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Kondo screening in a Majorana metal

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Title
Kondo screening in a Majorana metal
Author(s)
Suheon Lee; Choi, Y.S.; Do, S.-H.; Wonjun Lee; Lee, C.H.; Lee, M.; Vojta, M.; Wang, C.N.; Luetkens, H.; Guguchia, Z.; Choi, K.-Y.
Publication Date
2023-11
Journal
Nature Communications, v.14, no.1
Publisher
Nature Publishing Group
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. © 2023, The Author(s).
URI
https://pr.ibs.re.kr/handle/8788114/14662
DOI
10.1038/s41467-023-43185-3
ISSN
2041-1723
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
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