Giant anomalous Hall effect in quasi-two-dimensional layered antiferromagnet Co${}_{1/3}$NbS${}_2$

Abstract

The discovery of the anomalous Hall effect (AHE) in bulk metallic antiferromagnets (AFMs) motivates the search of the same phenomenon in two-dimensional (2D) systems, where a quantized anomalous Hall conductance can in principle be observed. Here, we present experiments on micro-fabricated devices based on Co${}_{1/3}$NbS${}_2$, a layered AFM that was recently found to exhibit AHE in bulk crystals below the Néel temperature T${}_N$ = 29 K. Transport measurements reveal a pronounced resistivity anisotropy, indicating that upon lowering temperature the electronic coupling between individual atomic layers is increasingly suppressed. The experiments also show an extremely large anomalous Hall conductivity of approximately 400 S/cm, more than one order of magnitude larger than in the bulk, which demonstrates the importance of studying the AHE in small exfoliated crystals, less affected by crystalline defects. Interestingly, the corresponding anomalous Hall conductance, when normalized to the number of contributing atomic planes, is $\sim 0.6e^2/h$ per layer, approaching the value expected for the quantized anomalous Hall effect. The observed strong anisotropy of transport and the very large anomalous Hall conductance per layer make the properties of Co${}_{1/3}$NbS${}_2$ compatible with the presence of partially filled topologically non-trivial 2D bands originating from the magnetic superstructure of the antiferromagnetic state. Isolating atomically thin layers of this material and controlling their charge density may therefore provide a viable route to reveal the occurrence of the quantized AHE in a 2D AFM.

References in corpus (9)

• Scalar spin chirality and quantum Hall effect on a triangular lattice
• Non-collinear Antiferromagnets and the Anomalous Hall Effect
• Cluster multipole theory for anomalous Hall effect in antiferromagnets
• Quantum Theory of Orbital Magnetization and its Generalization to Interacting Systems
• Electrical switching in a magnetically intercalated transition metal dichalcogenide
• Emergent topological phenomena in thin films of pyrochlore iridates
• Chiral domain walls of Mn${}_3$Sn and their memory
• Switching of a large anomalous Hall effect between metamagnetic phases of a non-collinear antiferromagnet
• Anomalous Hall Effect and Spontaneous Orbital Magnetization in Antiferromagnetic Weyl Metal

Cited by in corpus (26)

• Altermagnetism: spin-momentum locked phase protected by non-relativistic symmetries
• Enumeration and representation theory of spin space groups
• Spontaneous topological Hall effect induced by non-coplanar antiferromagnetic order in intercalated van der Waals materials
• Electrically Controllable Crystal Chirality Magneto-Optical Effects in Collinear Antiferromagnets
• Tunable quantum anomalous Hall octet driven by orbital magnetism in bilayer graphene
• Tetrahedral triple-Q magnetic ordering and large spontaneous Hall conductivity in the metallic triangular antiferromagnet Co1/3TaS2
• Symmetry-enforced topological nodal planes at the Fermi surface of a chiral magnet
• Electric Ferro-Axial Moment as Nanometric Rotator and Source of Longitudinal Spin Current
• High-throughput search for magnetic topological materials using spin-orbit spillage, machine-learning and experiments
• Prediction of ferroelectric superconductors with reversible superconducting diode effect
• Large anomalous Hall effect induced by weak ferromagnetism in the noncentrosymmetric antiferromagnet $\mathrm{Co}{\mathrm{Nb}}_3{\mathrm{S}}_6$
• Interplay of altermagnetism and pressure in hexagonal and orthorhombic MnTe
• First-principles study of magnetic states and the anomalous Hall conductivity of $M$Nb${}_3$S${}_6$ ($M$=Co, Fe, Mn, and Ni)
• Visualizing the out-of-plane electronic dispersions in an intercalated transition metal dichalcogenide
• Nonreciprocal Transport in Noncoplanar Magnetic Systems without Spin-Orbit Coupling, Net Scalar Chirality, or Magnetization
• Chiral Dirac fermion in a collinear antiferromagnet
• Generation of modulated magnetic structure based on cluster multipole: Application to $\alpha$-Mn and Co$M_3$S${}_6$
• Electronic transport and magnetism in the alternating stack of metallic and highly frustrated magnetic layers in Co${}_{1/3}$NbS${}_2$
• Gapped nodal planes drive a large topological Nernst effect in a chiral lattice antiferromagnet
• Itinerant A-type Antiferromagnetic Order in Co${}_{0.25}$TaSe${}_2$
• Magnetic and Electronic Switch in Metal Intercalated Two-Dimensional GeP${}_3$
• Coexistence of Commensurate and Incommensurate Antiferromagnetic Groundstates in Co${}_x$NbSe${}_2$ Single Crystal
• Topological magneto-optics in the non-coplanar antiferromagnet Co_{1/3}NbS_2: Imaging and writing chiral magnetic domains
• Correlation-driven origin of shallow electron pocket in Co${}_{1/3}$TaS${}_2$ revealed by ARPES and cluster perturbation theory
• Theoretical design of the large topological magnetoelectric effect in the Co-intercalated NbS${}_2$ structure
• Double-$Q$ chiral stripe order in the anomalous Hall antiferromagnet CoNb${}_3$S${}_6$