Non-quasiparticle states in the core level spectra of ferromagnetic semiconductors and half-metallic ferromagnets
Institute of Metal Physics, Ekaterinburg 620219, Russia
2 Department of Physics, Uppsala University, Uppsala 751 21, Sweden
3 Institute for Molecules and Materials, Radboud University, Nijmegen 6525 ED, The Netherlands
Published online: 30 March 2005
The Green's functions that determine X-ray spectra are calculated in the exchange model of a saturated conducting ferromagnet in the presence of the core hole. It is demonstrated that the core level (X-ray absorption, emission and photoelectron) spectroscopy might be an efficient tool to investigate the nonquasiparticle (NQP, spin-polaron) states in electron energy spectrum since the core hole potential can enhance essentially their spectral weight. NQP contributions to resonant X-ray scattering spectra can be also much more pronounced than those to the the density of states.
PACS: 78.70.Dm – X-ray absorption spectra / 78.70.En – X-ray emission spectra and fluorescence / 75.50.Pp – Magnetic semiconductors / 75.50.Cc – Other ferromagnetic metals and alloys
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2005