TY  - JOUR
AU  - Savchenkov, P. S.
AU  - Alekseev, P. A.
AU  - Podlesnyak, A.
AU  - Kolesnikov, A. I.
AU  - Nemkovski, K. S.
TI  - Intermediate-valence state of the Sm and Eu in SmB$_{6}$ and EuCu$_{2}$Si$_{2}$ : neutron spectroscopy data and analysis
JO  - Journal of physics / Condensed matter
VL  - 30
IS  - 5
SN  - 1361-648X
CY  - Bristol
PB  - IOP Publ.
M1  - FZJ-2018-01886
SP  - 055801 -
PY  - 2018
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000422729600001
DO  - DOI:10.1088/1361-648X/aaa1aa
UR  - https://juser.fz-juelich.de/record/844471
ER  -