Abstract
The insulator-metal transition (IMT) for a model quasi-one-dimensional (quasi-1D) conducting polymer (polyaniline) is probed at room temperature (RT) over an unusually broad frequency range (2 meV–6 eV) and also via -dependent dc conductivity ( ). We determine that the IMT is not monotonic with increasing . The RT far infrared scattering time ( ) becomes unusually long ( ) as increases, even for samples on the insulating side of the IMT. We conclude that the IMT is due to percolation in the presence of inhomogeneous disorder and quasi-1D localization rather than 3D Anderson localization.
- Received 2 May 1996
DOI:https://doi.org/10.1103/PhysRevLett.77.2766
©1996 American Physical Society