Spin gap formation in the heavy fermion skutterudite compound CeRu4Sb12

摘要: CeRu4Sb12 is a mixed-valence Kondo-lattice system with gap of 47 meV opening in the charge excitation spectrum, measured by infrared spectroscopy technique. In order to study temperature and energy momentum dependence spin we have made inelastic neutron scattering measurements over wide range between 5 250 K an incident 100 meV. Our results at 60 show that similar to30 opens magnetic spectrum above it response forms continuum right up 95 Surprisingly, shows neither wave vector Q within our resolution nor from K. On other hand, starts fill becomes purely quasielastic higher temperatures. The dramatic change observed can be related coherence Ce 4f electrons while independence implies single-ion Kondo interactions are important formation mechanism. We discuss terms theoretical models.