Phys. Rev. Lett. 85, 2601–2604 (2000)Longitudinal Magnetic Excitations in Classical Spin SystemsReceived 4 October 1999; published in the issue dated 18 September 2000 Using spin dynamics simulations we predict the splitting of the longitudinal spin-wave peak in all antiferromagnets with single site anisotropy into two peaks separated by twice the energy gap at the Brillouin zone center. This phenomenon has yet to be observed experimentally but can be easily investigated through neutron scattering experiments on MnF2 and FeF2. We have also determined that for all classical Heisenberg models the longitudinal propagative excitations are entirely multiple spin wave in nature. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.85.2601
DOI:
10.1103/PhysRevLett.85.2601
PACS:
75.30.Ds, 75.10.Hk, 75.40.Mg
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