Intermediate-valence state of the Sm and Eu in SmB6 and EuCu2Si2: Neutron spectroscopy data and analysis

P. S. Savchenkov; P. A. Alekseev; A. Podlesnyak; A. I. Kolesnikov; K. S. Nemkovski

doi:10.1088/1361-648X/aaa1aa

Intermediate-valence state of the Sm and Eu in SmB₆ and EuCu₂Si₂: Neutron spectroscopy data and analysis

P. S. Savchenkov, P. A. Alekseev, A. Podlesnyak, A. I. Kolesnikov, K. S. Nemkovski

Direct Geometry

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

6 Scopus citations

Abstract

Magnetic neutron scattering data for Sm (SmB₆, Sm(Y)S) and Eu (EuCu₂Si_2-xGe_x) intermediate-valence compounds have been analysed in terms of a generalized model of the intermediate-radius exciton. Special attention is paid to the correlation between the average ion's valence and parameters of the low-energy excitation in the neutron spectra, such as the resonance mode, including its magnetic form factor. Along with specific features of the formation of the intermediate-valence state for Sm and Eu ions, common physical mechanisms have been revealed for systems based on these elements from the middle of the rare-earth series. A consistent description of the existing experimental data has been obtained by using the concept of a loosely bound hole for the Eu f-electron shell in the intermediate-valence state, in analogy with the previously established loosely bound electron model for the Sm ion.

Original language	English
Article number	055801
Journal	Journal of Physics Condensed Matter
Volume	30
Issue number	5
DOIs	https://doi.org/10.1088/1361-648X/aaa1aa
State	Published - Jan 11 2018

Funding

The authors are grateful to V N Lazukov, J-M Mignot, D N Trunov, E S Clementyev, L A Maksimov and A F Barabanov for useful discussions and support of the work. This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. This work was partly performed within the framework of National Research Nuclear University MEPhI (Moscow Engineering Physics Institute) Academic Excellence Project (contract № 02.a03.21.0005).

Funders	Funder number
National Research Nuclear University MEPhI	№ 02.

Keywords

intermediate valence
intermultiplet transitions
magnetic form factor
neutron spectroscopy
rare-earth compounds

Access to Document

10.1088/1361-648X/aaa1aa

Cite this

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title = "Intermediate-valence state of the Sm and Eu in SmB6 and EuCu2Si2: Neutron spectroscopy data and analysis",

abstract = "Magnetic neutron scattering data for Sm (SmB6, Sm(Y)S) and Eu (EuCu2Si2-xGex) intermediate-valence compounds have been analysed in terms of a generalized model of the intermediate-radius exciton. Special attention is paid to the correlation between the average ion's valence and parameters of the low-energy excitation in the neutron spectra, such as the resonance mode, including its magnetic form factor. Along with specific features of the formation of the intermediate-valence state for Sm and Eu ions, common physical mechanisms have been revealed for systems based on these elements from the middle of the rare-earth series. A consistent description of the existing experimental data has been obtained by using the concept of a loosely bound hole for the Eu f-electron shell in the intermediate-valence state, in analogy with the previously established loosely bound electron model for the Sm ion.",

keywords = "intermediate valence, intermultiplet transitions, magnetic form factor, neutron spectroscopy, rare-earth compounds",

author = "Savchenkov, {P. S.} and Alekseev, {P. A.} and A. Podlesnyak and Kolesnikov, {A. I.} and Nemkovski, {K. S.}",

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T2 - Neutron spectroscopy data and analysis

AU - Savchenkov, P. S.

AU - Alekseev, P. A.

AU - Podlesnyak, A.

AU - Kolesnikov, A. I.

AU - Nemkovski, K. S.

PY - 2018/1/11

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AB - Magnetic neutron scattering data for Sm (SmB6, Sm(Y)S) and Eu (EuCu2Si2-xGex) intermediate-valence compounds have been analysed in terms of a generalized model of the intermediate-radius exciton. Special attention is paid to the correlation between the average ion's valence and parameters of the low-energy excitation in the neutron spectra, such as the resonance mode, including its magnetic form factor. Along with specific features of the formation of the intermediate-valence state for Sm and Eu ions, common physical mechanisms have been revealed for systems based on these elements from the middle of the rare-earth series. A consistent description of the existing experimental data has been obtained by using the concept of a loosely bound hole for the Eu f-electron shell in the intermediate-valence state, in analogy with the previously established loosely bound electron model for the Sm ion.

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