Collective magnetic excitations in mixed-valence Sm0.83Y0.17S

P. A. Alekseev, J. M. Mignot, A. Ochiai, E. V. Nefeodova, I. P. Sadikov, E. S. Clementyev, V. N. Lazukov, Markus Braden, K. S. Nemkovski

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


The magnetic spectral response of black-phase mixed-valence SM0.83Y0.17S has been measured by inelastic neutron scattering on a single crystal. Two magnetic peaks are observed in the energy range of the Sm2+ spin-orbit transition (25-40 meV). Both of them exhibit significant dispersion along the three main symmetry directions, reminiscent of the spin-orbit exciton branch found in pure divalent SmS. The results can be reproduced by a simple phenomenological model taking into account the existence of sizable Sm-Sm exchange interactions, and a microscopic mechanism is proposed on the basis of the "local-bound-state" theory developed previously for SmB6.

Original languageEnglish
Article number153201
Pages (from-to)1532011-1532014
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number15
Publication statusPublished - 2002 Apr 15
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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