Fluctuation conductivity near a Peierls lattice distortion |
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Authors: | E.W. Fenton |
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Affiliation: | National Research Council of Canada, Ottawa K1A 0R6, Canada |
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Abstract: | There have been a number of recent theories for the fluctuation conductivity due to phonon softening near a one-dimensional Peierls lattice distortion. In these, the conductivity is evaluated for one or more Feynman response diagrams, with a resulting fluctuation conductivity which is positive, negative, or negligible. We calculate the conductivity using a conserving response theory which derives all of the response diagrams for any particular approximation to the electron propagator for the solid in thermodynamic equilibrium. Using this method in the mean-field theories to date, valid in principle for sufficiently high temperatures, the fluctuation conductivity due to phonon softening is positive and proportional to (, where Tp is the mean-field temperature scale in the one-dimensional Peierls system. This conductivity contribution is not due to the Fröhlich sliding mode. |
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