Abstract

A high doping concentrations, polyacetylene undergoes a transformation into a state characterized by high d.c. conductivity, by a large Pauli susceptibility and by the absence of the interband transition of the updoped polymer. The optical spectrum shows a pseudogap at ≈0.2 eV and vibrational modes which imply that the carbon-carbon bond length is not uniform. We conclude that this state is best described as a gapless incommensurate Peierls insulator.

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