Superconductivity in LaFe1-x Cox AsO

Athena S. Sefat; Ashfia Huq; Michael A. McGuire; Rongying Jin; Brian C. Sales; David Mandrus; Lachlan M.D. Cranswick; Peter W. Stephens; Kevin H. Stone

doi:10.1103/PhysRevB.78.104505

Superconductivity in LaFe1-x Cox AsO

Athena S. Sefat, Ashfia Huq, Michael A. McGuire, Rongying Jin, Brian C. Sales, David Mandrus, Lachlan M.D. Cranswick, Peter W. Stephens, Kevin H. Stone

Correlated Electron Materials

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Abstract

Here we report the synthesis and basic characterization of LaFe1-x Cox AsO for several values of x. The parent phase LaFeAsO orders antiferromagnetically (TN 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 Tc onset =11.2 K. For x=0.11 superconductivity is observed at Tc onset =14.3 K and for x=0.15 it is observed at Tc 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.

Original language	English
Article number	104505
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	78
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevB.78.104505
State	Published - Sep 10 2008

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title = "Superconductivity in LaFe1-x Cox AsO",

abstract = "Here we report the synthesis and basic characterization of LaFe1-x Cox AsO for several values of x. The parent phase LaFeAsO orders antiferromagnetically (TN 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 Tc onset =11.2 K. For x=0.11 superconductivity is observed at Tc onset =14.3 K and for x=0.15 it is observed at Tc 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.",

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T1 - Superconductivity in LaFe1-x Cox AsO

AU - Sefat, Athena S.

AU - Huq, Ashfia

AU - McGuire, Michael A.

AU - Jin, Rongying

AU - Sales, Brian C.

AU - Mandrus, David

AU - Cranswick, Lachlan M.D.

AU - Stephens, Peter W.

AU - Stone, Kevin H.

PY - 2008/9/10

Y1 - 2008/9/10

N2 - Here we report the synthesis and basic characterization of LaFe1-x Cox AsO for several values of x. The parent phase LaFeAsO orders antiferromagnetically (TN 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 Tc onset =11.2 K. For x=0.11 superconductivity is observed at Tc onset =14.3 K and for x=0.15 it is observed at Tc 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.

AB - Here we report the synthesis and basic characterization of LaFe1-x Cox AsO for several values of x. The parent phase LaFeAsO orders antiferromagnetically (TN 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 Tc onset =11.2 K. For x=0.11 superconductivity is observed at Tc onset =14.3 K and for x=0.15 it is observed at Tc 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.

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Superconductivity in LaFe1-x Cox AsO

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