Yong Hu^1,2*, Junzhang Ma^3,4,5, Yinxiang Li⁶, Yuxiao Jiang⁷, Dariusz Jakub Gawryluk⁸, Tianchen Hu⁹, Jérémie Teyssier¹⁰, Volodymyr Multian^10,11, Zhouyi Yin¹², Shuxiang Xu¹³, Soohyeon Shin⁸, Igor Plokhikh⁸, Xinloong Han^14*, Nicholas C. Plumb¹, Yang Liu¹⁵, Jia-Xin Yin¹⁶, Zurab Guguchia¹⁷, Yue Zhao¹², Andreas P. Schnyder¹⁸, Xianxin Wu¹⁹, Ekaterina Pomjakushina⁸, M. Zahid Hasan⁷, Nanlin Wang^9,20,21, Ming Shi^15,1*

1 Photon Science Division, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland

2 Center of Quantum Materials and Devices and Department of Applied Physics, Chongqing University, Chongqing 401331, China

3 Department of Physics, City University of Hong Kong, Kowloon, Hong Kong, China

4 City University of Hong Kong Shenzhen Research Institute, Shenzhen, China

5 Hong Kong Institute for Advanced Study, City University of Hong Kong, Kowloon, Hong Kong, China

6 College of Science, University of Shanghai for Science and Technology, Shanghai 200093, China

7 Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7), Department of Physics, Princeton University, Princeton, NJ, USA

8 Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland

9 International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China

10 Department of Quantum Matter Physics, University of Geneva, 24 Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland

11 Advanced Materials Nonlinear Optical Diagnostics lab, Institute of Physics, NAS of Ukraine, 46 Nauky pr., 03028 Kyiv, Ukraine

12 Institute for Quantum Science and Engineering and Department of Physics, Southern University of Science and Technology of China, Shenzhen, Guangdong 518055, China

13 International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871,

14 Kavli Institute for Theoretical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China

15 Center for Correlated Matter and Department of Physics, Zhejiang University, Hangzhou 310058, China

16 Department of physics, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China

17 Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland

18 Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany

19 CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China

20 Beijing Academy of Quantum Information Sciences, Beijing 100913, China

21 Collaborative Innovation Center of Quantum Matter, Beijing 100871, China

* Corresponding authors emails: yong.hu@psi.ch, xxwu@itp.ac.cn, ming.shi@psi.ch

DOI10.24435/materialscloud:tw-tw [version v1]

Publication date: Mar 03, 2024

How to cite this record

Yong Hu, Junzhang Ma, Yinxiang Li, Yuxiao Jiang, Dariusz Jakub Gawryluk, Tianchen Hu, Jérémie Teyssier, Volodymyr Multian, Zhouyi Yin, Shuxiang Xu, Soohyeon Shin, Igor Plokhikh, Xinloong Han, Nicholas C. Plumb, Yang Liu, Jia-Xin Yin, Zurab Guguchia, Yue Zhao, Andreas P. Schnyder, Xianxin Wu, Ekaterina Pomjakushina, M. Zahid Hasan, Nanlin Wang, Ming Shi, Phonon promoted charge density wave in topological kagome metal ScV₆Sn₆, Materials Cloud Archive 2024.42 (2024), https://doi.org/10.24435/materialscloud:tw-tw

Description

Charge density wave (CDW) orders in vanadium-based kagome metals have recently received tremendous attention, yet their origin remains a topic of debate. The discovery of ScV₆Sn₆, a bilayer kagome metal featuring an intriguing √3 x √3 x 3 CDW order, offers a novel platform to explore the underlying mechanism behind the unconventional CDW. Here, we combine high-resolution angle-resolved photoemission spectroscopy, Raman scattering and density functional theory to investigate the electronic structure and phonon modes of ScV₆Sn₆. We identify topologically nontrivial surface states and multiple van Hove singularities (VHSs) in the vicinity of the Fermi level, with one VHS aligning with the in-plane component of the CDW vector near the K ̅ point. Additionally, Raman measurements indicate a strong electron-phonon coupling, as evidenced by a two-phonon mode and new emergent modes. Our findings highlight the fundamental role of lattice degrees of freedom in promoting the CDW in ScV₆Sn₆.

Materials Cloud sections using this data

Files

File name	Size	Description
Orbital Resolved Band Structure of ScV6Sn6.zip MD5md5:e9916750c133b1eb8902f96d87878624	76.9 KiB	Orbital Resolved Band Structure of ScV6Sn6
resistivity.xlsx MD5md5:b6eeb137b812da28fce54af46d0c480e	124.7 KiB	Ab-plane resistivity of ScV6Sn6
HC.xlsx MD5md5:7b1db9c5daa0fae3d20f6acdd26bf176	16.5 KiB	Specific heat capacity of ScV6Sn6

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External references

Keywords

Kagome metal ScV6Sn6 ARPES, Raman, STM, DFT NCCR MARVEL