Intermediate-valence state of the Sm and Eu in SmB 6 and EuCu 2 Si 2 : neutron spectroscopy data and analysis
Magnetic neutron scattering data for Sm (SmB , Sm(Y)S) and Eu (EuCu Si Ge ) 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...
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Veröffentlicht in: | Journal of physics. Condensed matter 2018-02, Vol.30 (5), p.055801 |
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Hauptverfasser: | , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Magnetic neutron scattering data for Sm (SmB
, Sm(Y)S) and Eu (EuCu
Si
Ge
) 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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ISSN: | 0953-8984 1361-648X |
DOI: | 10.1088/1361-648X/aaa1aa |