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Crystal-field states of UO2 probed by directional dependence of nonresonant inelastic x-ray scattering

DOI: 10.1103/PhysRevB.98.205108 DOI Help

Authors: M. Sundermann (University of Cologne; Max Planck Institute for Chemical Physics of Solids) , G. Van Der Laan (Diamond Light Source) , Andrea Severing (University of Cologne; Max Planck Institute for Chemical Physics of Solids) , L. Simonelli (European Synchrotron Radiation Facility (ESRF)) , G. H. Lander (European Commission, Joint Research Centre (JRC)) , M. W. Haverkort (Heidelberg University) , R. Caciuffo (European Commission, Joint Research Centre (JRC))
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 98 , PAGES 205108

State: Published (Approved)
Published: November 2018

Abstract: Nonresonant inelastic x-ray scattering (NIXS) has been performed on single crystals of UO2 to study the directional dependence of higher-order-multipole scattering from the uranium O4,5 edges (90-110 eV). By comparing the experimental results with theoretical calculations the symmetry of the ground state is confirmed directly as the crystal-field (CF) Γ5 triplet state within the J = 4 manifold. The results demonstrate that the directional dichroism of the NIXS spectra is sensitive to the CF strength and establish NIXS as a tool for probing CF interactions quantitatively.

Journal Keywords: actinides; x-ray scattering; multipoles

Subject Areas: Physics, Materials, Environment

Facility: ESRF