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강상관계 물질 연구단
강상관계 물질 연구단
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Magnetic excitations in the bulk multiferroic two-dimensional triangular lattice antiferromagnet (Lu,Sc)FeO3

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Title
Magnetic excitations in the bulk multiferroic two-dimensional triangular lattice antiferromagnet (Lu,Sc)FeO3
Author(s)
Jonathan C. Leiner; Taehun Kim; Kisoo Park; Joosung Oh; Perring T.G.; Walker H.C.; Xu X.; Wang Y.; Cheong S.-W.; Je-Geun Park
Publication Date
2018-10
Journal
PHYSICAL REVIEW B, v.98, no.13, pp.134412 -
Publisher
AMER PHYSICAL SOC
Abstract
Noncollinear two-dimensional triangular lattice antiferromagnets (2D TLAFs) are currently an area of very active research due to their unique magnetic properties, which lead to nontrivial quantum effects that experimentally manifest themselves in the spin excitation spectra. Recent examples of such insulating 2D TLAFs include (Y,Lu)MnO3, LiCrO2, and CuCrO2. Hexagonal LuFeO3 is a recently synthesized 2D TLAF which exhibits properties of an ideal multiferroic material, partially because of the high spin (S=5/2) and strong magnetic superexchange interactions. We report the full range of spin dynamics in a bulk single crystal of (Lu0.6Sc0.4)FeO3 (Sc doping to stabilize the hexagonal structure) measured via time-of-flight inelastic neutron scattering. Modeling with linear spin-wave theory yields a nearest-neighbor exchange coupling of J=4.0(2)meV (density functional theory calculations for h-LuFeO3 predicted a value of 6.31 meV) and anisotropy values of KD=0.17(1)meV (easy plane) and KA=-0.05(1)meV (local easy axis). It is observed that the magnon bandwidth of the spin-wave spectra is twice as large for h-(Lu,Sc)FeO3 as it is for h-LuMnO3. ©2018 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/5136
ISSN
2469-9950
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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2018-258_Magnetic excitations in the bulk multiferroic two-dimensional triangular lattice antiferromagnet (Lu,Sc)FeO3.pdfDownload

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