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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Abstract

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
Volume77
Issue number5
DOIs
Publication statusPublished - May 1 2008

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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