Spin wave spectrum of the quantum ferromagnet on the pyrochlore lattice Lu2V2O7

Abstract

Neutron inelastic scattering has been used to probe the spin dynamics of the quantum (S=1/2) ferromagnet on the pyrochlore lattice Lu2V2O7. Well-defined spin waves are observed at all energies and wavevectors, allowing us to determine the parameters of the Hamiltonian of the system. The data are found to be in excellent overall agreement with a minimal model that includes a nearest- neighbour Heisenberg exchange J = 8:22(2) meV and a Dzyaloshinskii-Moriya interaction (DMI) D =1:5(1) meV. The large DMI term revealed by our study is broadly consistent with the model developed by Onose et al. to explain the magnon Hall effect they observed in Lu2V2O7 [1], although our ratio of D=J = 0:18(1) is roughly half of their value and three times larger than calculated by ab initio methods [2].

5 pages, 4 figures

References in corpus (3)

• Observation of the Magnon Hall Effect
• Pyrochlore Photons: The U(1) Spin Liquid in a S=1/2 Three-Dimensional Frustrated Magnet
• Topological Magnon Insulator in Insulating Ferromagnet

Cited by in corpus (11)

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• Tunable magnon Weyl points in ferromagnetic pyrochlores
• Magnonic topological insulators in antiferromagnets
• Chiral anomaly of Weyl magnons in stacked honeycomb ferromagnets
• Magnon nodal-line semimetals and drumhead surface states in anisotropic pyrochlore ferromagnets
• Strain and electric-field control of spin-spin interactions in monolayer CrI${}_3$
• Orbital Magnetic Moment of Magnons
• In-plane angular dependence of the spin-wave nonreciprocity of an ultrathin film with Dzyaloshinskii-Moriya interaction
• Disorder-induced broadening of the spin waves in a triangular-lattice quantum-spin-liquid candidate YbZnGaO${}_4$
• Laser control of magnonic topological phases in antiferromagnets
• Thermodynamics of the pyrochlore Heisenberg ferromagnet with arbitrary spin $S$