Observation of Unconventional Charge Density Wave without Acoustic Phonon Anomaly in Kagome Superconductors A V3Sb5 (A=Rb, Cs)

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

doi:10.1103/PhysRevX.11.031050

Observation of Unconventional Charge Density Wave without Acoustic Phonon Anomaly in Kagome Superconductors A V3Sb5 (A=Rb, Cs)

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

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253 Scopus citations

Abstract

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 AV3Sb5 (A=K, Rb, Cs) that features a Z2 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)V3Sb5. 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 AV3Sb5 and support an unconventional CDW that was proposed in the kagome lattice at van Hove filling.

Original language	English
Article number	031050
Journal	Physical Review X
Volume	11
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevX.11.031050
State	Published - Sep 2021

Funding

We thank J.\u2009G. Cheng, Y.\u2009M. Dai, R. Thomale, Z.\u2009Q. Wang, Z.\u2009Y. Wang, S.\u2009F. Wu, B.\u2009H. Yan, and J.\u2009X. Yin for stimulating discussions. This research is sponsored by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division (ARPES experiment and Raman spectroscopy) and by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory managed by UT-Battelle, LLC, for the U.S. Department of Energy (IXS and XRD experiment). This research uses resources (IXS experiment at beam line 30ID) of the Advanced Photon Source, a U.S. DOE Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. Hard-x-ray diffraction and ARPES measurements use resources at the 4-ID and 21-ID-1 beam lines of the National Synchrotron Light Source II, a U.S. Department of Energy Office of Science User Facility operated for the DOE Office of Science by Brookhaven National Laboratory under Contract No. DE-SC0012704. Extraordinary facility operations are supported in part by the DOE Office of Science through the National Virtual Biotechnology Laboratory, a consortium of DOE national laboratories focused on the response to COVID-19, with funding provided by the Coronavirus CARES Act. Raman spectroscopy is conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. T.\u2009T.\u2009Z. and S.\u2009M. acknowledge support from Tokodai Institute for Element Strategy funded by MEXT Elements Strategy Initiative to Form Core Research Center. T.\u2009T.\u2009Z. and S.\u2009M. also acknowledge the supports from JSPS KAKENHI Grants No. JP18H03678 and No. JP20H04633. T.\u2009Z. also acknowledge the support from JSPS KAKENHI Grants No. JP21K13865. H.\u2009C.\u2009L. acknowledges the support from the National Key R&D Program of China (Grants No. 2016YFA0300504 and No. 2018YFE0202600), the National Natural Science Foundation of China (Grants No. 11774423 and No. 11822412), the Fundamental Research Funds for the Central Universities, and the Research Funds of Renmin University of China (Grants No. 18XNLG14 and No. 19XNLG17). C.\u2009M. is supported by the Intelligence Community Postdoctoral Research Fellowship Program at the Oak Ridge National Laboratory, administered by the Oak Ridge Institute for Science and Education through an interagency agreement between the U.S. Department of Energy and the Office of the Director of National Intelligence. H.\u2009C.\u2009L. is supported by National Natural Science Foundation of China (Grants No. 11822412 and No. 11774423), Ministry of Science and Technology of China (Grants No. 2018YFE0202600 and No. 2016YFA0300504), and Beijing Natural Science Foundation (Grant No. Z200005).

Funders	Funder number
Basic Energy Sciences
Oak Ridge Institute for Science and Education
Division of Materials Sciences and Engineering
Office of the Director of National Intelligence
Laboratory Directed Research and Development Program
Intelligence Community Postdoctoral Research
ARPES experiment
Oak Ridge National Laboratory
U.S. Department of Energy
Ministry of Science and Technology of the People's Republic of China
National Virtual Biotechnology Laboratory
Office of Science
Fundamental Research Funds for the Central Universities
Ministry of Education, Culture, Sports, Science and Technology
Japan Society for the Promotion of Science	JP20H04633, JP18H03678, 21K13865
Japan Society for the Promotion of Science
Argonne National Laboratory	DE-AC02-06CH11357
Argonne National Laboratory
National Natural Science Foundation of China	11774423, 11822412
National Natural Science Foundation of China
Renmin University of China	18XNLG14, 19XNLG17
Renmin University of China
Brookhaven National Laboratory	DE-SC0012704
Brookhaven National Laboratory
National Key Research and Development Program of China	2018YFE0202600, 2016YFA0300504
National Key Research and Development Program of China
Natural Science Foundation of Beijing Municipality	Z200005
Natural Science Foundation of Beijing Municipality

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10.1103/PhysRevX.11.031050

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Li, H., Zhang, T. T., Yilmaz, T., Pai, Y. Y., Marvinney, C. E., Said, A., Yin, Q. W., Gong, C. S., Tu, Z. J., Vescovo, E., Nelson, C. S., Moore, R. G., Murakami, S., Lei, H. C., Lee, H. N., Lawrie, B. J., & Miao, H. (2021). Observation of Unconventional Charge Density Wave without Acoustic Phonon Anomaly in Kagome Superconductors A V3Sb5 (A=Rb, Cs). Physical Review X, 11(3), Article 031050. https://doi.org/10.1103/PhysRevX.11.031050

@article{e47fc9d9b0c24ff7bab28e98091f2881,

title = "Observation of Unconventional Charge Density Wave without Acoustic Phonon Anomaly in Kagome Superconductors A V3Sb5 (A=Rb, Cs)",

abstract = "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 AV3Sb5 (A=K, Rb, Cs) that features a Z2 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)V3Sb5. 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 AV3Sb5 and support an unconventional CDW that was proposed in the kagome lattice at van Hove filling.",

author = "Haoxiang Li and Zhang, {T. T.} and T. Yilmaz and Pai, {Y. Y.} and Marvinney, {C. E.} and A. Said and Yin, {Q. W.} and Gong, {C. S.} and Tu, {Z. J.} and E. Vescovo and Nelson, {C. S.} and Moore, {R. G.} and S. Murakami and Lei, {H. C.} and Lee, {H. N.} and Lawrie, {B. J.} and H. Miao",

note = "Publisher Copyright: {\textcopyright} 2021 authors. Published by the American Physical Society.",

year = "2021",

month = sep,

doi = "10.1103/PhysRevX.11.031050",

language = "English",

volume = "11",

journal = "Physical Review X",

issn = "2160-3308",

publisher = "American Physical Society",

number = "3",

}

Li, H, Zhang, TT, Yilmaz, T, Pai, YY, Marvinney, CE, Said, A, Yin, QW, Gong, CS, Tu, ZJ, Vescovo, E, Nelson, CS, Moore, RG, Murakami, S, Lei, HC, Lee, HN , Lawrie, BJ & Miao, H 2021, 'Observation of Unconventional Charge Density Wave without Acoustic Phonon Anomaly in Kagome Superconductors A V3Sb5 (A=Rb, Cs)', Physical Review X, vol. 11, no. 3, 031050. https://doi.org/10.1103/PhysRevX.11.031050

TY - JOUR

T1 - Observation of Unconventional Charge Density Wave without Acoustic Phonon Anomaly in Kagome Superconductors A V3Sb5 (A=Rb, Cs)

AU - Li, Haoxiang

AU - Zhang, T. T.

AU - Yilmaz, T.

AU - Pai, Y. Y.

AU - Marvinney, C. E.

AU - Said, A.

AU - Yin, Q. W.

AU - Gong, C. S.

AU - Tu, Z. J.

AU - Vescovo, E.

AU - Nelson, C. S.

AU - Moore, R. G.

AU - Murakami, S.

AU - Lei, H. C.

AU - Lee, H. N.

AU - Lawrie, B. J.

AU - Miao, H.

PY - 2021/9

Y1 - 2021/9

N2 - 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 AV3Sb5 (A=K, Rb, Cs) that features a Z2 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)V3Sb5. 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 AV3Sb5 and support an unconventional CDW that was proposed in the kagome lattice at van Hove filling.

AB - 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 AV3Sb5 (A=K, Rb, Cs) that features a Z2 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)V3Sb5. 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 AV3Sb5 and support an unconventional CDW that was proposed in the kagome lattice at van Hove filling.

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SN - 2160-3308

VL - 11

JO - Physical Review X

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IS - 3

M1 - 031050

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Observation of Unconventional Charge Density Wave without Acoustic Phonon Anomaly in Kagome Superconductors A V3Sb5 (A=Rb, Cs)

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