Unusual exchange couplings and intermediate temperature Weyl state in Co3Sn2S2

Abstract

Understanding the magnetism and its possible correlations to the topological properties has emerged as a forefront and difficult topic in studying magnetic Weyl semimetals. Co${}_3$Sn${}_2$S${}_2$ is a newly discovered magnetic Weyl semimetal with a kagome lattice of cobalt ions and has triggered intense interest for rich fantastic phenomena. Here, we report the magnetic exchange couplings of Co${}_3$Sn${}_2$S${}_2$ using inelastic neutron scattering and two density functional theory (DFT) based methods: constrained magnetism and multiple-scattering Green's function methods. Co${}_3$Sn${}_2$S${}_2$ exhibits highly anisotropic magnon dispersions and linewidths below $T_C$, and paramagnetic excitations above $T_C$. The spin-wave spectra in the ferromagnetic ground state is well described by the dominant third-neighbor "across-hexagon" $J_d$ model. Our density functional theory calculations reveal that both the symmetry-allowed 120${}^{\circ }$ antiferromagnetic orders support Weyl points in the intermediate temperature region, with distinct numbers and the locations of Weyl points. Our study highlights the important role Co${}_3$Sn${}_2$S${}_2$ can play in advancing our understanding of kagome physics and exploring the interplay between magnetism and band topology.

arXiv comment5 pages, 4 figures, plus one supplementary material

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• Chiral and flat-band magnetic cluster excitations in a ferromagnetic kagome metal
• Kagome metals
• Spin structure and dynamics of the topological semimetal Co${}_3$Sn${}_{2-x}$In${}_x$S${}_2$
• Microscopic origins and stability of the ferromagnetism in Co${}_3$Sn${}_2$S${}_2$
• Tuning quantum transport by controlling spin reorientations in Dirac semimetal candidates Eu${}_{1-x}$Sr${}_x$MnSb${}_2$
• Anomalous depinning of magnetic domain walls within the ferromagnetic phase of the Weyl semimetal Co3Sn2S2
• Linear response theories for interatomic exchange interactions
• Unravelling the origin of the peculiar transition in the magnetically ordered phase of the Weyl semimetal Co3Sn2S2
• Self-consistent Analysis of Doping Effect for Magnetic Ordering in Stacked-Kagome Weyl System
• Magnetoresistance signature of two-dimensional electronic states in Co${}_3$Sn${}_2$S${}_2$
• Spin waves and orbital contribution to ferromagnetism in a topological metal
• Magnetic domain depinning as possible evidence for two ferromagnetic phases in LaCrGe${}_3$
• Effective model analysis of intrinsic spin Hall effect with magnetism in stacked-kagome Weyl semimetal Co3Sn2S2
• Field Orientation Dependent Magnetic Phases In Weyl Semimetal Co3Sn2S2
• On the Onsager-Casimir reciprocal relations in a tilted Weyl semimetal
• Topological Signatures in Nodal Semimetals through Neutron Scattering
• Discovery of terahertz-frequency orbitally-coupled magnons in a kagome ferromagnet
• Magnetic memory and distinct spin populations in ferromagnetic Co3Sn2S2
• Tunable Anomalous Hall Effect in a Kagome Ferromagnetic Weyl Semimetal
• NMR study of the local magnetic order in the kagome Weyl semimetal Co${}_3$Sn${}_2$S${}_2$
• In-plane Antiferromagnetism in Ferromagnetic Kagome Semimetal Co3Sn2S2