Crossover in electrical frequency response through an insulator-metal transition

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

doi:10.1103/PhysRevLett.77.2766

Crossover in electrical frequency response through an insulator-metal transition

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

Department of Physics

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87 Citations (Scopus)

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 T-dependent dc conductivity (σ_dc). We determine that the IMT is not monotonic with increasing σ_dc(RT). The RT far infrared scattering time (τ) becomes unusually long (≥ 10⁻¹³s) as σ_dc(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 language	English
Pages (from-to)	2766-2769
Number of pages	4
Journal	Physical review letters
Volume	77
Issue number	13
DOIs	https://doi.org/10.1103/PhysRevLett.77.2766
Publication status	Published - 1996

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Physics and Astronomy(all)

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10.1103/PhysRevLett.77.2766

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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 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.",

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AU - Joo, J.

AU - Min, Y. G.

AU - Epstein, A. J.

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N2 - 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.

AB - 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.

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Crossover in electrical frequency response through an insulator-metal transition

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