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Anomalous magnetic structure and spin dynamics in magnetoelectric LiFePO4
Authors
NH Andersen
TBS Jensen
+9 more
B Klemke
M Laver
K Lefmann
JY Li
Manh Duc Le
C Niedermayer
M Reehuis
R Toft-Petersen
D Vaknin
Publication date
1 October 2018
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 Society8
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Last time updated on 06/02/2020