论文标题
蜂窝状li3co2SBO6的合成，结构和磁性具有其钠前体Na3co2SBO6的新数据
Synthesis, structure and magnetic properties of honeycomb-layered Li3Co2SbO6 with new data on its sodium precursor, Na3Co2SbO6
论文作者
论文摘要
LI3CO2SBO6是通过熔融盐离子交换制备的，其结构通过Rietveld方法完善，从而证实了其Na前体的蜂窝型CO/SB排序。直接通过高分辨率同步加速器XRD模式直接证明了Na3Co2SBO6的单斜形而不是三角对称性。在Na3Co2SBO6和LI3CO2SBO6中，远程抗铁磁阶分别在TN约6.7 K和9.9 K中建立，并由磁敏感性和特定热量确认。特定热数据的自旋波分析表明在LI3CO2SBO6中的Na3Co2SBO6和2D AFM磁子中存在3D AFM镁。磁化强度的场依赖性几乎在最多9吨的中等磁场中达到饱和度，并证明了磁场诱导的旋转旋转晶体跃迁的特征，这两个A3CO2SBO6（a = na，li）。总体热力学研究表明，两种化合物的磁性特性对外部磁场非常敏感，从而预测具有丰富磁相图的非平凡基态。 LI3CO2SBO6的基态自旋构型已通过低温中子粉末衍射确定。它代表了蜂窝层中矩的铁磁布置，在相邻层之间具有抗铁磁耦合。
Li3Co2SbO6 is prepared by molten salt ion exchange and its structure refined by the Rietveld method confirming the honeycomb-type Co/Sb ordering of its Na precursor. Monoclinic rather than trigonal symmetry of Na3Co2SbO6 is directly demonstrated for the first time by peak splitting in the high-resolution synchrotron XRD pattern. The long-range antiferromagnetic order is established at TN about 6.7 K and 9.9 K in Na3Co2SbO6 and Li3Co2SbO6, respectively, confirmed by both the magnetic susceptibility and specific heat. Spin-wave analysis of specific heat data indicates the presence of 3D AFM magnons in Na3Co2SbO6 and 2D AFM magnons in Li3Co2SbO6. The field dependence of the magnetization almost reaches saturation in moderate magnetic fields up to 9 T and demonstrates characteristic features of magnetic field induced spin-reorientation transitions for both A3Co2SbO6 (A = Na, Li). Overall thermodynamic studies show that the magnetic properties of both compounds are very sensitive to an external magnetic field, thus predicting a non-trivial ground state with a rich magnetic phase diagram. The ground state spin configuration of Li3Co2SbO6 has been determined by low-temperature neutron powder diffraction. It represents a ferromagnetic arrangement of moments in the honeycomb layers with antiferromagnetic coupling between adjacent layers.
