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Nodeless superconductivity in the kagome metal CsV3Sb5

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Abstract

The recently discovered kagome metal series AV3Sb5 (A=K, Rb, Cs) exhibits topologically nontrivial band structures, chiral charge order and superconductivity, presenting a unique platform for realizing exotic electronic states. The nature of the superconducting state and the corresponding pairing symmetry are key questions that demand experimental clarification. Here, using a technique based on the tunneling diode oscillator, the magnetic penetration depth Δλ(T) of CsV3Sb5 was measured down to 0.07 K. A clear exponential behavior in Δλ(T) with marked deviations from a T or T2 temperature dependence was observed at low temperatures, indicating an absence of nodal quasiparticles. Temperature dependence of the superfluid density and electronic specific heat can be described by two-gap s-wave superconductivity, consistent with the presence of multiple Fermi surfaces in CsV3Sb5. These results evidence nodeless superconductivity in CsV3Sb5 under ambient pressure, and constrain the allowed pairing symmetry.

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Author information

Authors and Affiliations

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

    Weiyin Duan, Zhiyong Nie, Shuaishuai Luo, Lichang Yin, Hang Su, Feng Du, An Wang, Ye Chen, Xin Lu, Yu Song & Huiqiu Yuan

  2. Zhejiang Province Key Laboratory of Quantum Technology and Device, Department of Physics, Zhejiang University, Hangzhou, 310058, China

    Weiyin Duan, Zhiyong Nie, Shuaishuai Luo, Lichang Yin, Hang Su, Feng Du, An Wang, Ye Chen, Xin Lu, Yu Song & Huiqiu Yuan

  3. Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics, and CAS Key Laboratory of Strongly-coupled Quantum Matter Physics, University of Science and Technology of China, Hefei, 230026, China

    Fanghang Yu, Jianjun Ying & Xianhui Chen

  4. Materials Department and California Nanosystems Institute, University of California Santa Barbara, Santa Barbara, CA, 93106, USA

    Brenden R. Ortiz & Stephen D. Wilson

  5. CAS Center for Excellence in Quantum Information and Quantum Physics, Hefei, 230026, China

    Xianhui Chen

  6. Collaborative Innovation Center of Advanced Microstructures, Nanjing, 210093, China

    Xianhui Chen & Huiqiu Yuan

  7. State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou, 310058, China

    Huiqiu Yuan

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  1. Weiyin Duan
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  2. Zhiyong Nie
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Corresponding authors

Correspondence to Yu Song or Huiqiu Yuan.

Additional information

This work was supported by the National Key R&D Program of China (Grant Nos. 2017YFA0303100, and 2016YFA0300202), Key R&D Program of Zhejiang Province, China (Grant No. 2021C01002), and National Natural Science Foundation of China (Grant Nos. 11974306, and 12034017). S. D. Wilson and B. R. Ortiz gratefully acknowledge support via the UC Santa Barbara NSF Quantum Foundry funded via the Q-AMASE-i Program under award DMR-1906325. B. R. Ortiz also acknowledges support from the California NanoSystems Institute through the Elings Fellowship Program.

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Duan, W., Nie, Z., Luo, S. et al. Nodeless superconductivity in the kagome metal CsV3Sb5. Sci. China Phys. Mech. Astron. 64, 107462 (2021). https://doi.org/10.1007/s11433-021-1747-7

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