$Observation of Unconventional Charge Density Wave without Acoustic Phonon Anomaly in Kagome Superconductors AV_{3}Sb_{5} (A=Rb, Cs)$
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Observation of Unconventional Charge Density Wave without Acoustic Phonon Anomaly in Kagome Superconductors AV_{3}Sb_{5} (A=Rb, Cs)

The combination of nontrivial band topology and symmetry-breaking phases gives rise to novel quantum states and phenomena such as topological superconductivity, quantum anomalous Hall effect, and axion electrodynamics. Evidence of intertwined charge density wave (CDW) and superconducting order param...

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Autores principales:	Haoxiang Li, T. T. Zhang, T. Yilmaz, Y. Y. Pai, C. E. Marvinney, A. Said, Q. W. Yin, C. S. Gong, Z. J. Tu, E. Vescovo, C. S. Nelson, R. G. Moore, S. Murakami, H. C. Lei, H. N. Lee, B. J. Lawrie, H. Miao
Formato:	article
Lenguaje:	EN
Publicado:	American Physical Society 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/4bd26018871e4a9984ac0890d4e775cd
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spelling	oai:doaj.org-article:4bd26018871e4a9984ac0890d4e775cd2021-12-02T19:11:15ZObservation of Unconventional Charge Density Wave without Acoustic Phonon Anomaly in Kagome Superconductors AV_{3}Sb_{5} (A=Rb, Cs)10.1103/PhysRevX.11.0310502160-3308https://doaj.org/article/4bd26018871e4a9984ac0890d4e775cd2021-09-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.11.031050http://doi.org/10.1103/PhysRevX.11.031050https://doaj.org/toc/2160-3308The combination of nontrivial band topology and symmetry-breaking phases gives rise to novel quantum states and phenomena such as topological superconductivity, quantum anomalous Hall effect, and axion electrodynamics. Evidence of intertwined charge density wave (CDW) and superconducting order parameters has recently been observed in a novel kagome material AV_{3}Sb_{5} (A=K, Rb, Cs) that features a Z_{2} topological invariant in the electronic structure. However, the origin of the CDW and its intricate interplay with the topological state has yet to be determined. Here, using hard-x-ray scattering, we demonstrate a three-dimensional CDW with 2×2×2 superstructure in (Rb,Cs)V_{3}Sb_{5}. Unexpectedly, we find that the CDW fails to induce acoustic phonon anomalies at the CDW wave vector but yields a novel Raman mode that quickly damps into a broad continuum below the CDW transition temperature. Our observations exclude strong electron-phonon-coupling-driven CDW in AV_{3}Sb_{5} and support an unconventional CDW that was proposed in the kagome lattice at van Hove filling.Haoxiang LiT. T. ZhangT. YilmazY. Y. PaiC. E. MarvinneyA. SaidQ. W. YinC. S. GongZ. J. TuE. VescovoC. S. NelsonR. G. MooreS. MurakamiH. C. LeiH. N. LeeB. J. LawrieH. MiaoAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 11, Iss 3, p 031050 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Haoxiang Li T. T. Zhang T. Yilmaz Y. Y. Pai C. E. Marvinney A. Said Q. W. Yin C. S. Gong Z. J. Tu E. Vescovo C. S. Nelson R. G. Moore S. Murakami H. C. Lei H. N. Lee B. J. Lawrie H. Miao Observation of Unconventional Charge Density Wave without Acoustic Phonon Anomaly in Kagome Superconductors AV_{3}Sb_{5} (A=Rb, Cs)
description	The combination of nontrivial band topology and symmetry-breaking phases gives rise to novel quantum states and phenomena such as topological superconductivity, quantum anomalous Hall effect, and axion electrodynamics. Evidence of intertwined charge density wave (CDW) and superconducting order parameters has recently been observed in a novel kagome material AV_{3}Sb_{5} (A=K, Rb, Cs) that features a Z_{2} topological invariant in the electronic structure. However, the origin of the CDW and its intricate interplay with the topological state has yet to be determined. Here, using hard-x-ray scattering, we demonstrate a three-dimensional CDW with 2×2×2 superstructure in (Rb,Cs)V_{3}Sb_{5}. Unexpectedly, we find that the CDW fails to induce acoustic phonon anomalies at the CDW wave vector but yields a novel Raman mode that quickly damps into a broad continuum below the CDW transition temperature. Our observations exclude strong electron-phonon-coupling-driven CDW in AV_{3}Sb_{5} and support an unconventional CDW that was proposed in the kagome lattice at van Hove filling.
format	article
author	Haoxiang Li T. T. Zhang T. Yilmaz Y. Y. Pai C. E. Marvinney A. Said Q. W. Yin C. S. Gong Z. J. Tu E. Vescovo C. S. Nelson R. G. Moore S. Murakami H. C. Lei H. N. Lee B. J. Lawrie H. Miao
author_facet	Haoxiang Li T. T. Zhang T. Yilmaz Y. Y. Pai C. E. Marvinney A. Said Q. W. Yin C. S. Gong Z. J. Tu E. Vescovo C. S. Nelson R. G. Moore S. Murakami H. C. Lei H. N. Lee B. J. Lawrie H. Miao
author_sort	Haoxiang Li
title	Observation of Unconventional Charge Density Wave without Acoustic Phonon Anomaly in Kagome Superconductors AV_{3}Sb_{5} (A=Rb, Cs)
title_short	Observation of Unconventional Charge Density Wave without Acoustic Phonon Anomaly in Kagome Superconductors AV_{3}Sb_{5} (A=Rb, Cs)
title_full	Observation of Unconventional Charge Density Wave without Acoustic Phonon Anomaly in Kagome Superconductors AV_{3}Sb_{5} (A=Rb, Cs)
title_fullStr	Observation of Unconventional Charge Density Wave without Acoustic Phonon Anomaly in Kagome Superconductors AV_{3}Sb_{5} (A=Rb, Cs)
title_full_unstemmed	Observation of Unconventional Charge Density Wave without Acoustic Phonon Anomaly in Kagome Superconductors AV_{3}Sb_{5} (A=Rb, Cs)
title_sort	observation of unconventional charge density wave without acoustic phonon anomaly in kagome superconductors av_{3}sb_{5} (a=rb, cs)
publisher	American Physical Society
publishDate	2021
url	https://doaj.org/article/4bd26018871e4a9984ac0890d4e775cd
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Observation of Unconventional Charge Density Wave without Acoustic Phonon Anomaly in Kagome Superconductors AV_{3}Sb_{5} (A=Rb, Cs)

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