Abstract
A chemically synthesized graphitic material where the structural coherence between the layers is missing approximates very well the assembly of graphene sheets. Our multi-frequency (9.4–420GHz) electron spin resonance (ESR) study clearly identifies itinerant and localized electrons below 50K. The metallic signal ascribed to the conduction electrons in graphene is characterized by a remarkably long spin lifetime of 65ns. Above this temperature incoherent in-plane and inter-plane scattering give a motionally narrowed single line at g=2.0044.
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