Nonresonant inelastic x-ray scattering involving excitonic excitations

• Verfasst von: Haverkort, Maurits W. [VerfasserIn]
• Titel: Nonresonant inelastic x-ray scattering involving excitonic excitations
• Titelzusatz: the examples of NiO and CoO
• Verf.angabe: M.W. Haverkort, A. Tanaka, L.H. Tjeng, and G.A. Sawatzky
• Fussnoten: Gesehen am 08.11.2017
• Titel Quelle: Enthalten in: Physical review letters
• Jahr Quelle: 2007
• Band/Heft Quelle: 99(2007,25) Artikel-Nummer 257401, 4 Seiten
• ISSN Quelle: 1079-7114
• DOI: doi:10.1103/PhysRevLett.99.257401
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1565125843

Abstract

In a recent publication Larson et al. reported remarkably clear d−d excitations for NiO and CoO with x-ray scattering. Here we present an accurate quantitative description based on a local many body approach, beyond local density approximation + Hubbard U approximations. The magnitude of →q determines which of the allowed multipoles contributes most to the spectra. The direction of →q with respect to the crystal can be used as an equivalent to polarization similar to electron energy loss spectroscopy, allowing for a determination of the local symmetry of the initial and final states. This method is more generally applicable and could be a powerful tool for the study of local distortions and symmetries in transition metal and rare earth compounds.