X-ray magnetic circular dichroism at rare-earth L-absorption edges in Laves-phase compounds, RFe 2 (R = rare-earth)

I. Harada, K. Asakura, A. Fujiwara, A. Kotani

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Recent progress of the theoretical interpretation for the X-ray magnetic circular dichroism (XMCD) at the rare-earth (RE) L2,3 absorption edges is reviewed. We discuss the XMCD spectra of RFe2 (R = RE) in the Laves phase based on the tight-binding approximation for RE 5d and Fe 3d conducting states. A variety of the XMCD spectra can be attributed to (i) the electric dipole and (ii) the electric quadrupole transitions. For (i), the polarization of the RE 5d electrons, being indispensable for XMCD, is dominated by the RE intra-atomic exchange interaction, which also yields the enhancement of the 2p-5d dipole matrix element. In addition, the hybridization with the spin-polarized Fe 3d states plays a distinctive role. For (ii), the multiplet couplings among the 4f electrons and the 2p core hole determine the XMCD spectra. We also consider XMCD in the mixed valence compound CeFe2, taking many-body interactions into account based on the impurity Anderson model combined with a cluster approximation.

Original languageEnglish
Pages (from-to)125-133
Number of pages9
JournalJournal of Electron Spectroscopy and Related Phenomena
Volume136
Issue number1-2
DOIs
Publication statusPublished - May 2004

Keywords

  • Mixed valence compound
  • Rare-earth L absorption edges
  • Rare-earth intermetallic compound
  • X-ray magnetic circular dichroism

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry

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