The Influence of Hydrostatic Pressure on Intermediate Europium Valence State in Compound EuCu2Ge2

We report the high-pressure XANES study of europium intermediate valence in the rare-earth compound EuСu2Ge2. The hydrostatic pressure-dependence of europium valence was obtained in a wide pressure range (1-30GPa) at room temperature. The saturation region of the europium valence was found at the pr...

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Bibliographic Details
Published inPhysics procedia Vol. 71; pp. 308 - 312
Main Authors Menushenkov, A.P., Yaroslatsev, A.A., Geondzhian, A.Y., Alekseev, P.A., Chernikov, R.V., Gaynanov, B., Baudelet, F., Nataf, L.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 2015
Subjects
EuCu2Ge2
high pressure
intermediate valence state
XANES
intermediate valence state
EuCu2Ge2
XANES
high pressure
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Summary:We report the high-pressure XANES study of europium intermediate valence in the rare-earth compound EuСu2Ge2. The hydrostatic pressure-dependence of europium valence was obtained in a wide pressure range (1-30GPa) at room temperature. The saturation region of the europium valence was found at the pressure higher than 20GPa, when the valence reaches the value of 2.89. The study compared the mechanisms of external and “chemical” pressure by the Si substitution in Ge site in series EuCu2(SixGe1-x)2. The experimental results were supported by band structure calculations in the framework of DFT, which allowed us to discuss the features of 3d-4f hybridization model for this system.
ISSN:1875-3892
1875-3892
DOI:10.1016/j.phpro.2015.08.332