Temperature- and field-induced valence transitions of EuNi2(Si1-xGex)2

Hirofumi Wada, A. Nakamura, Akihiro Mitsuda, M. Shiga, T. Tanaka, H. Mitamura, T. Goto

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Abstract

The magnetic properties of the EuNi2(Si1-xGex)2 system were studied in which an intermediate-valence state of Eu is realized at around x = 0.75. It was found that the compounds with 0.70 ≤ x ≤ 0.82 show a temperature-induced valence transition below room temperature, while those with x ≥ 0.85 are antiferromagnetic with a stable Eu2+ state. A first-order valence transition induces by high magnetic field was observed for 0.75 ≤ x ≤ 0.82. Such valence transition against temperature or field are discussed on the basis of the interconfigurational fluctuation (ICF) model. It is shown that the observed linear relation between the transition field and the transition temperature is explained by the present model.

Original languageEnglish
Pages (from-to)7913-7923
Number of pages11
JournalJournal of Physics Condensed Matter
Volume9
Issue number37
DOIs
Publication statusPublished - Sep 15 1997
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

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