Superconductivity at 41 K and its competition with spin-density-wave instability in layered CeO1-xFxFeAs.
By G. Chen, Ziting Li, D. Wu, Gang Li, W. Hu, J. Dong, P. Zheng, J. Luo, Ning Wang. Physical Review Letters, 2008
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A series of layered CeO1-xFxFeAs compounds with x=0 to 0.20 are synthesized by the solid state reaction method. Similar to the LaOFeAs, the pure CeOFeAs shows a strong resistivity anomaly near 145 K, which was ascribed to the spin-density-wave instability. F doping suppresses this instability and leads to the superconducting ground state. Most surprisingly, the superconducting transition temperature could reach as high as 41 K. Such a high T_{c} strongly challenges the classic BCS theory based on the electron-phonon interaction. The closeness of the superconducting phase to the spin-density-wave instability suggests that the magnetic fluctuation plays a key role in the superconducting pairing mechanism. The study also reveals that the Ce 4f electrons form local moments and are ordered antiferromagnetically below 4 K, which could coexist with superconductivity.
Subfields: Condensed Matter Physics, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/ba0ce35b86f36067cd32a8c90071c426573a6fc7
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Citations in the corpus
- Superconducting wind turbine generators (2010, neutral): “The most recent developments in material science have led to the discoveries of superconductivity in MgB2 (13) and FeAs (14) which caused a debate about their unique physical properties.”