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.

引用

页数：5

共 33 条

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