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Author Brouder, C. ♦ Alouani, M. ♦ Bennemann, K. H.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ MAGNETIC CIRCULAR DICHROISM ♦ MULTIPLE SCATTERING ♦ X-RAY SPECTRA ♦ ABSORPTION SPECTROSCOPY ♦ CLUSTER MODEL ♦ GREEN FUNCTION ♦ IRON ♦ BCC LATTICES ♦ RELATIVISTIC CORRECTIONS
Abstract An implementation of the multiple-scattering approach to x-ray magnetic circular dichroism (XMCD) in {ital K} edge x-ray absorption spectroscopy is presented. The convergence problems due to the cluster size and the relativistic corrections are solved using an expansion of the Dirac Green function for complex energies up to second order in 1/{ital c}. The Fermi energy is dealt with via a complex plane integration. Numerical methods used to obtain the semirelativistic Green function in the whole complex plane are explained. We present a calculation of the magnetic circular dichroism at the {ital K} edge of bcc iron including the core hole effect. A good agreement is found at high energy. The physical origins of the XMCD spectrum near the edge and far from the edge are analyzed. The influence of the core hole, the possibility of a multiple-scattering expansion, and the relation of XMCD with the spin polarized density of states are discussed. A simple interpretation of XMCD at the {ital K} edge is presented in terms of a rigid-band model. {copyright} {ital 1996 The American Physical Society.}
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-09-01
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 54
Issue Number 10


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