Superconductivity in LaFe1−xCoxAsO
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 · Physical Review B
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Abstract
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 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaFe0.95Co0.05AsO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.2 | Pressure not reported | onset |
| LaFe0.89Co0.11AsO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14.3 | Pressure not reported | onset |
| LaFe0.85Co0.15AsO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6 | Pressure not reported | onset |
| LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure not reported | unknown |
| SmFeAsO0.9F0.1 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 55 | Pressure not reported | unknown |
| Gd1-xThxFeAsO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 56 | Pressure not reported | unknown |
| SmFeAsO0.85 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 55 | Pressure not reported | unknown |
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