Magnetic structure and magnon dynamics of the quasi-two-dimensional antiferromagnet FePS3
Magnetic structure and magnon dynamics of the quasi-two-dimensional antiferromagnet FePS3
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DOI：
10.1103/physrevb.94.214407
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发表时间：
2016-12-07
影响因子：
3.7
通讯作者：
Wildes, A. R.
中科院分区：
文献类型：
--
作者：
Lancon, D.;Walker, H. C.;Wildes, A. R.
利用单晶中子散射方法研究了具有蜂窝晶格的S = 2 Ising类准二维反铁磁体FePS 3的磁结构和磁振子动力学。磁结构已被证实具有磁传播矢量k（M）= [01 1/2]，并且力矩与ab平面的法线共线。磁振子数据可以使用具有单离子各向异性的海森堡哈密顿量来建模。磁相互作用的第三个面内最近的邻居需要包括一个合适的拟合。面内交换相互作用的最佳拟合参数为J（1）= 1.46，J（2）=-0.04，J（3）= -0.96 meV。单离子各向异性很大，Delta = 2.66 meV，解释了化合物中磁性的Ising样行为。层间交换非常小，J' = -0.0073 meV，证明FePS 3是二维磁体的非常好的近似。
Neutron scattering from single crystals has been used to determine the magnetic structure and magnon dynamics of FePS3, an S = 2 Ising-like quasi-two-dimensional antiferromagnet with a honeycomb lattice. The magnetic structure has been confirmed to have a magnetic propagation vector of k(M) = [01 1/2] and the moments are collinear with the normal to the ab planes. The magnon data could be modeled using a Heisenberg Hamiltonian with a single-ion anisotropy. Magnetic interactions up to the third in-plane nearest neighbor needed to be included for a suitable fit. The best fit parameters for the in-plane exchange interactions were J(1) = 1.46, J(2) = -0.04, and J(3) = -0.96 meV. The single-ion anisotropy is large, Delta = 2.66 meV, explaining the Ising-like behavior of the magnetism in the compound. The interlayer exchange is very small, J' = -0.0073 meV, proving that FePS3 is a very good approximation to a two-dimensional magnet.