Anomalous magnetic structure and spin dynamics in magnetoelectric LiFePO4

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Title
Anomalous magnetic structure and spin dynamics in magnetoelectric LiFePO4
Author(s)
Toft-Petersen, R; Reehuis, M; Jensen, TBS; Andersen, NH; Li, JY; Manh Duc Le; Laver, M; Niedermayer, C; Klemke, B; Lefmann, K; Vaknin, D
Publication Date
2015-07
Journal
PHYSICAL REVIEW B, v.92, no.2, pp.024404 -
Publisher
AMER PHYSICAL SOC
Abstract
We report significant details of the magnetic structure and spin dynamics of LiFePO4 obtained by single-crystal neutron scattering. Our results confirm a previously reported collinear rotation of the spins away from the principal b axis, and they determine that the rotation is toward the a axis. In addition, we find a significant spin-canting component along c. The possible causes of these components are discussed, and their significance for the magnetoelectric effect is analyzed. Inelastic neutron scattering along the three principal directions reveals a highly anisotropic hard plane consistent with earlier susceptibility measurements. Using a spin Hamiltonian, we show that the spin dimensionality is intermediate between XY- and Ising-like, with an easy b axis and a hard c axis. It is shown that both next-nearest neighbor exchange couplings in the bc plane are in competition with the strongest nearest neighbor coupling. ©2015 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/3325
ISSN
2469-9950
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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