Superconductivity in
Top Cited Papers
- 10 September 2008
- journal article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 78 (10)
- https://doi.org/10.1103/physrevb.78.104505
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 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.Comment: 19 pages, 9 figureKeywords
This publication has 29 references indexed in Scilit:
- Unconventional Superconductivity with a Sign Reversal in the Order Parameter ofPhysical Review Letters, 2008
- Competing orders and spin-density-wave instability in La(O 1−x F x )FeAsEurophysics Letters, 2008
- Two-band superconductivity in LaFeAsO0.89F0.11 at very high magnetic fieldsNature, 2008
- Electronic correlations in the superconductorwith low carrier densityPhysical Review B, 2008
- Iron-Based Layered Superconductor La[O1-xFx]FeAs (x = 0.05−0.12) with Tc = 26 KJournal of the American Chemical Society, 2008
- Magnetic Neutron Scattering in Hole-Doped Cuprate SuperconductorsJournal of the Physics Society Japan, 2006
- Doping a Mott insulator: Physics of high-temperature superconductivityReviews of Modern Physics, 2006
- Quaternary rare earth transition metal arsenide oxides RTAsO (T=Fe, Ru, Co) with ZrCuSiAs type structureJournal of Alloys and Compounds, 2000
- The rate earth transition metal phosphide oxides LnFePO, LnRuPO and LnCoPO with ZrCuSiAs type structureJournal of Alloys and Compounds, 1995
- ZrCuSiAs: A “filled” PbFCl typeJournal of Solid State Chemistry, 1974