SPIN DYNAMICS IN K-DOPED POLYACETYLENE

The proton spin-lattice relaxation time (T-1) of a stretched K-doped p olyacetylene sample has been measured as a function of the frequency. The data are in agreement with the relaxation due to a pseudo-1D diffu sion of-the charge carrier spins, with an intrachain spin diffusion ra te D-parallel to approximate to 3 x 10(16) rad s(-1) and a very high a nisotropy D-parallel to/D-perpendicular to similar to 10(5). This lead s to a microscopic intrachain conductivity, sigma(parallel to) 1 x 10( 4) S cm(-1), consistent with the macroscopic dc value, sigma(DC) = 1.1 x 10(3) S cm(-1). An alternative interpretation of the data in terms of nuclear relaxation due to fixed electronic spins is not excluded.