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

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19 引文 斯高帕斯(Scopus)

摘要

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.

原文English
文章編號161101
期刊Physical Review B - Condensed Matter and Materials Physics
72
發行號16
DOIs
出版狀態Published - 2005 10月 15

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 凝聚態物理學

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