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

Par Conseil national de recherches du Canada

DOI	Trouver le DOI : https://doi.org/10.1103/PhysRevLett.111.257202
Auteur	Rechercher : Oh, J.; Rechercher : Le, M.D.; Rechercher : Jeong, J.; Rechercher : Lee, J.-H.; Rechercher : Woo, H.; Rechercher : Song, W.-Y.; Rechercher : Perring, T.G.; Rechercher : Buyers, W.J.L.¹; Rechercher : Cheong, S.-W.; Rechercher : Park, J.-G.
Affiliation	Conseil national de recherches du Canada
Format	Texte, Article
Sujet	Heisenberg antiferromagnets; Inelastic neutrons; Linewidth broadening; Magnetic system; Nonlinear effect; Spin hamiltonian; Triangular lattice; Triangular lattice antiferromagnet; Inelastic neutron scattering; Two dimensional
Résumé	The 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.
Date de publication	2013
Dans	Physical Review Letters 111, nº 25, 257202 (2013).
Langue	anglais
Publications évaluées par des pairs	Oui
Numéro NPARC	21270888
Exporter la notice	Exporter en format RIS
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Identificateur de l’enregistrement	4e5473db-caf6-4979-a65a-275217819c73
Enregistrement créé	2014-02-18
Enregistrement modifié	2020-04-22

Date de modification :: 2024-04-25