Journal of Physics Condensed Matter · 2010 · 26 citations · 18 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsSolid State PhysicsTransport PhenomenaElectrical ConductivityMagnetic OxidesStrongly Correlated Electron SystemsSuperconducting MaterialsThermoelectric MaterialsCo-dopingElectrical PropertiesElectrical ResistivityElectrical Transport PropertiesHigh-temperature SuperconductorsIron-based SuperconductorsSuperconducting Critical TemperatureSuperconducting Properties
A series of CeFe(1-x)Co(x)AsO oxyarsenide compounds with Co doping on iron sites (x = 0-0.2) have been synthesized by a solid state reaction method. The effects of Co doping on the electrical transport properties and superconductivity were analyzed with a special emphasis on the analysis of thermopower. Undoped CeFeAsO shows an electrical resistivity anomaly at about 150 K, which was ascribed to a spin-density-wave (SDW) instability. This anomaly is suppressed and a superconducting transition occurs at T(c) = 3.2 K in CeFe(0.95)Co(0.05)AsO, the maximum superconducting transition temperature (T(c)) of 12.5 K is observed in CeFe(0.90)Co(0.10)AsO, and the thermopower is increased by the Co doping. As has been previously suggested, the emergence of superconductivity seems to be closely linked to the thermopower, and there is a close correlation between T(c) and the thermopower, both showing a similar dome-like doping dependence.
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Yoichi Kamihara, Takumi Watanabe, Masahiro Hirano et al. · Journal of the American Chemical Society · 2008 · 7.9K citations
Magnetic order close to superconductivity in the iron-based layered LaO1-xF x FeAs systems
Clarina dela Cruz, Q. Huang, J. W. Lynn et al. · Nature · 2008 · 1.8K citations · Full text
Superconductivity at 43 K in an iron-based layered compound LaO1-xFxFeAs
Hiroki Takahashi, Kazumi Igawa, Kazunobu Arii et al. · Nature · 2008 · 1.3K citations