Crossover in electrical frequency response through an insulator-metal transition

R. S. Kohlman, J. Joo, Y. G. Min, A. J. Epstein

Research output: Contribution to journalArticlepeer-review

87 Citations (Scopus)


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 T-dependent dc conductivity (σdc). We determine that the IMT is not monotonic with increasing σdc(RT). The RT far infrared scattering time (τ) becomes unusually long (≥ 10−13s) as σdc(RT) 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.

Original languageEnglish
Pages (from-to)2766-2769
Number of pages4
JournalPhysical review letters
Issue number13
Publication statusPublished - 1996

ASJC Scopus subject areas

  • General Physics and Astronomy


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