High-Magnetic-Field X-ray Absorption Spectroscopy of Field-Induced Valence Transition in EuNi<SUB>2</SUB>(Si<SUB>1−<I>x</I></SUB>Ge<I><SUB>x</SUB></I>)<SUB>2</SUB>

Access this Article

Author(s)

Abstract

The magnetic-field-induced valence transition in EuNi<SUB>2</SUB>(Si<SUB>1−<I>x</I></SUB>Ge<I><SUB>x</SUB></I>)<SUB>2</SUB> (<I>x</I>=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 <I>v</I><SUP>*</SUP>=2.75 at a zero field to <I>v</I><SUP>*</SUP>=2.33 at 40 T for <I>x</I>=0.82. The results are analyzed using a theoretical model. The hybridization parameter <I>V</I> between the Eu<SUP>2+</SUP> and Eu<SUP>3+</SUP> states and the energy separation Δ<I>E</I> are determined, which are crucial for quantum mechanical mixing.

Journal

  • Journal of the Physical Society of Japan

    Journal of the Physical Society of Japan 77(5), 054713-054713, 2008

    THE PHYSICAL SOCIETY OF JAPAN

Codes

  • NII Article ID (NAID)
    130005436453
  • Text Lang
    ENG
  • ISSN
    0031-9015
  • Data Source
    J-STAGE 
Page Top