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      Charge fluctuations above \(T_\mathrm{CDW}\) revealed by glasslike thermal transport in kagome metals \(A\)V\(_3\)Sb\(_5\) (\(A\) = K, Rb, Cs)

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          Abstract

          We present heat capacity, electrical and thermal transport measurements of kagome metals \(A\)V\(_3\)Sb\(_5\) (\(A\) = K, Rb, Cs). In all three compounds, development of short-range charge fluctuations above the charge density wave (CDW) transition temperature \(T_\mathrm{CDW}\) strongly scatters phonons via electron-phonon coupling, leading to glasslike phonon heat transport, i.e., phonon thermal conductivity decreases weakly upon cooling. Once the long-range charge order sets in below \(T_\mathrm{CDW}\), short-range charge fluctuations are quenched, and the typical Umklapp scattering dominated phonon heat transport is recovered. The charge-fluctuations-induced glasslike phonon thermal conductivity implies sizable electron-phonon coupling in \(A\)V\(_3\)Sb\(_5\).

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          Author and article information

          Journal
          08 November 2022
          Article
          2211.04216
          5ed9eaf5-fe1c-40bc-a33a-950d7d3bb1e3

          http://creativecommons.org/licenses/by-nc-nd/4.0/

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          Custom metadata
          8 pages, 5 figures
          cond-mat.supr-con

          Condensed matter
          Condensed matter

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