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Bond-dependent anisotropy and magnon decay in cobalt-based Kitaev triangular antiferromagnet
Following tremendous success of the graphene-derived fundamental and applied research, the magnetic van der Waals materials that can be cleaved into monolayer two-dimensional atomic crystals have emerged as a new platform in the studies of low-dimensional physics and in the design of artificial heterostructures with novel properties. Because of that, the family of dihalides and trihalides of the 3d transition group receive a strong renewed interest. Together with our experimental collaborators, we have investigated the novel dynamical properties of one of such promising material CoI 2 , and demonstrated that spin excitations in it are prone to substantial breakdown and complex level repulsion, the important quantum effects whose theoretical understanding has been significantly advanced by our group in the last two decades. Both phenomena are dramatically revealed by experiments and verified by the theory in our joint study, published in Nature Physics. Altogether, our results pave the way toward a new research direction for the magnetic van der Waals materials.
Proximate spin liquid and fractionalization in the triangular antiferromagnet KYbSe 2
The Heisenberg triangular-lattice quantum spin liquid and its phase transitions to nearby magnetic orders have received much theoretical attention, but clear experimental manifestations of these states are rare. Here we demonstrate that a spin-half delafossite material, namely, KYbSe 2 , shows close proximity to the triangular-lattice Heisenberg quantum spin liquid. Using neutron scattering, we identify a diffuse continuum with a sharp lower bound within the measured spectra. Applying entanglement witnesses to the data indicates multipartite entanglement spread between its neighbours, and an analysis of its magnetic-exchange couplings reveals close proximity to the theoretical quantum spin-liquid phase. The key features of the data are reproduced by Schwinger boson theory and tensor network calculations with a substantial next-nearest-neighbour coupling. The strength of the dynamical structure factor at the Brillouin-zone K point shows a scaling collapse down to 0.3 K, indicating the existence of a second-order quantum phase transition. Finally, comparing this with previous theoretical work suggests that the proximate phase at a larger next-nearest-neighbour coupling is a gapped $\mathbb{Z}_{2}$ spin liquid, resolving a long-debated issue. Similar content being viewed by others
Spin current from sub-terahertz-generated antiferromagnetic magnons
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Perpendicular full switching of chiral antiferromagnetic order by current
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Exfoliation and optical properties of S = 1 triangular lattice antiferromagnet NiGa2S4
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Giant exchange splitting in the electronic structure of A-type 2D antiferromagnet CrSBr
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Electrical switching of the topological anomalous Hall effect in a non-collinear antiferromagnet above room temperature
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Large exchange splitting in monolayer graphene magnetized by an antiferromagnet
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Unexpected band structure changes within the higher-temperature antiferromagnetic state of CeBi
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Antiferromagnetic ordering through a hydrogen-bonded network in the molecular solid CuF{sub 2}(H{sub 2}O){sub 2}(3-chloropyridien).
Abstract not provided
Organizing a bis(iminoylnitroxide) diradical into antiferromagnetically coupled chains by co-crystallization with dichloromethane
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SrCu₃V₂O₈(OH)₂ - dynamic Jahn-Teller distortions and orbital frustration in a new S=½ kagome antiferromagnet
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Order–disorder transition in the S = ½ kagome antiferromagnets claringbullite and barlowite
STEM study of Cu kagome lattice in claringbullite.
Diffusion doping of cobalt in rod-shape anatase TiO 2 nanocrystals leads to antiferromagnetism
Cobalt( ii ) ions were adsorbed to the surface of rod-shape anatase TiO 2 nanocrystals and subsequently heated to promote ion diffusion into the nanocrystal.