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Condensed Matter > Strongly Correlated Electrons

arXiv:1606.01954 (cond-mat)
[Submitted on 6 Jun 2016]

Title:Spin-Wave and Electromagnon Dispersions in Multiferroic MnWO4 as Observed by Neutron Spectroscopy: Isotropic Heisenberg Exchange versus Anisotropic Dzyaloshinskii-Moriya Interaction

Authors:Y. Xiao, C. M. N. Kumar, S. Nandi, Y. Su, W. T. Jin, Z. Fu, E. Faulhaber, A. Schneidewind, Th. Brueckel
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Abstract:High resolution inelastic neutron scattering reveals that the elementary magnetic excitations in multiferroic MnWO4 consist of low energy dispersive electromagnons in addition to the well-known spin-wave excitations. The latter can well be modeled by a Heisenberg Hamiltonian with magnetic exchange coupling extending to the 12th nearest neighbor. They exhibit a spin-wave gap of 0.61(1) meV. Two electromagnon branches appear at lower energies of 0.07(1) meV and 0.45(1) meV at the zone center. They reflect the dynamic magnetoelectric coupling and persist in both, the collinear magnetic and paraelectric AF1 phase, and the spin spiral ferroelectric AF2 phase. These excitations are associated with the Dzyaloshinskii-Moriya exchange interaction, which is significant due to the rather large spin-orbit coupling.
Comments: 8 pages, 6 figures, accepted for publication in Physical Review B
Subjects: Strongly Correlated Electrons (cond-mat.str-el); Materials Science (cond-mat.mtrl-sci)
Cite as: arXiv:1606.01954 [cond-mat.str-el]
  (or arXiv:1606.01954v1 [cond-mat.str-el] for this version)
  https://doi.org/10.48550/arXiv.1606.01954
Journal reference: Phys. Rev. B 93, 214428 (2016)
Related DOI: https://doi.org/10.1103/PhysRevB.93.214428

Submission history

From: Yinguo Xiao [view email]
[v1] Mon, 6 Jun 2016 22:00:00 UTC (1,571 KB)
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