Title: Resonant Magnetic X-Ray Scattering in UPd2Si2 at the Uranium L2,3 Edges.
Citation: Physical Review B vol. 58 no. 14 p. 9185-9192
Publication Year: 1998
JRC N°: JRC16479
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC16479
Type: Articles in periodicals and books
Abstract: The nature of the resonant magnetic x-ray scattering processes at the uranium L2 and L3 edges of UPd2Si2 has been studied. The different polarization dependences of the electric dipole and quadrupole transitions are used to distinguish the two channels. The temperature variation, together with the angular dependence of the magnetic reflections demonstrate the dipolar origin of the resonance at the uranium L2 and L3 edges of UPd2Si2. Resonant magnetic x-ray scattering at these edges thus explores the spin-polarization of the valence 6d band allows the study of the magnetism of electronic d orbitals separately from f levels probed at the M4 and M5 edges in dipole transitions. The energy profiles of the two L edges are different. A single resonance is observed at the L2 edge, where the scattering amplitude is dominated by the exchange splitting contribution between the spin-up and spin-down 6d states. The lineshape at the L3 edge shows two distinct contributions; both of dipolar type, which may be due to the influence of the core hole on the density of state of 6d levels. The energy of the maximum of the resonant intensity in both profiles corresponds to the inflexion point in the respective absorption coefficient curve. This is in contrast with what has been observed at the uranium M4 and M5 edges in UPd2Si2 and in other uranium systems where the peak in the resonance coincides with the maximum of the absorption coefficient.
JRC Directorate:Nuclear Safety and Security

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