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

From National Research Council Canada

DOI	Resolve DOI: https://doi.org/10.1103/PhysRevLett.111.257202
Author	Search for: Oh, J.; Search for: Le, M.D.; Search for: Jeong, J.; Search for: Lee, J.-H.; Search for: Woo, H.; Search for: Song, W.-Y.; Search for: Perring, T.G.; Search for: Buyers, W.J.L.¹; Search for: Cheong, S.-W.; Search for: Park, J.-G.
Affiliation	National Research Council of Canada
Format	Text, Article
Subject	Heisenberg antiferromagnets; Inelastic neutrons; Linewidth broadening; Magnetic system; Nonlinear effect; Spin hamiltonian; Triangular lattice; Triangular lattice antiferromagnet; Inelastic neutron scattering; Two dimensional
Abstract	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.
Publication date	2013
In	Physical Review Letters 111, no. 25, 257202 (2013).
Language	English
Peer reviewed	Yes
NPARC number	21270888
Export citation	Export as RIS
Report a correction	Report a correction (opens in a new tab)
Record identifier	4e5473db-caf6-4979-a65a-275217819c73
Record created	2014-02-18
Record modified	2020-04-22

Date modified:: 2024-04-25