Reorientational dynamics of C60 in the solid state. An avoided level-crossing muon spin resonance study

Abstract The dynamics of the muonium (Mu) adduct to C 60 in the crystalline state have been investigated using avoided level crossing muon spin resonance (ALC-μSR). The motion of C 60 in the orientationally ordered phase ( T −12 s. This is in striking contrast to the behaviour of MuC 70 adducts whose reorientational motion fits well in a pseudo-static model with a temperature dependent order parameter.