Temperature-dependent Eu 3d-4f x-ray absorption and resonant photoemission study of the valence transition in EuNi2(Si0.2Ge0.8)2

K. Yamamoto, K. Horiba, M. Taguchi, M. Matsunami, N. Kamakura, A. Chainani, Y. Takata, K. Mimura, M. Shiga, H. Wada, Y. Senba, H. Ohashi, S. Shin

研究成果: Contribution to journalArticle査読

16 被引用数 (Scopus)

抄録

We study the mixed valence transition (Tv∼80K) in EuNi2(Si0.2Ge0.8)2 using Eu 3d-4f x-ray absorption spectroscopy (XAS) and resonant photoemission spectroscopy (RESPES). The Eu2+ and Eu3+ main peaks show a giant resonance and the spectral features match very well with atomic multiplet calculations. The spectra show dramatic temperature (T) dependent changes over large energies (∼10eV) in RESPES and XAS. The observed nonintegral mean valencies of ∼2.35±0.03(T=120K) and ∼2.70±0.03(T=40K) indicate homogeneous mixed valence above and below Tv. The redistribution between Eu2+4f7+[spd]0 and Eu3+4f6+[spd]1 states is attributed to a hybridization change coupled to a Kondo-like volume collapse.

本文言語英語
論文番号161101
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
72
16
DOI
出版ステータス出版済み - 10 15 2005

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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