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Evidence for Strong Itinerant Spin Fluctuations in the Normal State of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>CeFeAsO</mml:mi><mml:mn>0.89</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">F</mml:mi><mml:mn>0.11</mml:mn></mml:msub></mml:math>Iron-Oxypnictide Superconductors
The electronic structure in the normal state of ${\mathrm{CeFeAsO}}_{0.89}{\mathrm{F}}_{0.11}$ oxypnictide superconductors has been investigated with x-ray absorption and photoemission spectroscopy. All of the data exhibit signatures of Fe $d$-electron itinerancy. Exchange multiplets appearing in the Fe $3s$ core level indicate the presence of itinerant spin fluctuations. These findings suggest that …