Magnetic order and spin liquid behavior in [Mo3]11+ molecular magnets
Magnetic order and spin liquid behavior in [Mo3]11+ molecular magnets
复制标题
[Mo3]11 分子磁体中的磁序和自旋液体行为
DOI：
10.1103/physrevmaterials.6.044414
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发表时间：
2022
影响因子：
3.4
通讯作者：
Bazier-Matte, X.
中科院分区：
文献类型：
--
作者：
Chen, Q.;Sinclair, R.;Akbari-Sharbaf, A.;Huang, Q.;Dun, Z.;Choi, E. S.;Mourigal, M.;Verrier, A.;Rouane, R.;Bazier-Matte, X.
由于在一些家族成员中鉴定出了量子自旋液体候选者，基于每个三聚体具有一个不成对电子的单元的分子磁体最近引起了人们的兴趣。在这里，我们展示了对 、 和 具有相同磁性构件的多晶样品的全面测量。晶体结构通过 X 射线或中子粉末衍射进行表征，磁性基态通过进行交流和直流磁化率、比热、中子粉末衍射和 μ 子自旋弛豫测量来确定。我们的工作表明， 和 的铁磁居里-韦斯温度分别为 18.5 和 11.9 K、具有净矩的有序基态（低矩铁磁性或倾斜反铁磁性）以及分别为 6 K 和 2 K 的零场有序温度。另一方面，尽管反铁磁居里-维斯温度为 K，但仍具有动态磁基态，没有证据表明磁有序或自旋冻结低至 20 mK，因此是量子自旋液体行为的候选者。通过将当前结果与过去对同一族材料的研究进行比较，我们构建了一个相图，该图说明这些钼基分子磁体的磁性基态对最近邻 Mo-Mo 距离的微小变化非常敏感。
Molecular magnets based onunits 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,, andwith the samemagnetic 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 muon spin relaxation measurements. Our work indicates thatandhave ferromagnetic Curie-Weiss temperatures of 18.5 and 11.9 K, ordered ground states with net moments (low-moment ferromagnetism or canted antiferromagnetism), and zero field ordering temperatures of6 K and2 K, respectively. On the other hand,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 ofK, 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.