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 Lu(2)V(2)O(7). Well-defined spin waves are observed at all energies and wave vectors, allowing us to determine the parameters of the Hamiltonian of the system. The data...

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Bibliographic Details
Published in:Physical review letters 2014-07, Vol.113 (4), p.047202-047202
Main Authors: Mena, M, Perry, R S, Perring, T G, Le, M D, Guerrero, S, Storni, M, Adroja, D T, Rüegg, Ch, McMorrow, D F
Format: Article
Language:English
Subjects:
Dynamical systems
Exchange
Ferromagnetism
Inelastic scattering
Lattices
Pyrochlores
Spin dynamics
Spin waves
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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 Lu(2)V(2)O(7). Well-defined spin waves are observed at all energies and wave vectors, 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-neighbor 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 originally used to explain the magnon Hall effect in this compound [Onose et al., Science 329, 297 (2010) and Ideue et al., Phys. Rev. B 85, 134411 (2012)]. However, our ratio of D/J = 0.18(1) is roughly half of their value, and is much larger than those found in other theoretical studies [Xiang et al., Phys. Rev. B 83, 174402 (2011) and Mook et al., Phys. Rev. B 89,134409 (2014)].
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.113.047202