High-magnetic-field X-ray absorption spectroscopy of field-induced valence transition in EuNi2(Si1-xGex)2

Yasuhiro H. Matsuda, Toshiya Inami, Kenji Ohwada, Yuto Murata, Hiroyuki Nojiri, Youichi Murakami, Akihiro Mitsuda, Hirofumi Wada, Hiroshi Miyazaki, Isao Harada

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26 Citations (Scopus)


The magnetic-field-induced valence transition in EuNi2(Si 1-xGex)2 (x = 0.82, 0.85) has been studied by X-ray absorption spectroscopy at low temperatures. The field dependence of the Eu valence is directly observed for the first time. We find a significant decrease in the valences at high magnetic fields above 40 T. The valence of Eu changes from υ* = 2.75 at a zero field to υ* = 2.33 at 40 T for x = 0.82. The results are analyzed using a theoretical model. The hybridization parameter V between the Eu2+ and Eu3+ states and the energy separation ΔE are determined, which are crucial for quantum mechanical mixing.

Original languageEnglish
Article number054713
JournalJournal of the Physical Society of Japan
Issue number5
Publication statusPublished - 2008 May


  • Pulsed magnetic field
  • Valence transition
  • X-ray absorption


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