Abstract
Lineshape analysis of 13C NMR spectra was obtained thanks to superconductive solenoid giving a 6 T field. Stage II donors compounds show essentially the same lines and shifts, with two kinds of carbon atoms. Higher stage compounds reveal a graphite's line, resulting from non-first neighbours C planes, which is not shifted but has a shortened T 1, due to a small electron doping. These results support the model of a peak of density of states near the Fermi level for the sandwich of alkaline atoms between the two first neighbouring C planes; meanwhile other C planes would be better described in the rigid band model. Then each C plane has its own bandshape. The negligible Knight shift in acceptor compounds is explained by the very small perturbation of the density of states near the Fermi level. The coupling with the intercalant molecules would change the bandshape far from the Fermi level.
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