Lattice dynamics in the Kondo insulator YbB 12

The phonon dispersion in the Kondo-insulator YbB 12 and its structure analogue LuB 12 has been studied in a wide energy range (up to 55 meV) by means of inelastic neutron scattering. The specific shape of phonon dispersion curves for low-frequency lattice vibrations could be described on the basis o...

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Published inJournal of solid state chemistry Vol. 179; no. 9; pp. 2895 - 2899
Main Authors Nemkovski, K.S., Alekseev, P.A., Mignot, J.-M., Rybina, A.V., Iga, F., Takabatake, T., Shitsevalova, N.Yu, Paderno, Yu.B., Lazukov, V.N., Nefeodova, E.V., Tiden, N.N., Sadikov, I.P.
Format Journal Article
LanguageEnglish
Published Elsevier Inc 2006
Subjects
Dodecaborides
Inelastic neutron scattering
Kondo insulator
Phonons
Kondo insulator
Dodecaborides
Phonons
Inelastic neutron scattering
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Summary:The phonon dispersion in the Kondo-insulator YbB 12 and its structure analogue LuB 12 has been studied in a wide energy range (up to 55 meV) by means of inelastic neutron scattering. The specific shape of phonon dispersion curves for low-frequency lattice vibrations could be described on the basis of a strong hierarchy suggested for the interactions between boron and rare-earth (RE) atoms: B–B⪢B–RE⪢RE–RE. Energy dispersion of phonons in the Kondo insulator YbB 12 (open symbols) and its structure analogue LuB 12 (closed symbols). Circles: longitudinal branches; triangles: transverse branches. Lines represent the result of the model calculation based on assumption of a strong hierarchy of the interactions between boron and rare-earth (RE) atoms: B–B⪢B–RE⪢RE–RE. Irreducible representations of phonon branches are given in the Bouckaert–Smoluchowski–Wigner notation.
ISSN:0022-4596
1095-726X
DOI:10.1016/j.jssc.2006.01.061