Spin dynamics of 4f electrons in CeB6 studied by muon spin relaxation

The fluctuation rate of Ce-4f moments in the paramagnetic phase of CeB6 nea r zero field was determined by longitudinal muon spin relaxation. The rate scales perfectly with resistivity in the entire paramagnetic phase, indicat ing that the fluctuation is predominantly determined by the Kondo effect. T he absence of magnetic order in the presumed antiferro-quadrupolar (AFQ) ph ase was also confirmed, while no evidence for coupling between the AFQ orde r parameter and electric field gradient at the B site was found near zero f ield by the muon nuclear level-crossing resonance technique.