| Autor: |
Shen, Xingchen, Heid, Rolf, Hott, Roland, Salzmann, Björn, Cantarino, Marli dos Reis, Monney, Claude, Said, Ayman H., Murphy, Bridget, Rossnagel, Kai, Rosenkranz, Stephan, Weber, Frank |
| Rok vydání: |
2022 |
| Předmět: |
|
| Zdroj: |
Nature Communications 2023 Vol. 14 Issue 1 Pages 7282 |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1038/s41467-023-43094-5 |
| Popis: |
Research on charge-density-wave (CDW) ordered transition-metal dichalcogenides continues to unravel new states of quantum matter correlated to the intertwined lattice and electronic degrees of freedom. Here, we report an inelastic x-ray scattering investigation of the lattice dynamics of the canonical CDW compound $2H$-TaSe$_2$ complemented by angle-resolved photoemission spectroscopy. Our results rule out the central-peak scenario for the CDW transition in $2H$-TaSe$_2$ and provide evidence for a novel precursor phase above the CDW transition temperature $T_{CDW}$. The phase at temperatures between $T^{*}\,(= 128.7\,,\rm{K})$ and $T_{CDW}\,(= 121.3\,\rm{K})$ is characterized by a fully softened phonon mode and medium-range ordered ($\xi_{corr} = 100\,\rm{\mathring{A}}- 200\,\rm{\mathring{A}})$ static CDW domains. Only $T_{CDW}$ is detectable in our photoemission experiments. Thus, $2H$-TaSe$_2$ exhibits structural before electronic static order and emphasizes the important lattice contribution to CDW transitions. |
| Databáze: |
arXiv |
| Externí odkaz: |
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