Magnon breakdown in a two dimensional triangular lattice heisenberg antiferromagnet of multiferroic LuMnO3

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DOIResolve DOI: http://doi.org/10.1103/PhysRevLett.111.257202
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TypeArticle
Journal titlePhysical Review Letters
ISSN0031-9007
Volume111
Issue25
Article number257202
SubjectHeisenberg antiferromagnets; Inelastic neutrons; Linewidth broadening; Magnetic system; Nonlinear effect; Spin hamiltonian; Triangular lattice; Triangular lattice antiferromagnet; Inelastic neutron scattering; Two dimensional
AbstractThe breakdown of magnons, the quasiparticles of magnetic systems, has rarely been seen. By using an inelastic neutron scattering technique, we report the observation of spontaneous magnon decay in multiferroic LuMnO3, a simple two dimensional Heisenberg triangular lattice antiferromagnet, with large spin S=2. The origin of this rare phenomenon lies in the nonvanishing cubic interaction between magnons in the spin Hamiltonian arising from the noncollinear 120 spin structure. We observed all three key features of the nonlinear effects as theoretically predicted: a rotonlike minimum, a flat mode, and a linewidth broadening, in our inelastic neutron scattering measurements of single crystal LuMnO3. Our results show that quasiparticles in a system hitherto thought of as "classical" can indeed break down. © 2013 American Physical Society.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC)
Peer reviewedYes
NPARC number21270888
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Record identifier4e5473db-caf6-4979-a65a-275217819c73
Record created2014-02-18
Record modified2016-05-09
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