MAGNETIC EXCITATION SPECTRUM OF MIXED-VALENCE SMB6 STUDIED BY NEUTRON-SCATTERING ON A SINGLE-CRYSTAL

Citation
Pa. Alekseev et al., MAGNETIC EXCITATION SPECTRUM OF MIXED-VALENCE SMB6 STUDIED BY NEUTRON-SCATTERING ON A SINGLE-CRYSTAL, Journal of physics. Condensed matter, 7(2), 1995, pp. 289-305
Citations number
32
Categorie Soggetti
Physics, Condensed Matter
ISSN journal
09538984
Volume
7
Issue
2
Year of publication
1995
Pages
289 - 305
Database
ISI
SICI code
0953-8984(1995)7:2<289:MESOMS>2.0.ZU;2-Y
Abstract
The paramagnetic response of mixed-valence samarium hexaboride has bee n studied by inelastic neutron scattering using a low-absorption doubl e-isotope single crystal of (SmB6)-Sm-154-B-11. Measurements were perf ormed for energy transfers 0 less than or equal to h omega less than o r equal to 50 meV at temperatures ranging from 2 to 100 K. Two main co ntributions were observed in the spectra: a broad intermultiplet trans ition of single-ion type at h omega similar or equal to 36 meV, and a narrow low-energy excitation centred at h omega similar or equal to 14 meV, which is strongly anisotropic and temperature dependent and exhi bits a weak but visible dispersion. The latter excitation appears to b e an inherent feature of the mixed-valence state due to f-electron hyb ridization effects, which denotes the formation of a local bound state around the Sm sites.