Effects of Core-Hole Screening on Spin-Polarised Auger Spectra from Ferromagnetic Ni |
| T. Wegner, M. Potthoff and W. Nolting Lehrstuhl "Festkörpertheorie", Institut für Physik, Humboldt-Universität zu Berlin, Invalidenstraße 110, 10115 Berlin, Germany |
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| We calculate the spin- and temperature-dependent local density of states for ferromagnetic Ni in the presence of a core hole at a distinguished site in the lattice. Correlations among the valence electrons and between valence and core electrons are described within a multi-band Hubbard model which is treated by means of second-order perturbation theory around the Hartree-Fock solution. The core-hole potential causes strong screening effects in the Ni valence band. The local magnetic moment is found to be decreased by a factor of 5-6. The consequences for the spin polarisation of CVV Auger electrons are discussed. |
| DOI: 10.12693/APhysPolA.97.567 PACS numbers: 79.20.Fv, 71.20.Be, 75.60.Ej |