论文标题
[MO3+]
Magnetic order and spin liquid behavior in [Mo3+]^{11+} triangular magnets
论文作者
论文摘要
基于[Mo $ _3 $] $^{11+} $单位的分子磁铁，每个三聚体一个未配对的电子引起了最近的兴趣，因为在某些家庭成员中识别了量子旋转液体鉴定。在这里，我们介绍了Znscmo的多晶样品$ _3 $ o $ $ _8 $，mgscmo $ _3 $ _3 $ o $ _8 $和na $ _3 $ _3 $ sc $ _2 $ mo $ $ _5 $ _5 $ _ {16} $具有相同的mo $ $ $ _3 $ o $ o $ o $ o _ $ _AMPAINTION。用X射线或中子粉末衍射表征了晶体结构，并通过执行AC和DC易感性，比热，中子粉末衍射和$μ$ $ SR的测量来确定磁接地态。我们的工作表明Znscmo $ _3 $ o $ _8 $和mgscmo $ _3 $ o $ $ _8 $具有18.5 k和11.9 k的铁磁性居里 - 韦斯 - 韦斯 - 韦斯 - 韦斯 - 温度为11.9 K $ <$ 2 K。另一方面，Na $ _3 $ sc $ _2 $ mo $ $ _5 $ o $ o $ _ {16} $容纳动态磁接地状态，没有磁性订购的证据或旋转到20 mk，尽管抗铁磁curie curie curie -weiss -weiss -weiss -weiss -weiss -weiss -weiss温度为-36.2 k，因此是量子旋转液体液体行为的候选。通过将目前的结果与过去对同一材料家族的工作进行比较，我们构建了一个相图，该相图说明这些基于MO的分子磁体的磁接地态对最近的邻居Mo-Mo距离的小变化非常敏感。
Molecular magnets based on [Mo$_3$]$^{11+}$ units with one unpaired electron per trimer have attracted recent interest due to the identification of quantum spin liquid candidacy in some family members. Here, we present comprehensive measurements on polycrystalline samples of ZnScMo$_3$O$_8$, MgScMo$_3$O$_8$, and Na$_3$Sc$_2$Mo$_5$O$_{16}$ with the same Mo$_3$O$_{13}$ magnetic building blocks. The crystal structures are characterized with x-ray or neutron powder diffraction and the magnetic ground states are determined by performing ac and dc susceptibility, specific heat, neutron powder diffraction, and $μ$SR measurements. Our work indicates that ZnScMo$_3$O$_8$ and MgScMo$_3$O$_8$ have ferromagnetic Curie-Weiss temperatures of 18.5 K and 11.9 K, ordered ground states with net moments (low-moment ferromagnetism or canted antiferromagnetism), and zero field ordering temperatures of $T_c =$ 6 K and $<$ 2 K respectively. On the other hand, Na$_3$Sc$_2$Mo$_5$O$_{16}$ hosts a dynamical magnetic ground state with no evidence for magnetic ordering or spin freezing down to 20 mK despite an antiferromagnetic Curie-Weiss temperature of -36.2 K, and therefore is a candidate for quantum spin liquid behavior. By comparing the present results to past work on the same family of materials, we construct a phase diagram which illustrates that the magnetic ground states of these Mo-based molecular magnets are very sensitive to small changes in the nearest neighbor Mo-Mo distance.
