Magnon Breakdown in a Two Dimensional Triangular Lattice Heisenberg Antiferromagnet of Multiferroic LuMnO3

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Title
Magnon Breakdown in a Two Dimensional Triangular Lattice Heisenberg Antiferromagnet of Multiferroic LuMnO3
Author(s)
Joosung Oh; Manh Duc Le; Jaehong Jeong; Lee, JH (Lee, Jung-hyun); Woo, H (Woo, Hyungje); Song, WY (Song, Wan-Young); Perring, TG (Perring, T. G.); Buyers, WJL (Buyers, W. J. L.; Cheong, SW (Cheong, S. -W.); Je Geun Park
Publication Date
2013-12
Journal
PHYSICAL REVIEW LETTERS, v.111, no.25, pp.257202 -
Publisher
AMER PHYSICAL SOC
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 degrees 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. (c) 2013 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/1192
ISSN
0031-9007
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
Files in This Item:
PhysicalReviewLetters_111_257202_2013.pdfDownload

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