Charge fluctuations above $T_\mathrm{CDW}$ revealed by glasslike thermal transport in kagome metals $A$V$_3$Sb$_5$ ($A$ = K, Rb, Cs)
2022
academicJournal
Zugriff:
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$_5$. ; Comment: 8 pages, 5 figures
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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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Autor/in / Beteiligte Person: | Yang, Kunya ; Xia, Wei ; Mi, Xinrun ; Zhang, Long ; Gan, Yuhan ; Wang, Aifeng ; Chai, Yisheng ; Zhou, Xiaoyuan ; Yang, Xiaolong ; Guo, Yanfeng ; He, Mingquan |
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Veröffentlichung: | 2022 |
Medientyp: | academicJournal |
DOI: | 10.1103/PhysRevB.107.184506 |
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