Resonant X-Ray Scattering on the M-Edge Spectra from Triple-k Structure Phase in U_{0.75}Np_{0.25}O_{2} and UO_{2}

Abstract

We derive an expression for the scattering amplitude of resonant x-ray scattering under the assumption that the Hamiltonian describing the intermediate state preserves spherical symmetry. On the basis of this expression, we demonstrate that the energy profile of the RXS spectra expected near U and Np M_4 edges from the triple-k antiferromagnetic ordering phase in UO_{2} and U_{0.75}Np_{0.25}O_{2} agree well with those from the experiments. We demonstrate that the spectra in the σ-σ' and σ-π' channels exhibit quadrupole and dipole natures, respectively.

3 pages, 3 figures, to be published in J. Phys. Soc. Jpn. Suppl

References in corpus (7)

• Triple-q octupolar ordering in NpO_2
• Direct observation of electric-quadrupolar order in UO${}_2$
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• Octupolar ordering of Gamma8 ions in magnetic field
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Cited by in corpus (1)

• A theory of the electric quadrupole contribution to resonant x-ray scattering: Application to multipole ordering phases in Ce_{1-x}La_{x}B_{6}