Pressure-Induced Valence Change of Eu in Eu( ${Pd}_{0.8}$ ${Au}_{0.2}$ ) ${}_{2}{Si}_{2}$ : Collapse of Magnetic Order

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25 November 1985

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 55 (22) , 2467-2470
https://doi.org/10.1103/physrevlett.55.2467

Abstract

We report the first observation of a pressure-induced breakdown of a magnetically ordering

{Eu}^{2 +}

(

J = \frac{7}{2}

) state to a nonmagnetic intermediate-valent state in antiferromagnetically ordered Eu(

{Pd}_{0.8}

{Au}_{0.2}

)

{}_{2}{Si}_{2}

. The experimental results allow us to determine the limits of the range of the Eu mean valence of

2.0 <~ \bar{v} <~ 2.2

at 4.2 K, over which magnetic order and intermediate valence can coexist.

Keywords

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