论文标题
单晶警察的自旋波谱$ _3 $
Spin wave spectra of single crystal CoPS$_3$
论文作者
论文摘要
使用非弹性中子散射测量了分层范德华抗抗铁磁体COPS的单晶中的自旋波。数据显示了布里鲁因区中心的四个不同（$ \ gtrsim 14 $ MEV）的较大（$ \ gtrsim 14 $ MEV）的旋转波分支，表明明显各向异性。数据是使用源自海森堡哈密顿量的线性自旋波理论对数据进行建模的。需要在分层平面中的交换互动以达到第三个最接近的纽布尔，以适应第一个邻居之间的铁磁$ J_1 = -1.37 $ MEV，Antiferromagnetic $ J_3 = 3.0 $ MEV之间的第三邻居和非常小的$ J_2 = 0.09 $ MEV之间的$ J_2 = 0.09 $ MEV。需要双轴单动各向异性，与平行于对齐的矩方向平行的轴线$ d^x = -0.77 $ MEV，Coplanar项$ d^z = 6.07 $ MEV，对于轴，大约正常的轴与分层的晶体平面。
The spin waves in single crystals of the layered van der Waals antiferromagnet CoPS$_3$ have been measured using inelastic neutron scattering. The data show four distinct spin wave branches with large ($\gtrsim 14$ meV) energy gaps at the Brillouin zone center indicating significant anisotropy. The data were modelled using linear spin wave theory derived from a Heisenberg Hamiltonian. Exchange interactions up to the third nearest-neighbour in the layered planes were required to fit the data with ferromagnetic $J_1 = -1.37$ meV between first neighbours, antiferromagnetic $J_3 = 3.0$ meV between third neighbours, and a very small $J_2 = 0.09$ meV between second neighbours. A biaxial single-ion anisotropy was required, with a collinear term $D^x = -0.77$ meV for the axis parallel to the aligned moment direction and a coplanar term $D^z=6.07$ meV for an axis approximately normal to the layered crystal planes.
