Physics – Condensed Matter – Superconductivity
Scientific paper
2008-07-04
Phys. Rev. B 78, 104505 (2008)
Physics
Condensed Matter
Superconductivity
19 pages, 9 figures
Scientific paper
10.1103/PhysRevB.78.104505
Here we report the synthesis and basic characterization of LaFe1-xCoxAsO for several values of x. The parent phase LaFeAsO orders antiferromagnetically (TN ~ 145 K). Replacing Fe with Co is expected to both electron dope the system and introduce disorder in the FeAs layer. For x = 0.05 antiferromagnetic order is destroyed and superconductivity is observed at Tconset = 11.2 K. For x = 0.11 superconductivity is observed at Tc(onset) = 14.3 K, and for x = 0.15 Tc = 6.0 K. Superconductivity is not observed for x = 0.2 and 0.5, but for x = 1, the material appears to be ferromagnetic (Tc ~ 56 K) 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.
Huq Ashfia
Jin Rongying
Mandrus David
McGuire Michael A.
Sales Brian C.
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