Liu B-Q, Park S-H, Čermák P, Schneidewind A, Xiao Y
Key Laboratory of Neutron Physics, Institute of Nuclear Physics and Chemistry, CAEP, Mianyang 621900, People's Republic of China. Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstrasse 1, 85748 Garching, Germany.
J Phys Condens Matter. 2018 Jul 25;30(29):295401. doi: 10.1088/1361-648X/aaca67. Epub 2018 Jun 5.
The spin wave dispersions of the low temperature antiferromagnetic phase (AF1) MnWO have been numerically calculated based on the recently reported non-collinear spin configuration with two different canting angles. A Heisenberg model with competing magnetic exchange couplings and single-ion anisotropy terms could properly describe the spin wave excitations, including the newly observed low-lying energy excitation mode [Formula: see text] meV appearing at the magnetic zone centre. The spin wave dispersion and intensities are highly sensitive to two differently aligned spin-canting sublattices in the AF1 model. Thus this study reinsures the otherwise hardly provable hidden polar character in MnWO.
基于最近报道的具有两种不同倾斜角的非共线自旋构型，对低温反铁磁相（AF1）MnWO的自旋波色散进行了数值计算。一个具有竞争磁交换耦合和单离子各向异性项的海森堡模型能够恰当地描述自旋波激发，包括在磁区中心新观察到的低能激发模式[公式：见正文]毫电子伏特。自旋波色散和强度对AF1模型中两个不同排列的自旋倾斜亚晶格高度敏感。因此，本研究再次证实了MnWO中难以证明的隐藏极性特征。
