Abstract
Proton spin lattice relaxation times T 1 have been measured in the frequency range 7–95 MHz on a set of unstretched and stretched polyaniline films, together with d.c. conductivity. A highly anisotropic quasi 1D spin diffusion is evidenced in all the samples. It is shown that while stretching increases parallel d.c. conductivity, it favours interchain hoppings at the microscopic scale. These results are interpreted in a coherent picture that links the macroscopic transport properties to the microscopic ones. In particular, d.c. conductivity anisotropy is shown to be of geometrical nature when the microscopic transport anisotropy is very high. It is also concluded that the carrier mean free path is not consistent with metallic conductivity.
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