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- W2068849974 abstract "The origin of the very low and glasslike lattice thermal conductivity $({ensuremath{kappa}}_{L})$ in highly crystalline clathrates has been intensely discussed. Guest atom tunneling, guest atom resonant scattering, disorder scattering, and soft potentials have been proposed as possible explanations. However, none of these models can explain the fundamental difference in ${ensuremath{kappa}}_{L}$ between $n$- and $p$-type ${mathrm{Ba}}_{8}{mathrm{Ga}}_{16}{mathrm{Ge}}_{30}$. Here we provide a comprehensive explanation through analysis of the physical properties of a range of ${mathrm{Ba}}_{8}{mathrm{In}}_{16ensuremath{-}x}{mathrm{Ge}}_{30ensuremath{-}y}{◻}_{x+y}$ and ${mathrm{Ba}}_{8}{mathrm{Ni}}_{6ensuremath{-}x}{mathrm{Ge}}_{40+x}$ samples. We show that ${ensuremath{kappa}}_{L}$ is intimately linked to the charge carriers, and propose that the glasslike ${ensuremath{kappa}}_{L}$ is a consequence of strong phonon charge carrier coupling. In general the influence of charge carriers on ${ensuremath{kappa}}_{L}$ has been studied only in relatively lightly doped and structurally ordered semiconducting materials. Clathrates constitute a class of materials with relatively large charge carrier concentrations in combination with structural disorder. This opens up the possibility of studying the influence of charge carriers on ${ensuremath{kappa}}_{L}$ in the limit where ${ensuremath{kappa}}_{L}$ and ${ensuremath{kappa}}_{e}$ are of equal magnitude." @default.
- W2068849974 created "2016-06-24" @default.
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- W2068849974 date "2006-03-02" @default.
- W2068849974 modified "2023-09-25" @default.
- W2068849974 title "Strong phonon charge carrier coupling in thermoelectric clathrates" @default.
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- W2068849974 doi "https://doi.org/10.1103/physrevb.73.094301" @default.
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