Absence of Acoustic Phonon Anomaly in a Kagome Metal with Short-ranged Structural Modulation
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866912081228333056 |
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| author | Yao, Weiliang Liu, Supeng Xu, Zifan Ishikawa, Daisuke Wang, Zehao Gao, Bin Xu, Sijie Ye, Feng Hashimoto, Kenichiro Shibauchi, Takasada Baron, Alfred Q. R. Dai, Pengcheng |
| author_facet | Yao, Weiliang Liu, Supeng Xu, Zifan Ishikawa, Daisuke Wang, Zehao Gao, Bin Xu, Sijie Ye, Feng Hashimoto, Kenichiro Shibauchi, Takasada Baron, Alfred Q. R. Dai, Pengcheng |
| contents | Kagome lattice $A$V$_3$Sb$_5$ ($A$ = K, Rb, and Cs) superconductors without magnetism from vanadium $d$-electrons are intriguing because they have a novel charge density wave (CDW) order around 90 K and display superconductivity at $\sim$3 K that competes with the CDW order. Recently, CsCr$_3$Sb$_5$, isostructural to $A$V$_3$Sb$_5$, was found to have concurrent structural and magnetic phase transition at $T^{\ast}\approx$ 55 K that can be suppressed by pressure to induce superconductivity [Liu \textit{et al.}, \href{https://doi.org/10.1038/s41586-024-07761-x}{Nature \textbf{632}, 1032 (2024)}]. Here, we use elastic and inelastic X-ray scattering to study the microscopic origin of the structural transition in CsCr$_3$Sb$_5$. Although our elastic measurements confirm the 4$\times$1$\times$1 superlattice order below $T^{\ast}$, its underlying correlation is rather short-ranged. Moreover, our inelastic measurements at the superlattice wavevectors around (3, 0, 0) find no evidence of a significant acoustic phonon anomaly below $T^{\ast}$, similar to the case of $A$V$_3$Sb$_5$. The absence of acoustic phonon anomaly indicates a weak electron-phonon coupling in CsCr$_3$Sb$_5$, suggesting that the structural transition is likely associated with an unconventional CDW order. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2410_16465 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Absence of Acoustic Phonon Anomaly in a Kagome Metal with Short-ranged Structural Modulation Yao, Weiliang Liu, Supeng Xu, Zifan Ishikawa, Daisuke Wang, Zehao Gao, Bin Xu, Sijie Ye, Feng Hashimoto, Kenichiro Shibauchi, Takasada Baron, Alfred Q. R. Dai, Pengcheng Strongly Correlated Electrons Materials Science Kagome lattice $A$V$_3$Sb$_5$ ($A$ = K, Rb, and Cs) superconductors without magnetism from vanadium $d$-electrons are intriguing because they have a novel charge density wave (CDW) order around 90 K and display superconductivity at $\sim$3 K that competes with the CDW order. Recently, CsCr$_3$Sb$_5$, isostructural to $A$V$_3$Sb$_5$, was found to have concurrent structural and magnetic phase transition at $T^{\ast}\approx$ 55 K that can be suppressed by pressure to induce superconductivity [Liu \textit{et al.}, \href{https://doi.org/10.1038/s41586-024-07761-x}{Nature \textbf{632}, 1032 (2024)}]. Here, we use elastic and inelastic X-ray scattering to study the microscopic origin of the structural transition in CsCr$_3$Sb$_5$. Although our elastic measurements confirm the 4$\times$1$\times$1 superlattice order below $T^{\ast}$, its underlying correlation is rather short-ranged. Moreover, our inelastic measurements at the superlattice wavevectors around (3, 0, 0) find no evidence of a significant acoustic phonon anomaly below $T^{\ast}$, similar to the case of $A$V$_3$Sb$_5$. The absence of acoustic phonon anomaly indicates a weak electron-phonon coupling in CsCr$_3$Sb$_5$, suggesting that the structural transition is likely associated with an unconventional CDW order. |
| title | Absence of Acoustic Phonon Anomaly in a Kagome Metal with Short-ranged Structural Modulation |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2410.16465 |