Crossover in electrical frequency response through an insulator-metal transition

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

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Abstract

The insulator-metal transition (IMT) for a model quasi-one-dimensional (quasi-ID) 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 (≥ 10-13 s) 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-ID localization rather than 3D Andersen localization.

Original languageEnglish
Pages (from-to)2766-2769
Number of pages4
JournalPhysical Review Letters
Volume77
Issue number13
Publication statusPublished - 1996 Dec 1

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Kohlman, R. S., Joo, J., Min, Y. G., MacDiarmid, A. G., & Epstein, A. J. (1996). Crossover in electrical frequency response through an insulator-metal transition. Physical Review Letters, 77(13), 2766-2769.