High-magnetic-field XMCD as a novel tool for the study of valence fluctuation phenomena-application to eu-based intermetallic compounds

Y. H. Matsuda, J. L. Her, T. Inami, K. Ohwada, Z. W. Ouyang, K. Okada, H. Nojiri, Akihiro Mitsuda, Hirofumi Wada, N. Kawamura, M. Suzuki

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Abstract

X-ray magnetic circular dichroism (XMCD) in Eu-based valence fluctuating compounds, EuNi2(Si1-x Ge x )2 (x=0.82, 0.85) and EuNi2P2 are investigated at high magnetic fields up to 40 T. Distinct two XMCD peaks corresponding to different valence states, i.e., Eu2+ and Eu3+ states are observed in EuNi2(Si1-x Ge x )2 (x=0.82) and EuNi2P2 at the L absorption edges (2p→5d). This suggests that the Eu 5d electrons are magnetically polarized in the both valence states. Since Eu3+ state has nonmagnetic ground state J=0, where J is total angular momentum, finite XMCD of Eu3+ state can be closely related to the magnetic polarization of the conduction electrons that is induced by the local magnetic moments of Eu2+ (J=7/2) state through the strong hybridization.

Original languageEnglish
Pages (from-to)292-296
Number of pages5
JournalJournal of Low Temperature Physics
Volume159
Issue number1-2
DOIs
Publication statusPublished - Apr 1 2010

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All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics

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