Abstract
The magnetic spectral response of black-phase mixed-valence has been measured by inelastic neutron scattering on a single crystal. Two magnetic peaks are observed in the energy range of the 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
- Received 17 December 2001
DOI:https://doi.org/10.1103/PhysRevB.65.153201
©2002 American Physical Society