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Emergence of flat bands and ferromagnetic fluctuations via orbital-selective electron correlations in Mn-based kagome metal

Author

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  • Subhasis Samanta

    (Kangwon National University
    Sungkyunkwan University)

  • Hwiwoo Park

    (Sungkyunkwan University)

  • Chanhyeon Lee

    (Chung-Ang University)

  • Sungmin Jeon

    (Sungkyunkwan University)

  • Hengbo Cui

    (Seoul National University)

  • Yong-Xin Yao

    (U.S. Department of Energy
    Iowa State University)

  • Jungseek Hwang

    (Sungkyunkwan University)

  • Kwang-Yong Choi

    (Sungkyunkwan University)

  • Heung-Sik Kim

    (Kangwon National University)

Abstract

Kagome lattice has been actively studied for the possible realization of frustration-induced two-dimensional flat bands and a number of correlation-induced phases. Currently, the search for kagome systems with a nearly dispersionless flat band close to the Fermi level is ongoing. Here, by combining theoretical and experimental tools, we present Sc3Mn3Al7Si5 as a novel realization of correlation-induced almost-flat bands in the kagome lattice in the vicinity of the Fermi level. Our magnetic susceptibility, 27Al nuclear magnetic resonance, transport, and optical conductivity measurements provide signatures of a correlated metallic phase with tantalizing ferromagnetic instability. Our dynamical mean-field calculations suggest that such ferromagnetic instability observed originates from the formation of nearly flat dispersions close to the Fermi level, where electron correlations induce strong orbital-selective renormalization and manifestation of the kagome-frustrated bands. In addition, a significant negative magnetoresistance signal is observed, which can be attributed to the suppression of flat-band-induced ferromagnetic fluctuation, which further supports the formation of flat bands in this compound. These findings broaden a new prospect to harness correlated topological phases via multiorbital correlations in 3d-based kagome systems.

Suggested Citation

  • Subhasis Samanta & Hwiwoo Park & Chanhyeon Lee & Sungmin Jeon & Hengbo Cui & Yong-Xin Yao & Jungseek Hwang & Kwang-Yong Choi & Heung-Sik Kim, 2024. "Emergence of flat bands and ferromagnetic fluctuations via orbital-selective electron correlations in Mn-based kagome metal," Nature Communications, Nature, vol. 15(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-49674-3
    DOI: 10.1038/s41467-024-49674-3
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