Emergent charge order in pressurized kagome superconductor CsV3Sb5

Lixuan Zheng; Zhimian Wu; Ye Yang; Linpeng Nie; Min Shan; Kuanglv Sun; Dianwu Song; Fanghang Yu; Jian Li; Dan Zhao; Shunjiao Li; Baolei Kang; Yanbing Zhou; Kai Liu; Ziji Xiang; Jianjun Ying; Zhenyu Wang; Tao Wu; Xianhui Chen

doi:10.1038/s41586-022-05351-3

Emergent charge order in pressurized kagome superconductor CsV₃Sb₅

Nature. 2022 Nov;611(7937):682-687. doi: 10.1038/s41586-022-05351-3. Epub 2022 Nov 23.

Authors

Lixuan Zheng¹, Zhimian Wu¹, Ye Yang¹, Linpeng Nie¹, Min Shan¹, Kuanglv Sun¹, Dianwu Song¹, Fanghang Yu¹, Jian Li¹, Dan Zhao¹, Shunjiao Li¹, Baolei Kang¹, Yanbing Zhou¹, Kai Liu¹, Ziji Xiang^{1

2}, Jianjun Ying², Zhenyu Wang^{2

3}, Tao Wu^{4

5

6

7

8}, Xianhui Chen^{9

10

11

12

13}

Affiliations

¹ Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, China.
² CAS Key Laboratory of Strongly-coupled Quantum Matter Physics, Department of Physics, University of Science and Technology of China, Hefei, China.
³ CAS Center for Excellence in Superconducting Electronics (CENSE), Shanghai, China.
⁴ Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, China. wutao@ustc.edu.cn.
⁵ CAS Key Laboratory of Strongly-coupled Quantum Matter Physics, Department of Physics, University of Science and Technology of China, Hefei, China. wutao@ustc.edu.cn.
⁶ CAS Center for Excellence in Superconducting Electronics (CENSE), Shanghai, China. wutao@ustc.edu.cn.
⁷ Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, China. wutao@ustc.edu.cn.
⁸ Hefei National Laboratory, University of Science and Technology of China, Hefei, China. wutao@ustc.edu.cn.
⁹ Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, China. chenxh@ustc.edu.cn.
¹⁰ CAS Key Laboratory of Strongly-coupled Quantum Matter Physics, Department of Physics, University of Science and Technology of China, Hefei, China. chenxh@ustc.edu.cn.
¹¹ CAS Center for Excellence in Superconducting Electronics (CENSE), Shanghai, China. chenxh@ustc.edu.cn.
¹² Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, China. chenxh@ustc.edu.cn.
¹³ Hefei National Laboratory, University of Science and Technology of China, Hefei, China. chenxh@ustc.edu.cn.

PMID: 36418450
DOI: 10.1038/s41586-022-05351-3

Abstract

The discovery of several electronic orders in kagome superconductors AV₃Sb₅ (A means K, Rb, Cs) provides a promising platform for exploring unprecedented emergent physics^1-9. Under moderate pressure (<2.2 GPa), the triple-Q charge density wave (CDW) order is monotonically suppressed by pressure, while the superconductivity shows a two-dome-like behaviour, suggesting an unusual interplay between superconductivity and CDW order^10,11. Given that time-reversal symmetry breaking and electronic nematicity have been revealed inside the triple-Q CDW phase^8,9,12,13, understanding this CDW order and its interplay with superconductivity becomes one of the core questions in AV₃Sb₅ (refs. ^3,5,6). Here, we report the evolution of CDW and superconductivity with pressure in CsV₃Sb₅ by ⁵¹V nuclear magnetic resonance measurements. An emergent CDW phase, ascribed to a possible stripe-like CDW order with a unidirectional 4a₀ modulation, is observed between P_c1 ≅ 0.58 GPa and P_c2 ≅ 2.0 GPa, which explains the two-dome-like superconducting behaviour under pressure. Furthermore, the nuclear spin-lattice relaxation measurement reveals evidence for pressure-independent charge fluctuations above the CDW transition temperature and unconventional superconducting pairing above P_c2. Our results not only shed new light on the interplay of superconductivity and CDW, but also reveal new electronic correlation effects in kagome superconductors AV₃Sb₅.

Publication types

Research Support, Non-U.S. Gov't