Lattice dynamics of intermediate valence semiconductor SmB6

P. A. Alekseev, A. S. Ivanov, B. Dorner, H. Schober, K. A. Kikoin, A. S. Mishchenko, V. N. Lazukov, E. S. Konovalova, Yu B. Paderno, A. Yu Rumyantsev, I. P. Sadikov

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70 Scopus citations

Abstract

All acoustic and the lowest optic branches in three main symmetry directions have been determined by inelastic neutron scattering at room temperature using a double isotope monocrystal154Sm11B6. In comparison with the integer valence system LaB6the phonons are softer, and the LA branches exhibit remarkable anomalies. These features are interpreted on the basis of a specific coupling of the lattice vibrations with the dipole (f-d) and monopole (f-f) excitations of the Sm shells, the latter being characteristic for the mixed valence semiconductor. A weak broad signal has been observed in the energy gap between acoustic and optic modes, which can be ascribed to an additional mode appearing due to the nonadiabatic interaction of phonons with valence fluctuations.

Original languageEnglish
Pages (from-to)457-463
Number of pages7
JournalEPL
Volume10
Issue number5
DOIs
StatePublished - 1 Nov 1989
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (all)

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