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

Subhasis Samanta, Hwiwoo Park, Chanhyeon Lee, Sungmin Jeon, Hengbo Cui, Yong-Xin Yao, Jungseek Hwang (), Kwang-Yong Choi () and Heung-Sik Kim ()
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Subhasis Samanta: Kangwon National 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
Jungseek Hwang: Sungkyunkwan University
Kwang-Yong Choi: Sungkyunkwan University
Heung-Sik Kim: Kangwon National University

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-49674-3

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