Superconductivity in LaFe1-xCoxAsO

By A. Sefat, A. Huq, M. McGuire, R. Jin, B. Sales, D. Mandrus. 2008

183 citations recorded by the source corpus.

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

Subfields: Accounting, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/78a8e0c568197607f278aa0ec399188122440715