Nodeless superconductivity in the kagome metal CsV3Sb5

Weiyin Duan, Zhiyong Nie, Shuaishuai Luo, Fanghang Yu, Brenden R. Ortiz, Lichang Yin, Hang Su, Feng Du, An Wang, Ye Chen, Xin Lu, Jianjun Ying, Stephen D. Wilson, Xianhui Chen, Yu Song, Huiqiu Yuan

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121 Scopus citations

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.

Original languageEnglish
Article number107462
JournalScience China: Physics, Mechanics and Astronomy
Volume64
Issue number10
DOIs
StatePublished - Oct 2021
Externally publishedYes

Funding

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.

FundersFunder number
California NanoSystems Institute
Key R&D Program of Zhejiang Province2021C01002
UC Santa Barbara NSFDMR-1906325
National Natural Science Foundation of China12034017, 11974306
National Key Research and Development Program of China2017YFA0303100, 2016YFA0300202

    Keywords

    • 74.20.Rp
    • 74.25.-q
    • 74.25.Bt
    • 74.25.Ha
    • kagome superconductor
    • order parameter
    • penetration depth

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