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- W2079581844 abstract "Abstract The energy gap and charge conduction mechanism of (NMP)x(Phen)1-x(TCNQ) with x between 0.5 and 0.6, a range where this large U system evolves from a commensurate (x lsim; 0.57) to an incommensurate (x ≳ 0.57) Peierls insulator, have been studied with infrared and transport measurements. The conductivity and infrared absorption studies show that the low temperature gap is 0.1 to 0.15 eV. The weak T-dependence of this gap reflects contributions from both the Peierls order parameter and an external periodic potential due to ordering of the NMP+ and Phen* in the donor stack, Δe. The oscillator strengths of the low frequency phonon modes provide a measure of the T-dependence of the order parameter, Δ (T). The results are in agreement with a calculation of Conwell and Howard of the Peierls distortion Δ (T) in the presence of a small Δe The T-dependent thermopower S(T) varies markedly with x. This behavior implies an important hole type conduction despite the presence of excess electrons, in accord with charge conduction at the soliton level, though a large asymmetry in electron and hole mobilities may have a role." @default.
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- W2079581844 date "1985-03-01" @default.
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- W2079581844 title "Electronic Properties of (NMP)X(PHEN)1-x(TCNQ)" @default.
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- W2079581844 doi "https://doi.org/10.1080/00268948508075757" @default.
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