Electronic nature of chiral charge order in the kagome superconductor CsV₃Sb₅
Kagome superconductors with TC up to 7 K have been discovered for over 40 y. Recently, unconventional chiral charge order has been reported in kagome superconductor KV3Sb5, with an ordering temperature of one order of magnitude higher than the TC. However, the chirality of the charge order has not b...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
| Published: |
2022
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| Online Access: | https://hdl.handle.net/10356/155564 |
| _version_ | 1811689575813218304 |
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| author | Wang, Zhiwei Jiang, Yu-Xiao Yin, Jia-Xin Li, Yongkai Wang, Guan-Yong Huang, Hai-Li Shao, Sen Liu, Jinjin Zhu, Peng Shumiya, Nana Md Shafayat Hossain Liu, Hongxiong Shi, Youguo Duan, Junxi Li, Xiang Chang, Guoqing Dai, Pengcheng Ye, Zijin Xu, Gang Wang, Yanchao Zheng, Hao Jia, Jinfeng M. Zahid Hasan Yao, Yugui |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Wang, Zhiwei Jiang, Yu-Xiao Yin, Jia-Xin Li, Yongkai Wang, Guan-Yong Huang, Hai-Li Shao, Sen Liu, Jinjin Zhu, Peng Shumiya, Nana Md Shafayat Hossain Liu, Hongxiong Shi, Youguo Duan, Junxi Li, Xiang Chang, Guoqing Dai, Pengcheng Ye, Zijin Xu, Gang Wang, Yanchao Zheng, Hao Jia, Jinfeng M. Zahid Hasan Yao, Yugui |
| author_sort | Wang, Zhiwei |
| collection | NTU |
| description | Kagome superconductors with TC up to 7 K have been discovered for over 40 y. Recently, unconventional chiral charge order has been reported in kagome superconductor KV3Sb5, with an ordering temperature of one order of magnitude higher than the TC. However, the chirality of the charge order has not been reported in the cousin kagome superconductor CsV3Sb5, and the electronic nature of the chirality remains elusive. In this paper, we report the observation of electronic chiral charge order in CsV3Sb5 via scanning tunneling microscopy (STM). We observe a 2 × 2 charge modulation and a 1 × 4 superlattice in both topographic data and tunneling spectroscopy. 2 × 2 charge modulation is highly anticipated as a charge order by fundamental kagome lattice models at van Hove filling, and is shown to exhibit intrinsic chirality. We find that the 1 × 4 superlattices form various small domain walls, and can be a surface effect as supported by our first-principles calculations. Cru- cially, we find that the amplitude of the energy gap opened by the charge order exhibits real-space modulations, and features 2 × 2 wave vectors with chirality, highlighting the electronic nature of the chiral charge order. STM study at 0.4 K reveals a superconducting energy gap with a gap size 2 = 0.85 meV , which estimates a moderate superconductivity coupling strength with 2/kBTC = 3.9. When further applying a c-axis magnetic field, vortex core bound states are observed within this gap, indicative of clean-limit superconductivity. |
| first_indexed | 2024-10-01T05:50:17Z |
| format | Journal Article |
| id | ntu-10356/155564 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:50:17Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1555642023-02-28T19:34:27Z Electronic nature of chiral charge order in the kagome superconductor CsV₃Sb₅ Wang, Zhiwei Jiang, Yu-Xiao Yin, Jia-Xin Li, Yongkai Wang, Guan-Yong Huang, Hai-Li Shao, Sen Liu, Jinjin Zhu, Peng Shumiya, Nana Md Shafayat Hossain Liu, Hongxiong Shi, Youguo Duan, Junxi Li, Xiang Chang, Guoqing Dai, Pengcheng Ye, Zijin Xu, Gang Wang, Yanchao Zheng, Hao Jia, Jinfeng M. Zahid Hasan Yao, Yugui School of Physical and Mathematical Sciences Science::Physics Kagome Superconductor Topological Materials Kagome superconductors with TC up to 7 K have been discovered for over 40 y. Recently, unconventional chiral charge order has been reported in kagome superconductor KV3Sb5, with an ordering temperature of one order of magnitude higher than the TC. However, the chirality of the charge order has not been reported in the cousin kagome superconductor CsV3Sb5, and the electronic nature of the chirality remains elusive. In this paper, we report the observation of electronic chiral charge order in CsV3Sb5 via scanning tunneling microscopy (STM). We observe a 2 × 2 charge modulation and a 1 × 4 superlattice in both topographic data and tunneling spectroscopy. 2 × 2 charge modulation is highly anticipated as a charge order by fundamental kagome lattice models at van Hove filling, and is shown to exhibit intrinsic chirality. We find that the 1 × 4 superlattices form various small domain walls, and can be a surface effect as supported by our first-principles calculations. Cru- cially, we find that the amplitude of the energy gap opened by the charge order exhibits real-space modulations, and features 2 × 2 wave vectors with chirality, highlighting the electronic nature of the chiral charge order. STM study at 0.4 K reveals a superconducting energy gap with a gap size 2 = 0.85 meV , which estimates a moderate superconductivity coupling strength with 2/kBTC = 3.9. When further applying a c-axis magnetic field, vortex core bound states are observed within this gap, indicative of clean-limit superconductivity. Nanyang Technological University National Research Foundation (NRF) Accepted version The work at Beijing Institute of Technology was sup- ported by the National Key R&D Program of China (Grant No. 2020YFA0308800), the Natural Science Foun- dation of China (Grants No. 92065109, No. 11734003, and No. 12061131002), the Beijing Natural Science Foundation (Grant No. Z190006), and the Beijing Institute of Technology (BIT) Research Fund Program for Young Scholars (Grant No. 3180012222011). Z.W. thanks the Analysis & Testing Center at BIT for assistance in facility support. Experimental and theoretical work at Princeton University was supported by the Gordon and Betty Moore Foundation [Grants No. GBMF4547 and No. GBMF9461 (M.Z.H.)]. Y.S. was supported by the National Natural Science Foundation of China (Grant No. U2032204), and the K. C. Wong Education Foundation (Grant No. GJTD-2018-01). G.C. would like to acknowledge the support of the National Research Foundation, Singapore under its NRF Fellowship Award No. NRF-NRFF13-2021- 0010 and the Nanyang Assistant Professorship grant from Nanyang Technological University. P.D. is supported the U.S. Department of Energy (DOE), Basic Energy Sciences (BES), under Contract No. DE-SC0012311. S.S. and Y.W. were supported by the National Natural Science Foundation of China under Grants No. 11822404 and No. 11774127. 2022-03-07T01:04:51Z 2022-03-07T01:04:51Z 2021 Journal Article Wang, Z., Jiang, Y., Yin, J., Li, Y., Wang, G., Huang, H., Shao, S., Liu, J., Zhu, P., Shumiya, N., Md Shafayat Hossain, Liu, H., Shi, Y., Duan, J., Li, X., Chang, G., Dai, P., Ye, Z., Xu, G., ...Yao, Y. (2021). Electronic nature of chiral charge order in the kagome superconductor CsV₃Sb₅. Physical Review B, 104(7), 075148-. https://dx.doi.org/10.1103/PhysRevB.104.075148 2469-9950 https://hdl.handle.net/10356/155564 10.1103/PhysRevB.104.075148 7 104 075148 en 020375-00001 NRF-NRFF13-2021-0010 Physical Review B © 2021 American Physical Society. All rights reserved. This paper was published in Physical Review B and is made available with permission of American Physical Society. application/pdf |
| spellingShingle | Science::Physics Kagome Superconductor Topological Materials Wang, Zhiwei Jiang, Yu-Xiao Yin, Jia-Xin Li, Yongkai Wang, Guan-Yong Huang, Hai-Li Shao, Sen Liu, Jinjin Zhu, Peng Shumiya, Nana Md Shafayat Hossain Liu, Hongxiong Shi, Youguo Duan, Junxi Li, Xiang Chang, Guoqing Dai, Pengcheng Ye, Zijin Xu, Gang Wang, Yanchao Zheng, Hao Jia, Jinfeng M. Zahid Hasan Yao, Yugui Electronic nature of chiral charge order in the kagome superconductor CsV₃Sb₅ |
| title | Electronic nature of chiral charge order in the kagome superconductor CsV₃Sb₅ |
| title_full | Electronic nature of chiral charge order in the kagome superconductor CsV₃Sb₅ |
| title_fullStr | Electronic nature of chiral charge order in the kagome superconductor CsV₃Sb₅ |
| title_full_unstemmed | Electronic nature of chiral charge order in the kagome superconductor CsV₃Sb₅ |
| title_short | Electronic nature of chiral charge order in the kagome superconductor CsV₃Sb₅ |
| title_sort | electronic nature of chiral charge order in the kagome superconductor csv₃sb₅ |
| topic | Science::Physics Kagome Superconductor Topological Materials |
| url | https://hdl.handle.net/10356/155564 |
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