Three-dimensional nature of anomalous Hall conductivity in YMn6Sn6−xGax, x ≈ 0.55

The unique geometry of kagome lattices leads to topological features such as flat bands and Dirac cones. When paired with ferromagnetism and a Fermi level near Dirac points, they offer a platform for realizing topological Chern magnetotransport. This prospect recently drew interest in the ferrimagnetic kagome metal TbMn6Sn6. However, density functional theory (DFT) calculations indicate that its 2D Chern gap lies well above the Fermi energy, raising questions about its role in anomalous Hall conductivity. Here, we study YMn6Sn5.45Ga0.55, a structurally and electronically similar material, and find that its intrinsic anomalous Hall effect is three-dimensional. This demonstrates that the Hall response in such compounds does not originate from 2D Chern gaps. Additionally, we confirm that the newly proposed empirical scaling relation for extrinsic Hall conductivity is universally governed by spin fluctuations.

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Publication Details

Journal
npj Quantum Materials
Published
2025-09-26
DOI
https://doi.org/10.1038/s41535-025-00816-w
Citations
1
Primary Topic
Rare-earth and actinide compounds
Type
article
Field-Weighted Citation Impact
1.26

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article

Three-dimensional nature of anomalous Hall conductivity in YMn6Sn6−xGax, x ≈ 0.55

Peter Siegfried, I. I. Mazin, A. Oliver, Po-Hao Chang et al.
1 citations
npj Quantum Materials
Rare-earth and actinide compounds
1.26
article

Three-dimensional nature of anomalous Hall conductivity in YMn6Sn6−xGax, x ≈ 0.55

Peter Siegfried, I. I. Mazin, A. Oliver, Po-Hao Chang, Hari Bhandari, Zhenhua Ning, Resham Babu Regmi, N. Ghimire, Liqin Ke, Albert V. Davydov, Mohamed El Gazzah
article en
1 citations

Abstract

The unique geometry of kagome lattices leads to topological features such as flat bands and Dirac cones. When paired with ferromagnetism and a Fermi level near Dirac points, they offer a platform for realizing topological Chern magnetotransport. This prospect recently drew interest in the ferrimagnetic kagome metal TbMn6Sn6. However, density functional theory (DFT) calculations indicate that its 2D Chern gap lies well above the Fermi energy, raising questions about its role in anomalous Hall conductivity. Here, we study YMn6Sn5.45Ga0.55, a structurally and electronically similar material, and find that its intrinsic anomalous Hall effect is three-dimensional. This demonstrates that the Hall response in such compounds does not originate from 2D Chern gaps. Additionally, we confirm that the newly proposed empirical scaling relation for extrinsic Hall conductivity is universally governed by spin fluctuations.

npj Quantum MaterialsVol. 10(1)
University of Notre Dame (US), National Institute of Standards and Technology (US), George Mason University (US), Ames National Laboratory (US), University of Virginia (US)
National Science Foundation, U.S. Department of Energy, Iowa State University, National Institute of Standards and Technology, Division of Materials Research, Basic Energy Sciences, Division of Materials Sciences and Engineering
Openalex Percentile: Top 17%
Rare-earth and actinide compounds
1.26
DOIOpen Access PDFOpenAlex
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