Europium valencies in substituted EuCu2Si2 systems

I. Nowik; I. Felner; C. Mermelstein; E. R. Bauminger

doi:10.1007/BF02396139

Europium valencies in substituted EuCu₂Si₂ systems

I. Nowik^*, I. Felner, C. Mermelstein, E. R. Bauminger

^*Corresponding author for this work

Racah Institute of Physics

Research output: Contribution to journal › Article › peer-review

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Abstract

Mössbauer studies of¹⁵¹Eu in EuCu_2-xPt_xSi₂, EuCu₂Si_2-xGe_x and Eu_xGd_1-xMn₂Si₂ (x≤0.25) at temperatures between 90 K and 425 K have been performed. All spectra are composed of at least two subspectra, corresponding to stable Eu²⁺ and intermediate valent Eu. The isomer shift of the stable divalent Eu (ordered magnetically up to 400 K in Eu_0.25Gd_0.75Mn₂Si₂) is S₂=-7.5 mm/sec in comparison to S₂=-10.5 mm/s for stable Eu²⁺ in EuMn₂Ge₂. This shows that the Eu²⁺ is under heavy internal pressure in these systems. From the temperature dependence of the hyperfine interaction parameters and line intensities conclusions are derived concerning interconfigurational excitation energies, their inhomogeneous width and recoil free fraction behaviour.

Original language	English
Pages (from-to)	847-851
Number of pages	5
Journal	Hyperfine Interactions
Volume	54
Issue number	1-4
DOIs	https://doi.org/10.1007/BF02396139
State	Published - Jul 1990

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title = "Europium valencies in substituted EuCu2Si2 systems",

abstract = "M{\"o}ssbauer studies of151Eu in EuCu2-xPtxSi2, EuCu2Si2-xGex and EuxGd1-xMn2Si2 (x≤0.25) at temperatures between 90 K and 425 K have been performed. All spectra are composed of at least two subspectra, corresponding to stable Eu2+ and intermediate valent Eu. The isomer shift of the stable divalent Eu (ordered magnetically up to 400 K in Eu0.25Gd0.75Mn2Si2) is S2=-7.5 mm/sec in comparison to S2=-10.5 mm/s for stable Eu2+ in EuMn2Ge2. This shows that the Eu2+ is under heavy internal pressure in these systems. From the temperature dependence of the hyperfine interaction parameters and line intensities conclusions are derived concerning interconfigurational excitation energies, their inhomogeneous width and recoil free fraction behaviour.",

author = "I. Nowik and I. Felner and C. Mermelstein and Bauminger, {E. R.}",

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T1 - Europium valencies in substituted EuCu2Si2 systems

AU - Nowik, I.

AU - Felner, I.

AU - Mermelstein, C.

AU - Bauminger, E. R.

PY - 1990/7

Y1 - 1990/7

N2 - Mössbauer studies of151Eu in EuCu2-xPtxSi2, EuCu2Si2-xGex and EuxGd1-xMn2Si2 (x≤0.25) at temperatures between 90 K and 425 K have been performed. All spectra are composed of at least two subspectra, corresponding to stable Eu2+ and intermediate valent Eu. The isomer shift of the stable divalent Eu (ordered magnetically up to 400 K in Eu0.25Gd0.75Mn2Si2) is S2=-7.5 mm/sec in comparison to S2=-10.5 mm/s for stable Eu2+ in EuMn2Ge2. This shows that the Eu2+ is under heavy internal pressure in these systems. From the temperature dependence of the hyperfine interaction parameters and line intensities conclusions are derived concerning interconfigurational excitation energies, their inhomogeneous width and recoil free fraction behaviour.

AB - Mössbauer studies of151Eu in EuCu2-xPtxSi2, EuCu2Si2-xGex and EuxGd1-xMn2Si2 (x≤0.25) at temperatures between 90 K and 425 K have been performed. All spectra are composed of at least two subspectra, corresponding to stable Eu2+ and intermediate valent Eu. The isomer shift of the stable divalent Eu (ordered magnetically up to 400 K in Eu0.25Gd0.75Mn2Si2) is S2=-7.5 mm/sec in comparison to S2=-10.5 mm/s for stable Eu2+ in EuMn2Ge2. This shows that the Eu2+ is under heavy internal pressure in these systems. From the temperature dependence of the hyperfine interaction parameters and line intensities conclusions are derived concerning interconfigurational excitation energies, their inhomogeneous width and recoil free fraction behaviour.

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Europium valencies in substituted EuCu₂Si₂ systems

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