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- W3100208523 abstract "Glasses usually represent the lower limit for the thermal conductivity of solids, but a fundamental understanding of lattice heat transport in amorphous materials can provide design rules to beat such a limit. Here we investigate the role of mass disorder in glasses by studying amorphous silicon-germanium alloy (a-${mathrm{Si}}_{1ensuremath{-}x}{mathrm{Ge}}_{x}$) over the full range of atomic concentration from $x=0$ to $x=1$, using molecular dynamics and the quasiharmonic Green-Kubo lattice dynamics formalism. We find that the thermal conductivity of a-${mathrm{Si}}_{1ensuremath{-}x}{mathrm{Ge}}_{x}$ as a function of $x$ exhibits a smoother U shape than in crystalline mass-disordered alloys. The main contribution to the initial drop of thermal conductivity at low Ge concentration stems from the localization of otherwise extended modes that make up the lowest 8% of the population by frequency. Contributions from intermediate frequency modes are decreased more gradually with increasing Ge to reach a broad minimum thermal conductivity between concentrations of Ge from $x=0.25$ to 0.75. Modal analysis unravels the correlations among localization, line broadening, and the contribution to thermal transport of modes within different frequency ranges." @default.
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- W3100208523 date "2021-01-20" @default.
- W3100208523 modified "2023-10-16" @default.
- W3100208523 title "Mode localization and suppressed heat transport in amorphous alloys" @default.
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- W3100208523 doi "https://doi.org/10.1103/physrevb.103.024204" @default.
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