Three-dimensional nature 1 of anomalous Hall conductivity in YMn6Sn6−xGax, x ≈ 0.55

Published

November 19, 2024

Author(s)

Albert Davydov, Hari "Bhandari ", Zhenhua Ning, Po-Hao Chang, Peter Siegfried, Resham Regmi, Mohamed El Gazzah, Allen Oliver, Liqin Ke, Igor Mazin, Nirmal Ghimire

Abstract

The unique connectivity of kagome lattices gives rise to topological properties such as flat bands and Dirac cones. When combined with ferromagnetism and with the chemical potential near the 2D Dirac points, this structure offers potential for realizing the highly sought-after topological Chern magnetotransport. Recently, there was considerable excitement around this possibility in the ferrimagnetic kagome metal TbMn6Sn6. However, density functional theory (DFT) calculations show that the 2D Chern gap lies well above the Fermi energy, challenging its relevance in the observed anomalous Hall conductivity. Here, we investigate YMn6Sn5.45Ga0.55, a compound with similar crystallographic, magnetic, and electronic properties to TbMn6Sn6. Our findings show that the anomalous Hall conductivity in this material while comparable in magnitude with that in TbMn6Sn6, is fully three-dimensional, thus providing experimental evidence that Hall conductivity in this class of materials does not originate from 2D Chern gaps. Additionally, we confirm that newly proposed empirical scaling relation for the extrinsic Hall conductivity is universally determined by spin fluctuations.

Citation

npj Quantum Materials

Pub Type

Journals

Keywords

ferromagnetism, anomalous Hall effect, magnetotransport, kagome lattice

Citation

Davydov, A. , "Bhandari ", H. , Ning, Z. , Chang, P. , Siegfried, P. , Regmi, R. , El Gazzah, M. , Oliver, A. , Ke, L. , Mazin, I. and Ghimire, N. (2024), Three-dimensional nature 1 of anomalous Hall conductivity in YMn6Sn6−xGax, x ≈ 0.55, npj Quantum Materials (Accessed January 17, 2025)