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

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 fou...

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Bibliographic Details
Published in:arXiv.org 2014-05
Main Authors: Mena, M, Perry, R S, Perring, T G, Le, M D, Guerrero, S, Storni, M, Adroja, D T, Ruegg, Ch, McMorrow, D F
Format: Article
Language:English
Subjects:
Ferromagnetism
Hall effect
Inelastic scattering
Magnons
Spin dynamics
Online Access:Get full text
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Summary: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].
ISSN:2331-8422
DOI:10.48550/arxiv.1405.2284