title: Resonant "forbidden" reflections in magnetite.
abstract: Resonant x-ray scattering was used to investigate electronic fluctuations of the octahedral iron atoms in magnetite. We measured the (002) and (006) "forbidden" x-ray diffraction reflections permitted by the anisotropy of the iron anomalous scattering factor. The energy and azimuthal angle dependencies of these reflections, and the polarization analysis, are shown and discussed. The results clearly show p and d iron empty states ordering in magnetite at room temperature. Moreover, the octahedral iron atoms are electronically equivalent in a time scale lower than 10(-16) sec. Therefore, magnetite should be considered as an itinerant magnet and not as a fluctuating mixed valence material.
authors.affiliation: Instituto de Ciencia de Materiales de Aragón, Consejo Superior de Investigaciones Científicas y Universidad de Zaragoza, 50009 Zaragoza, Spain. jgr@posta.unizar.es
authors.forename: J
authors.initials: J
authors.lastname: García
authors.forename: G
authors.initials: G
authors.lastname: Subías
authors.forename: M G
authors.initials: MG
authors.lastname: Proietti
authors.forename: H
authors.initials: H
authors.lastname: Renevier
authors.forename: Y
authors.initials: Y
authors.lastname: Joly
authors.forename: J L
authors.initials: JL
authors.lastname: Hodeau
authors.forename: J
authors.initials: J
authors.lastname: Blasco
authors.forename: M C
authors.initials: MC
authors.lastname: Sánchez
authors.forename: J F
authors.initials: JF
authors.lastname: Bérar