title: Evidence for strong itinerant spin fluctuations in the normal state of CeFeAsO0.89F0.11 iron-oxypnictide superconductors.
abstract: The electronic structure in the normal state of CeFeAsO0.89F0.11 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 the underlying physics and the origin of superconductivity in these materials are likely to be quite different from those of the cuprate high-temperature superconductors. These materials provide opportunities for elucidating the role of magnetic fluctuations in high-temperature superconductivity.
authors.affiliation: CNR-INFM, Laboratorio Nazionale TASC, S.S. 14, km 163.5, 1-34012 Trieste, Italy.
authors.forename: F
authors.initials: F
authors.lastname: Bondino
authors.forename: E
authors.initials: E
authors.lastname: Magnano
authors.forename: M
authors.initials: M
authors.lastname: Malvestuto
authors.forename: F
authors.initials: F
authors.lastname: Parmigiani
authors.forename: M A
authors.initials: MA
authors.lastname: McGuire
authors.forename: A S
authors.initials: AS
authors.lastname: Sefat
authors.forename: B C
authors.initials: BC
authors.lastname: Sales
authors.forename: R
authors.initials: R
authors.lastname: Jin
authors.forename: D
authors.initials: D
authors.lastname: Mandrus
authors.forename: E W
authors.initials: EW
authors.lastname: Plummer
authors.forename: D J
authors.initials: DJ
authors.lastname: Singh
authors.forename: N
authors.initials: N
authors.lastname: Mannella