Issue |
Europhys. Lett.
Volume 66, Number 3, May 2004
|
|
---|---|---|
Page(s) | 441 - 447 | |
Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
DOI | https://doi.org/10.1209/epl/i2003-10212-2 | |
Published online | 01 April 2004 |
Spin-dependent sum rules for X-ray absorption spectra
1
Department of Physics, University of Washington Seattle, WA 98195-1560, USA
2
Institut für Experimentalphysik, Freie Universität Berlin D-14195 Berlin-Dahlem, Germany
Received:
17
October
2003
Accepted:
19
February
2004
The X-ray absorption sum rules for the spin and orbital moments
are generalized, through the introduction of a spin-asymmetry
parameter, to account for the spin dependence of the dipole
matrix elements. This generalization is important for the
analysis of -edge X-ray magnetic circular dichroism of
rare-earth elements, for which the original sum rules erroneously
predict an antiparallel alignment of the
and
moments.
The corrections to the sum rules are of the same order as the
extracted moments for these systems. A procedure to apply the
generalized sum rules is given, which makes use of theoretical
calculations in addition to experimental data; the procedure is
illustrated for
metal.
PACS: 78.70.Dm – X-ray absorption spectra / 78.20.Ls – Magnetooptical effects / 75.50.Cc – Other ferromagnetic metals and alloys
© EDP Sciences, 2004
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