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Renormalization of spin excitations in hexagonal HoMnO3 by magnon-phonon coupling

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Title
Renormalization of spin excitations in hexagonal HoMnO3 by magnon-phonon coupling
Author(s)
Taehun Kim; Jonathan C. Leiner; Kisoo Park; Joosung Oh; Hasung Sim; Kazuki Iida; Kazuya Kamazawa; Je-Geun Park
Publication Date
2018-05
Journal
PHYSICAL REVIEW B, v.97, no.20, pp.201113(R) -
Publisher
AMER PHYSICAL SOC
Abstract
Hexagonal HoMnO3, a two-dimensional Heisenberg antiferromagnet, has been studied via inelastic neutron scattering. A simple Heisenberg model with a single-ion anisotropy describes most features of the spin-wave dispersion curves. However, there is shown to be a renormalization of the magnon energies located at around 11 meV. Since both the magnon-magnon interaction and magnon-phonon coupling can affect the renormalization in a noncollinear magnet, we have accounted for both of these couplings by using a Heisenberg XXZ model with 1/S expansions [1] and the Einstein site phonon model [13], respectively. This quantitative analysis leads to the conclusion that the renormalization effect primarily originates from the magnon-phonon coupling, while the spontaneous magnon decay due to the magnon-magnon interaction is suppressed by strong two-ion anisotropy. © 2018 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/4519
ISSN
2469-9950
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
Files in This Item:
2018-251_Renormalization of spin-excitations in hexagonal HoMnO3 from magnon-phonon coupling.pdfDownload

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