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

Samanta, Subhasis; Park, Hwiwoo; Lee, Chanhyeon; Jeon, Sungmin; Cui, Hengbo; Yao, Yong-Xin; Hwang, Jungseek; Choi, Kwang-Yong; Kim, Heung-Sik

doi:10.1038/s41467-024-49674-3

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

Journal Article · Tue Jun 25 00:00:00 EDT 2024 · Nature Communications

DOI:https://doi.org/10.1038/s41467-024-49674-3· OSTI ID:2382773

^[1]; Park, Hwiwoo ^[2]; Lee, Chanhyeon ^[3]; Jeon, Sungmin ^[2]; Cui, Hengbo ^[4]; ^[5]; ^[2]; ^[2]; ^[6]

Kangwon National Univ., Chuncheon (Korea, Republic of); Sungkyunkwan Univ., Suwon (Republic of Korea)
Sungkyunkwan Univ., Suwon (Republic of Korea)
Chung-Ang Univ., Seoul (Korea, Republic of)
Seoul National Univ. (Korea, Republic of)
Ames Lab., and Iowa State Univ., Ames, IA (United States)
Kangwon National Univ., Chuncheon (Korea, Republic of)

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.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: National Research Foundation of Korea (NRF); National Supercomputing Center of Korea; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 2382773

Report Number(s):: IS-J--11,373

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 15; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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