First evidence for a Sm 3+-type contribution to the magnetic form factor in the quasielastic spectral response of intermediate valence SmB6
P. A. Alekseev+*, J.-M. Mignot×, P. S. Savchenkov+*, V. N. Lazukov+
+National Research Centre "Kurchatov Institute", 123182 Moscow, Russia
*National Research Nuclear University MEPhI, 115409 Moscow, Russia
×Laboratoire Léon Brillouin - UMR12 CNRS-CEA, CEA Saclay, 91191 Gif-sur-Yvette, France
Abstract
The momentum transfer dependence of the magnetic form factor associated with the
quasielastic spectral component in the dynamic magnetic response of intermediate valence
SmB6 has been measured using inelastic neutron scattering on a double-isotope (154Sm,
11B)
single crystal. The experimental dependence differs qualitatively from those obtained earlier
for the inelastic signals, as well as from the field-induced magnetic form factor of SmB6
obtained by polarized neutron diffraction. This observation is interpreted by specifically
considering the Curie-type contributions to the dynamic susceptibility, which arise from the
mixing of 4f5 and 4f6 J-multiplets into the intermediate valence state wave function.