Disorder and mixed valence properties of Sr2FeMoO6 studied by photoelectron diffraction and x-ray absorption spectroscopy

•Photoelectron diffraction experiments support a disorder picture for Sr2FeMoO6.•The bulk electronic state of Sr2FeMoO6 will be disorder state.•X-ray absorption spectra suggested the existence of Fe2+ at the surface.•Mixed-valence state may exist at surface of Sr2FeMoO6. [Display omitted] A single c...

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Bibliographic Details
Published in:Surface science 2019-05, Vol.683, p.53-56
Main Authors: Taguchi, Munetaka, Matsui, Fumihiko, Maejima, Naoyuki, Matsui, Hirosuke, Daimon, Hiroshi
Format: Article
Language:English
Subjects:
Absorption spectroscopy
Disorder
Double perovskite
Magnetic saturation
Mixed valence
Photoelectron diffraction
Photoelectrons
Single crystals
Spectrum analysis
X ray absorption
X-ray absorption spectroscopy
X-ray diffraction
X-ray spectroscopy
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Summary:•Photoelectron diffraction experiments support a disorder picture for Sr2FeMoO6.•The bulk electronic state of Sr2FeMoO6 will be disorder state.•X-ray absorption spectra suggested the existence of Fe2+ at the surface.•Mixed-valence state may exist at surface of Sr2FeMoO6. [Display omitted] A single crystal of the double peroviskite Sr2FeMoO6 has been prepared and was studied by using two-dimensional photoelectron diffraction (2DPED) and x-ray absorption spectroscopy (XAS). We found clear evidence for disorder of Fe3+/Mo5+ by 2DPED experiments, supporting a disorder picture for Sr2FeMoO6. On the other hand, Fe 2p XAS spectra suggested the existence of Fe2+ components (i.e. the mixed valence states) at the surface, but it was suppressed in the bulk. It seems that this fact has complicated a controversy so far concerning the reduction of saturation magnetization of this material.
ISSN:0039-6028
1879-2758
DOI:10.1016/j.susc.2019.02.001