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- Title
Gap state imaging and spin-orbit effects in resonant photoelectron diffraction.
- Authors
Krüger, Peter; Pieve, Fabiana Da
- Abstract
In core-level photoelectron diffraction, the surface atomic structure is imaged through a local source wave. In valence photoemission, the source wave gets effectively localized at a core-valence resonance, and local information on valence states can be obtained. Through photoelectron diffraction at the Ti 2 p − 3 d resonance, we have determined the charge distribution of the gap state at n-doped TiO2 surfaces. Second, the origin of spin polarization in resonant photoemission from non-ferromagnetic surfaces is critically reviewed. We have developed a multiple scattering computational method for resonant photoemission and have applied it to Cr(110) and Fe(100). For circular polarized light, we find that the resonant photocurrent is strongly spin polarized in antiferromagnets and disordered ferromagnets, in agreement with experiment. Contrary to previous interpretations, we show that this spin polarization is essentially unrelated to local magnetic moments, but because of an angular momentum transfer from the photon to the photoelectron via core spin-orbit coupling and exchange autoionization decay. Copyright © 2016 John Wiley & Sons, Ltd.
- Subjects
ELECTRON diffraction; SPIN-orbit interactions; PHOTOELECTRONS; PHOTOEMISSION; TITANIUM oxides; TRANSITION metals
- Publication
Surface & Interface Analysis: SIA, 2016, Vol 48, Issue 11, p1169
- ISSN
0142-2421
- Publication type
Article
- DOI
10.1002/sia.6182