Charge-density-wave-driven electronic nematicity in a kagome superconductor - Nature.com

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Abstract

Electronic nematicity, in which rotational symmetry is spontaneously broken by electronic degree of freedom, has been demonstrated as a ubiquitous phenomenon in correlated quantum fluids including high-temperature superconductors (HTS) and quantum Hall systems^1,2. More strikingly, the electronic nematicity in HTS exhibits an intriguing entanglement with superconductivity, generating complicated superconducting pairing and intertwined electronic orders. Recently, an unusual competition between superconductivity and a charge-density-wave (CDW) order has been found in AV₃Sb₅ (A = K, Rb, Cs) family with two-dimensional vanadium kagome nets^3–8. Whether these phenomena involve electronic nematicity is still elusive. Here, we report compelling evidence for the existence of electronic nematicity in CsV₃Sb₅, using a combination of elastoresistance measurements, nuclear magnetic resonance (NMR) and scanning tunnelling microscopy/spectroscopy (STM/S). The temperature-dependent elastoresistance coefficient (m₁₁-m₁₂) and NMR spectrum clearly demonstrate that, besides a C₂ structural distortion of 2a₀×2a₀ supercell due to out-of-plane modulation, significant nematic fluctuations emerge immediately below the CDW transition (T_CDW ~ 94 K) and finally a nematic transition occurs below T_nem ~ 35 K. STM experiment directly visualizes the C₂-structure-pinned long-range nematic order below T_nem, suggesting a novel nematicity described by a three-state Potts model. Our findings unambiguously prove an intrinsic electronic nematicity in the normal state of CsV₃Sb₅, which sets a new paradigm for revealing the role of electronic nematicity on pairing mechanism in unconventional superconductors.

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Author information

Author notes

1. These authors contributed equally to this work: Linpeng Nie, Kuanglv Sun, Wanru Ma

Affiliations

1. Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui, China

   Linpeng Nie, Kuanglv Sun, Dianwu Song, Lixuan Zheng, Zuowei Liang, Fanghang Yu, Jian Li, Min Shan, Dan Zhao, Shunjiao Li, Baolei Kang, Zhimian Wu, Yanbing Zhou, Kai Liu, Ziji Xiang, Tao Wu & Xianhui Chen

2. CAS Key Laboratory of Strongly-coupled Quantum Matter Physics, Department of Physics, University of Science and Technology of China, Hefei, Anhui, China

   Wanru Ma, Ping Wu, Jianjun Ying, Zhenyu Wang, Tao Wu & Xianhui Chen

3. CAS Center for Excellence in Superconducting Electronics (CENSE), Shanghai, China

   Zhenyu Wang, Tao Wu & Xianhui Chen

4. Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, China

   Tao Wu & Xianhui Chen

5. CAS Center for Excellence in Quantum Information and Quantum Physics, Hefei, Anhui, China

   Xianhui Chen

Authors

1. Linpeng Nie
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2. Kuanglv Sun
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3. Wanru Ma
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4. Dianwu Song
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5. Lixuan Zheng
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6. Zuowei Liang
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7. Ping Wu
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8. Fanghang Yu
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9. Jian Li
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10. Min Shan
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11. Dan Zhao
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12. Shunjiao Li
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13. Baolei Kang
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14. Zhimian Wu
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15. Yanbing Zhou
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16. Kai Liu
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17. Ziji Xiang
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18. Jianjun Ying
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19. Zhenyu Wang
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20. Tao Wu
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21. Xianhui Chen
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Corresponding authors

Correspondence to Zhenyu Wang, Tao Wu or Xianhui Chen.

Supplementary information

Supplementary Information

This file contains Supplementary Sections 1–16, including 18 Supplementary Figures, Supplementary Tables 1–2 and Supplementary References – see Contents page for details.

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Nie, L., Sun, K., Ma, W. et al. Charge-density-wave-driven electronic nematicity in a kagome superconductor. Nature (2022). https://ift.tt/kpgf17D

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• Received: 02 September 2021

• Accepted: 26 January 2022

• Published: 09 February 2022

• DOI: https://ift.tt/kpgf17D

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