Low-energy spin dynamics of orthoferrites AFeO3 (A = Y, La, Bi)

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Title
Low-energy spin dynamics of orthoferrites AFeO3 (A = Y, La, Bi)
Author(s)
Kisoo ParK; Hasung Sim; Jonathan C Leiner; Yoshiyuki Yoshida; Jaehong Jeong; Shin-ichiro Yano; Jason Gardner; Philippe Bourges; Milan Klicpera; Vladimír Sechovský; Martin Boehm; Je-Geun Park
Publication Date
2018-06
Journal
Journal of Physics Condensed Matter, v.30, no.23, pp.235802 -
Publisher
IOP PUBLISHING LTD
Abstract
YFeO3 and LaFeO3 are members of the rare-earth orthoferrites family with Pbnm space group. Using inelastic neutron scattering, the low-energy spin excitations have been measured around the magnetic Brillouin zone center. Splitting of magnon branches and finite magnon gaps (∼2 meV) are observed for both compounds, where the Dzyaloshinsky-Moriya interactions account for most of this gap with some additional contribution from single-ion anisotropy. We also make comparisons with multiferroic BiFeO3 (R3c space group), in which similar behavior was observed. By taking into account all relevant local Dzyaloshinsky-Moriya interactions, our analysis allows for the precise determination of all experimentally observed parameters in the spin-Hamiltonian. We find that different properties of the Pbnm and R3c space group lead to the stabilization of a spin cycloid structure in the latter case but not in the former, which explains the difference in the levels of complexity of magnon band structures for the respective compounds. © 2018 IOP Publishing Ltd
URI
https://pr.ibs.re.kr/handle/8788114/4744
ISSN
0953-8984
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
Files in This Item:
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