Electronic States And Molecular Dynamics Of Single-Component Molecular Conductors [M(Tmdt)(2)] (M = Ni, Pt) Studied By C-13 And (Hnmr)-H-1

The molecular conductors [M(tmdt)(2)] (M = Ni, Pt) consisting of single molecular species are investigated with C-13 NMR and H-1 NMR. The temperature dependences of the C-13 NMR shift and relaxation rate provide microscopic evidence for the metallic nature with appreciable electron correlations. Both compounds exhibit an anomalous frequency-dependent enhancement in the H-1 nuclear spin-lattice relaxation rate in a wide temperature range. These observations signify the presence of extraordinary molecular motions with low energy excitations.