Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hopping Processes Explain T-linear Rise of Thermal Conductivity in
  Thermoelectric Clathrates above the Plateau   Type-I clathrate compounds with off-center guest ions realize the
phonon-glass electron-crystal concept by exhibiting almost identical lattice
thermal conductivities $\kappa_{\rm L}$ to those observed in network-forming
glasses. This is in contrast with type-I clathrates with on-center guest ions
showing $\kappa_{\rm L}$ of conventional crystallines. Glasslike $\kappa_{\rm
L}$ stems from the peculiar THz frequency dynamics in off-center type-I
clathrates where there exist three kinds of modes classified into extended(EX),
weakly(WL) and strongly localized(SL) modes as demonstrated by Liu $et.\,al.$,
Phys. Rev. B $\textbf{93}$, 214305(2016). Our calculated results based on the
hopping mechanism of SL modes via anharmonic interactions show fairly good
agreement with observed ${\it T}$-linear rise of $\kappa_{\rm L}$ above the
plateau. We emphasize that both the magnitude and the temperature dependence
are in accord with the experimental data of off-center type-I clathrates.

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The categories of this paper are: nucl-th
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The categories of this paper are: q-bio
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The categories of this paper are: hep-ex
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The categories of this paper are: q-fin
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The categories of this paper are: dg-ga
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The categories of this paper are: atom-ph
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The categories of this paper are: nlin
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The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con
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The categories of this paper are: bayes-an
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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: eess
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The categories of this paper are: funct-an
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The categories of this paper are: physics