Collective magnetic excitations in mixed-valence Sm0.83Y0.17S
arXiv:cond-mat/0112328 · doi:10.1103/PhysRevB.65.153201
Abstract
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 accounting for the existence of sizeable Sm-Sm exchange interactions, and a microscopic mechanism is proposed on the basis of the "local-bound-state" theory developed previously for SmB6.
6 pages in pdf format, 3 figures, submitted to Phys. Rev. B
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