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Title: Intermediate-valence state of the Sm and Eu in SmB 6 and EuCu 2 Si 2 : neutron spectroscopy data and analysis

Abstract

For this study, magnetic neutron scattering data for Sm (SmB 6, Sm(Y)S) and Eu (EuCu 2Si 2- x Ge 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.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [3]
  1. National Research Nuclear Univ. MEPhI (Moscow Engineering Physics Inst.) (Russia); National Research Centre (NRC), Moscow (Russian Federation). Kurchatov Inst. (NRCKI)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
  3. Jülich Center for Neutron Science (JCNS) at Heinz Maier-Leibnitz Center (MLZ), Garching (Germany)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Research Nuclear Univ. MEPhI (Moscow Engineering Physics Inst.) (Russia)
OSTI Identifier:
1427612
Grant/Contract Number:  
AC05-00OR22725; 02.a03.21.0005
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Physics. Condensed Matter
Additional Journal Information:
Journal Volume: 30; Journal Issue: 5; Journal ID: ISSN 0953-8984
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; neutron spectroscopy; magnetic form factor; intermediate valence; rare-earth compounds; intermultiplet transitions

Citation Formats

Savchenkov, P. S., Alekseev, P. A., Podlesnyak, A., Kolesnikov, A. I., and Nemkovski, K. S. Intermediate-valence state of the Sm and Eu in SmB 6 and EuCu 2 Si 2 : neutron spectroscopy data and analysis. United States: N. p., 2018. Web. doi:10.1088/1361-648X/aaa1aa.
Savchenkov, P. S., Alekseev, P. A., Podlesnyak, A., Kolesnikov, A. I., & Nemkovski, K. S. Intermediate-valence state of the Sm and Eu in SmB 6 and EuCu 2 Si 2 : neutron spectroscopy data and analysis. United States. doi:10.1088/1361-648X/aaa1aa.
Savchenkov, P. S., Alekseev, P. A., Podlesnyak, A., Kolesnikov, A. I., and Nemkovski, K. S. Thu . "Intermediate-valence state of the Sm and Eu in SmB 6 and EuCu 2 Si 2 : neutron spectroscopy data and analysis". United States. doi:10.1088/1361-648X/aaa1aa. https://www.osti.gov/servlets/purl/1427612.
@article{osti_1427612,
title = {Intermediate-valence state of the Sm and Eu in SmB 6 and EuCu 2 Si 2 : neutron spectroscopy data and analysis},
author = {Savchenkov, P. S. and Alekseev, P. A. and Podlesnyak, A. and Kolesnikov, A. I. and Nemkovski, K. S.},
abstractNote = {For this study, magnetic neutron scattering data for Sm (SmB6, Sm(Y)S) and Eu (EuCu2Si2-x Ge 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.},
doi = {10.1088/1361-648X/aaa1aa},
journal = {Journal of Physics. Condensed Matter},
issn = {0953-8984},
number = 5,
volume = 30,
place = {United States},
year = {2018},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

Figure 1 Figure 1: Energy dependence of the ground state Eg as a function of average valence $ν$ for (a) different hybridization parameters M (C = 1.8); and for (b) different Coulomb interactions C (M = 1.0).

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.