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Critical reexamination of resonant soft x-ray Bragg forbidden reflections in magnetite

DOI: 10.1103/PhysRevB.79.201102 DOI Help

Authors: Stuart Wilkins (Brookhaven Natl Lab, Diamond Light Source) , S. Di Matteo (Institut de Physique de Rennes) , Thomas Beale (University of Durham) , Y. Joly (Institut Louis NĂ©el, CNRS) , Claudio Mazzoli (ESRF) , Peter Hatton (University of Durham) , Peter Bencok (Diamond Light Source) , Flora Yakhou-harris (ESRF) , V. A. M. Brabers (Eindhoven University of Technology)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B

State: Published (Approved)
Published: May 2009

Abstract: Magnetite, Fe(3)O(4), displays a highly complex low-temperature crystal structure that may be charge and orbitally ordered. Many of the recent experimental claims of such ordering rely on resonant soft x-ray diffraction at the oxygen K and iron L edges. We have reexamined this system and undertaken soft x-ray diffraction experiments on a high-quality single crystal. Contrary to previous claims in the literature, we show that the intensity observed at the Bragg forbidden (001/2)(c) reflection can be explained purely in terms of the low-temperature structural displacements around the resonant atoms. This does not necessarily mean that magnetite is not charge or orbitally ordered but rather that the present sensitivity of resonant soft x-ray experiments does not allow conclusive demonstration of such ordering.

Subject Areas: Physics

Facility: ESRF