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- W2315842340 endingPage "1776" @default.
- W2315842340 startingPage "1762" @default.
- W2315842340 abstract "Analysis of experimental curves for the electrical conductivity $ensuremath{sigma}$ and thermopower $S$ of ${mathrm{Tl}}_{x}{mathrm{Te}}_{1ensuremath{-}x}$ alloys near the composition ${mathrm{Tl}}_{2}$Te has yielded a quantitative description of the pseudogap. A model expressed in terms of two bands with a negative temperature coefficient for the band gap has been fitted with parameters which yield very good agreement with the experimental curves. The theoretical expressions for $S$ and $ensuremath{sigma}$ are based on the diffusive mechanism for transport, according to which the conductivity at a given energy $ensuremath{sigma}(E)$ is proportional to the square of the density of states $N(E)$. The effect of the mobility shoulder is to cut off $ensuremath{sigma}(E)$ at the mobility edges. For the conduction band, it is found that the density of states ${N}_{c}(E)$ is parabolic. The mobility edge ${E}_{c1}$ is within $mathrm{kT}$ of the band edge ${E}_{c0}$, and is therefore not experimentally discernible. For the valence band, the results are more ambiguous. A parabolic density of states ${N}_{v}(E)$ yields fairly accurate results, and we deduce a value ensuremath{sim}0.20 eV for the distance of the mobility edge ${E}_{v1}$ from the band edge ${E}_{v0}$, but there are some uncertainties associated with both of these results. At $T>770$ ifmmode^circelsetextdegreefi{}K, the band gap becomes negative. In accordance with Mott's observation that localized and nonlocalized states cannot overlap in energy, our model takes $ensuremath{sigma}(E)ensuremath{propto}{[{N}_{c}(E)+{N}_{v}(E)]}^{2}$, and localized valence-band states become conducting when their energies rise above the conduction-band mobility edge." @default.
- W2315842340 created "2016-06-24" @default.
- W2315842340 creator A5020846204 @default.
- W2315842340 date "1974-02-15" @default.
- W2315842340 modified "2023-09-26" @default.
- W2315842340 title "Pseudogap of liquidTl2Te" @default.
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- W2315842340 doi "https://doi.org/10.1103/physrevb.9.1762" @default.
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