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129st SPring-8 Seminar

Subtitle/Subject Analysis of Resonant X-Ry Scattering Spectra
Period to Nov 05 , 2004
Venue Kamitsubo Hall
Host/Organizer JASRI/SPring-8
Format Lecture

Date & Time: 5 November 2004, 14:00-15:00

Speaker: Prof. Junichi Igarashi
Affiliation: Ibaraki University

  We report a recent activity of our group on the theoretical analysis of resonant x-ray scattering (RXS) spectra.
  First, we present the analysis of Cr K-edge resonant magnetic scattering spectra in the spin density wave (SDW) state. We perform the band structure calculation assuming a commensurate SDW state with the propagation vector close to the observed value. We obtain the RXS spectra in good agreement with the experiment. In spite of the tiny orbital moment, the orbital polarization is found to have large fluctuations as a function of energy. This causes a large orbital polarizartion in the 4p band through the p-d hybridization, thereby a large RXS intensity is brought about.
  Second, we present the analysis of U M-edge RXS spectra in URu2Si2.
  Our analysis is based on a localized crystal electric field model for U4+ in the 5f2-configuration with full Coulomb and spin-orbit interactions taken into account. We calculate the RXS spectran assuming the dipole, quadrupole and octupole orders, in comparison with the experiment.

Contact Address Junichiro Mizuki (PHS 3902) JASRI/SPring-8

Last modified 2006-04-08 17:01