Magnon-phonon coupling and two-magnon continuum in the two-dimensional triangular antiferromagnet CuCrO2

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Title
Magnon-phonon coupling and two-magnon continuum in the two-dimensional triangular antiferromagnet CuCrO2
Author(s)
Kisoo Park; Joosung Oh; Jonathan C. Leiner; Jaehong Jeong; Rule K.C.; Manh Duc Le; Je-Geun Park
Publication Date
2016-09
Journal
PHYSICAL REVIEW B, v.94, no.10, pp.104421 -
Publisher
AMER PHYSICAL SOC
Abstract
CuCrO2 is a manifestation of a two-dimensional triangular antiferromagnet which exhibits an incommensurate noncollinear magnetic structure similar to a classical 120 ordering. Using the inelastic neutron scattering technique, direct evidence of a magnon-phonon coupling in CuCrO2 is revealed via the mixed magnon-phonon character of the excitation mode at 12.5 meV as well as a minimum at the zone boundary. A simple model Hamiltonian that incorporates an exchange-striction type magnon-phonon coupling accurately reproduces the observed features. Also, continuum excitations originating from the interaction between quasiparticles are observed with strong intensity at the zone boundary. These features of the magnetic excitations are key to an understanding of the emergent excitations in noncollinear antiferromagnetic compounds. © 2016 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/3051
ISSN
2469-9950
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
Files in This Item:
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