Resonant inelastic X-ray scattering at the oxygen K resonance of NiO: Nonlocal charge transfer and double-singlet excitations

L. C. Duda, T. Schmitt, M. Magnuson, J. Forsberg, A. Olsson, J. Nordgren, K. Okada, A. Kotani

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

We report high-resolution polarization-dependent resonant inelastic x-ray scattering (RIXS) at the O K resonance of NiO showing a rich excitation spectrum. We perform multisite Ni6O19 cluster model calculations, revealing that solid state effects are substantial. We identify a nonlocal charge transfer excitation at 4-5 eV and double-singlet creation at 1.75 eV, both exhibiting significant scattering geometry dependence. Apart from an intense band of local charge transfer excitations (above 5 eV) also dd excitations at 1 eV are observed. Finally, we point out that O K RIXS of correlated metal oxides allows a quantitative and consistent determination of the charge transfer energy Δ and the Hund coupling energy JH.

Original languageEnglish
Article number067402
JournalPhysical Review Letters
Volume96
Issue number6
DOIs
Publication statusPublished - Jan 1 2006

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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