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Kondo screening in a Majorana metal

Author

Listed:
  • S. Lee

    (Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science)

  • Y. S. Choi

    (Sungkyunkwan University)

  • S.-H. Do

    (Oak Ridge National Laboratory)

  • W. Lee

    (Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science
    Institute for Basic Science)

  • C. H. Lee

    (Chung-Ang University)

  • M. Lee

    (Los Alamos National Laboratory)

  • M. Vojta

    (Technische Universität Dresden)

  • C. N. Wang

    (Paul Scherrer Institute)

  • H. Luetkens

    (Paul Scherrer Institute)

  • Z. Guguchia

    (Paul Scherrer Institute)

  • K.-Y. Choi

    (Sungkyunkwan University)

Abstract

Kondo impurities provide a nontrivial probe to unravel the character of the excitations of a quantum spin liquid. In the S = 1/2 Kitaev model on the honeycomb lattice, Kondo impurities embedded in the spin-liquid host can be screened by itinerant Majorana fermions via gauge-flux binding. Here, we report experimental signatures of metallic-like Kondo screening at intermediate temperatures in the Kitaev honeycomb material α-RuCl3 with dilute Cr3+ (S = 3/2) impurities. The static magnetic susceptibility, the muon Knight shift, and the muon spin-relaxation rate all feature logarithmic divergences, a hallmark of a metallic Kondo effect. Concurrently, the linear coefficient of the magnetic specific heat is large in the same temperature regime, indicating the presence of a host Majorana metal. This observation opens new avenues for exploring uncharted Kondo physics in insulating quantum magnets.

Suggested Citation

  • S. Lee & Y. S. Choi & S.-H. Do & W. Lee & C. H. Lee & M. Lee & M. Vojta & C. N. Wang & H. Luetkens & Z. Guguchia & K.-Y. Choi, 2023. "Kondo screening in a Majorana metal," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-43185-3
    DOI: 10.1038/s41467-023-43185-3
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    References listed on IDEAS

    as
    1. A. Glamazda & P. Lemmens & S. -H. Do & Y. S. Choi & K. -Y. Choi, 2016. "Raman spectroscopic signature of fractionalized excitations in the harmonic-honeycomb iridates β- and γ-Li2IrO3," Nature Communications, Nature, vol. 7(1), pages 1-7, November.
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