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- W2081736754 abstract "The transport properties of ${mathrm{H}}_{2}$ ${mathrm{SO}}_{4}$ -doped, tensile drawn, and oriented poly(phenylenevinylene) have been studied in the metallic, critical, and insulating regimes of the disorder-induced metal-insulator transition (M-I) transition. The temperature dependence of the conductivity, ensuremath{sigma}(T) and the magnetoconductance (MC) were investigated between room temperature and 1.3 K and in magnetic fields up to 8 T, in freshly doped samples and in samples during controlled dedoping (aging). A complete set of measurements were carried out on a single, fully doped sample that was followed during ageing from the metallic state through the critical regime into the insulting state. The transport properties are characterized as a function of the resistivity ratio (${mathrm{ensuremath{rho}}}_{mathrm{r}}$), where ${mathrm{ensuremath{rho}}}_{mathrm{r}}$=[ensuremath{rho}(1.3 K)/ensuremath{rho}(200 K)]. In the metallic regime (${mathrm{ensuremath{rho}}}_{mathrm{r}}$2), ${mathrm{ensuremath{sigma}}}_{mathrm{ensuremath{parallel}}}$ (300 K)ensuremath{cong}10 000 S/cm and ${mathrm{ensuremath{sigma}}}_{mathrm{ensuremath{perp}}}$ (300 K)ensuremath{cong}100 S/cm; for T4 K, a ${mathrm{T}}^{1mathrm{/}2}$ dependence is observed for ensuremath{sigma}(T), and the MC shows positive and negative contributions at low and high fields, respectively. The positive contribution to the MC vanishes at the M-I transition boundary (${mathrm{ensuremath{rho}}}_{mathrm{r}}$ensuremath{cong}2). The behaviors of ensuremath{sigma}(T)and the MC are consistent with the weak localization plus electron-electron interaction model. Very near the M-I transition, a field-induced transition from the metallic to the critical regime was observed {ensuremath{sigma}(T)ensuremath{propto}${mathrm{T}}^{0.1}$ at 8 T}. For samples in the critical regime with 4${mathrm{ensuremath{rho}}}_{mathrm{r}}$30, ensuremath{sigma}(T)ensuremath{propto}${mathrm{T}}^{mathrm{ensuremath{mathrm{B}}}}$ at low temperatures. In the insulating state (${mathrm{ensuremath{rho}}}_{mathrm{r}}$>50), ensuremath{rho}(T)ensuremath{propto}exp(${mathrm{T}}_{0}$/T${)}^{mathrm{x}}$ indicating variable-range-hopping transport. Although anisotropic, the field and temperature dependences of the transport are similar both parallel and perpendicular to the chain axis, implying that oriented conducting polymers are anisotropic three-dimensional conductors." @default.
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- W2081736754 date "1997-03-15" @default.
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- W2081736754 title "Metal-insulator transition in oriented poly(p-phenylenevinylene)" @default.
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- W2081736754 doi "https://doi.org/10.1103/physrevb.55.6777" @default.
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