High resolution 13C NMR investigation in the organic conductor : (TMTSF)2ClO4

We report the results of 13 C NMR magic angle spinning experiments performed on the TMTSF molecule (in solution and in the solid state) and in the organic conductor (TMTSF) 2 ClO 4 . This investigation (Knight-shift, T 1 and T 1ρ ) has allowed to resolve all individual sites of the organic molecule. Strong and widely distributed enhancements of the relaxation rate of the nuclear spin on different sites of the molecule suggest a picture where Coulomb correlations play a major role for the sites at the corners of the molecule Etude de la RMN de 13 C, avec rotation a l'angle magique, pour la molecule TMTSF, en solution et a l'etat solide, et le conducteur organique. Identification de tous les sites individuels de la molecule a partir du deplacement de Kinght, de T 1 et T 1ρ . Observation d'une large distribution et d'une forte augmentation du taux de relaxation des spins des differents sites en relation avec le role important joue par les interactions coulombiennes