Lattice dynamics of rare-earth semiconductors with unstable valence

A. S. Mishchenko, K. A. Kikoin

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


The phonon spectra of rare-earth (RE) semiconductors with integer and mixed valence (EuS, SmS, TmSe) are calculated within the generalized charge-density distortion model. The model includes interaction of lattice vibrations with the valence shell excitations, both local (usual dipole excitations in unfilled shells of RE ions) and non-local breathing modes describing the valence fluctuations. The relative contribution of these excitations to phonon renormalization is traced along the row of RE semiconductors with rock-salt structure.

Original languageEnglish
Article number003
Pages (from-to)5937-5954
Number of pages18
JournalJournal of Physics: Condensed Matter
Issue number32
StatePublished - 1 Dec 1991
Externally publishedYes

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics


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