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Tunable unconventional kagome superconductivity in charge ordered RbV3Sb5 and KV3Sb5

Author

Listed:
  • Z. Guguchia

    (Paul Scherrer Institute)

  • C. Mielke

    (Paul Scherrer Institute)

  • D. Das

    (Paul Scherrer Institute)

  • R. Gupta

    (Paul Scherrer Institute)

  • J.-X. Yin

    (Southern University of Science and Technology)

  • H. Liu

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Q. Yin

    (Renmin University of China)

  • M. H. Christensen

    (University of Copenhagen)

  • Z. Tu

    (Renmin University of China)

  • C. Gong

    (Renmin University of China)

  • N. Shumiya

    (Princeton University)

  • Md Shafayat Hossain

    (Princeton University)

  • Ts. Gamsakhurdashvili

    (Paul Scherrer Institute)

  • M. Elender

    (Paul Scherrer Institute)

  • Pengcheng Dai

    (Rice University)

  • A. Amato

    (Paul Scherrer Institute)

  • Y. Shi

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • H. C. Lei

    (Renmin University of China)

  • R. M. Fernandes

    (University of Minnesota)

  • M. Z. Hasan

    (Princeton University
    Princeton University
    Lawrence Berkeley National Laboratory
    Oak Ridge)

  • H. Luetkens

    (Paul Scherrer Institute)

  • R. Khasanov

    (Paul Scherrer Institute)

Abstract

Unconventional superconductors often feature competing orders, small superfluid density, and nodal electronic pairing. While unusual superconductivity has been proposed in the kagome metals AV3Sb5, key spectroscopic evidence has remained elusive. Here we utilize pressure-tuned and ultra-low temperature muon spin spectroscopy to uncover the unconventional nature of superconductivity in RbV3Sb5 and KV3Sb5. At ambient pressure, we observed time-reversal symmetry breaking charge order below $${T}_{{{{{{{{\rm{1}}}}}}}}}^{*}\simeq$$ T 1 * ≃ 110 K in RbV3Sb5 with an additional transition at $${T}_{{{{{{{{\rm{2}}}}}}}}}^{*}\simeq$$ T 2 * ≃ 50 K. Remarkably, the superconducting state displays a nodal energy gap and a reduced superfluid density, which can be attributed to the competition with the charge order. Upon applying pressure, the charge-order transitions are suppressed, the superfluid density increases, and the superconducting state progressively evolves from nodal to nodeless. Once optimal superconductivity is achieved, we find a superconducting pairing state that is not only fully gapped, but also spontaneously breaks time-reversal symmetry. Our results point to unprecedented tunable nodal kagome superconductivity competing with time-reversal symmetry-breaking charge order and offer unique insights into the nature of the pairing state.

Suggested Citation

  • Z. Guguchia & C. Mielke & D. Das & R. Gupta & J.-X. Yin & H. Liu & Q. Yin & M. H. Christensen & Z. Tu & C. Gong & N. Shumiya & Md Shafayat Hossain & Ts. Gamsakhurdashvili & M. Elender & Pengcheng Dai , 2023. "Tunable unconventional kagome superconductivity in charge ordered RbV3Sb5 and KV3Sb5," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-022-35718-z
    DOI: 10.1038/s41467-022-35718-z
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    References listed on IDEAS

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