Nonresonant Inelastic X-Ray Scattering Involving Excitonic Excitations: The Examples of NiO and CoO

M. W. Haverkort, A. Tanaka, L. H. Tjeng, and G. A. Sawatzky
Phys. Rev. Lett. 99, 257401 – Published 21 December 2007

Abstract

In a recent publication Larson et al. reported remarkably clear dd 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.

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  • Received 18 May 2007

DOI:https://doi.org/10.1103/PhysRevLett.99.257401

©2007 American Physical Society

Authors & Affiliations

M. W. Haverkort1, A. Tanaka2, L. H. Tjeng1, and G. A. Sawatzky3

  • 1II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
  • 2Department of Quantum Matter, ADSM, Hiroshima University, Higashi-Hiroshima 739-8530, Japan
  • 3Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1

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Vol. 99, Iss. 25 — 21 December 2007

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