Electronic and ionic conductivities in superionic Li$_4$C$_{60}$
D. Quintavalle,
B. G. Márkus,
A. Jánossy
et al.
Abstract:The 10 GHz microwave conductivity, σ(T ) and high field, 222 GHz electron spin resonance (HF-ESR) of Li4C60 fulleride is measured in a wide temperature range. We suggest that the majority of ESR active sites and at least some of the charge carriers for σ(T ) are electrons bound to a small concentration of surplus or vacancy ions in the polymer phase. Both σ(T ) and the ESR line shape depend on ionic motion. A change of the activation energy of σ(T ) at 125 K coincides with the onset of the ionic DC conductivit… Show more
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