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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Abstract

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.

Original languageEnglish
Article number161101
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume72
Issue number16
DOIs
Publication statusPublished - Oct 15 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Yamamoto, K., Horiba, K., Taguchi, M., Matsunami, M., Kamakura, N., Chainani, A., Takata, Y., Mimura, K., Shiga, M., Wada, H., Senba, Y., Ohashi, H., & Shin, S. (2005). Temperature-dependent Eu 3d-4f x-ray absorption and resonant photoemission study of the valence transition in EuNi2(Si0.2Ge0.8)2. Physical Review B - Condensed Matter and Materials Physics, 72(16), [161101]. https://doi.org/10.1103/PhysRevB.72.161101