论文标题
Ferrimagnetic 120 $^\ circ $ cu2oso4中的磁性结构
Ferrimagnetic 120$^\circ$ magnetic structure in Cu2OSO4
论文作者
论文摘要
我们报告了在粉末和单晶上测量的3D $^9 $（Cu $^{2+}）的磁性特性。该化合物形式层的磁原子可以将其几何形状描述为链条通过二聚体耦合的链系统，也可以作为Kagomé晶格，其中每个3旋转被二聚体代替。特定的热量和DC敏感性显示在20 K处的磁过渡，也通过中子散射证实。从特定的热数据中提取的磁熵与$ s = 1/2 $的自由度每cu $^{2+} $一致，因此从DC敏感性中提取的有效力矩也是如此。基态已通过粉末和单晶体上的中子衍射鉴定，对应于$ \ sim120 $度自旋结构，其中铁电磁内二聚体比对产生净铁磁磁矩。找不到向晶格对称变化降至2 k的证据。我们的结果表明，\ Sample \代表一种新型的模型晶格，具有沮丧的相互作用，在这些模型中，可以探索磁性秩序，热和量子波动之间的相互作用。
We report magnetic properties of a 3d$^9$ (Cu$^{2+}$) magnetic insulator Cu2OSO4 measured on both powder and single crystal. The magnetic atoms of this compound form layers, whose geometry can be described either as a system of chains coupled through dimers or as a Kagomé lattice where every 3rd spin is replaced by a dimer. Specific heat and DC-susceptibility show a magnetic transition at 20 K, which is also confirmed by neutron scattering. Magnetic entropy extracted from the specific heat data is consistent with a $S=1/2$ degree of freedom per Cu$^{2+}$, and so is the effective moment extracted from DC-susceptibility. The ground state has been identified by means of neutron diffraction on both powder and single crystal and corresponds to a $\sim120$ degree spin structure in which ferromagnetic intra-dimer alignment results in a net ferrimagnetic moment. No evidence is found for a change in lattice symmetry down to 2 K. Our results suggest that \sample \ represents a new type of model lattice with frustrated interactions where interplay between magnetic order, thermal and quantum fluctuations can be explored.
