Intermediate-valence state of the Sm and Eu in SmB 6 and EuCu 2 Si 2 : neutron spectroscopy data and analysis
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- National Research Nuclear Univ. MEPhI (Moscow Engineering Physics Inst.) (Russia); National Research Centre (NRC), Moscow (Russian Federation). Kurchatov Inst. (NRCKI)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
- Jülich Center for Neutron Science (JCNS) at Heinz Maier-Leibnitz Center (MLZ), Garching (Germany)
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.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); National Research Nuclear Univ. MEPhI (Moscow Engineering Physics Inst.) (Russia)
- Grant/Contract Number:
- AC05-00OR22725; 02.a03.21.0005
- OSTI ID:
- 1427612
- Journal Information:
- Journal of Physics. Condensed Matter, Vol. 30, Issue 5; ISSN 0953-8984
- Publisher:
- IOP PublishingCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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