium compounds; cobalt compounds; critical points; density functional theory; electronic structure; ferromagnetic materials; iron compounds; magnetic transitions; magnetoresistance; materials preparation; nickel compounds; paramagnetic materials; proximity effect (superconductivity); renormalisation; specific heat; LAYERED SUPERCONDUCTOR;
D O I：
10.1103/PhysRevB.79.024512
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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)(2)As-2 and Ba(Fe,Ni)(2)As-2, which are superconducting for low Co and Ni concentrations.
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页数：5
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