MAGNETIC-RESONANCE AND RESISTIVITY STUDIES ON POLYACETYLENE - SOLITON DYNAMICS AND METALLIC CONDUCTION

We have summarized the experimental work on polyacetylene problems done at Tokyo Metropolitan University over these ten years. First, the soliton dynamics in transpolyacetylene was studied by the frequency dependence experiment of T1(-1) and T2(-1) of ESR. In contrast with the corresponding NMR studies, the interpretation of ESR results was unique. The obtained diffusion rate D// was approximately 1 x 10(13) sec-1 at room temperature. A T2-law appeared to hold in the temperature dependence of D//. Second, the metallic nature of inside of fibrils in heavily-doped polyacetylene was studied by the VSC electrical resistance experiment and the NMR method. The metallic temperature dependence of resistivity proportional to T2 (or T) was observed over wide temperature range.