Publication Type
Journal
Journal Name
Physical Review Letters
Publication Date
Page Number
036401
Volume
114
Abstract
Using inelastic neutron scattering, we map a 14 meV resonant mode in SmB6 and describe its
relation to the low energy insulating band structure. The resonant intensity is sharply con ned to
the X and R high symmetry points and disperses less than 2 meV through the zone. Repeating
outside the rst Brillouin zone, the mode is coherent with a 5d-like magnetic form factor. We
describe how band inversion in cubic symmetry can be inferred from neutron scattering and show
that a slave boson treatment of a 3rd-neighbor dominated hybridized 2 species (d/f) band structure
can produce a spin exciton with the observed characteristics.
