Superconductivity in LaFe1-xCoxAsO

被引：280

作者：

Sefat, Athena S. ^{[1
]}

Huq, Ashfia ^{[2
]}

McGuire, Michael A. ^{[1
]}

Jin, Rongying ^{[1
]}

Sales, Brian C. ^{[1
]}

Mandrus, David ^{[1
]}

Cranswick, Lachlan M. D. ^{[3
]}

Stephens, Peter W. ^{[4
]}

Stone, Kevin H. ^{[4
]}

机构：

[1] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA

[2] Oak Ridge Natl Lab, Neutron Scattering Sci Div, Oak Ridge, TN 37831 USA

[3] CNR, Canadian Neutron Beam Ctr, Chalk River, ON K0J 1J0, Canada

[4] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 10期

关键词：

D O I：

10.1103/PhysRevB.78.104505

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Here we report the synthesis and basic characterization of LaFe1-xCoxAsO for several values of x. The parent phase LaFeAsO orders antiferromagnetically (T-N approximate to 145 K). Replacing Fe with Co is expected both to electron dope and introduce disorder in the FeAs layer. For x=0.05 antiferromagnetic order is destroyed and superconductivity is observed at T-c(onset)=11.2 K. For x=0.11 superconductivity is observed at T-c(onset)=14.3 K and for x=0.15 it is observed at T-c(onset)=6.0 K. For x=1, and the material appears to be ferromagnetic as judged by magnetization measurements. We conclude that Co is an effective dopant to induce superconductivity. Somewhat surprisingly, the system appears to tolerate considerable disorder in the FeAs planes.

引用

页数：9