3D Spin-Liquid State in an Organic Hyperkagome Lattice of Mott Dimers
3D Spin-Liquid State in an Organic Hyperkagome Lattice of Mott Dimers
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Mott 二聚体有机 Hyperkagome 晶格中的 3D 自旋液体状态
DOI：
10.1103/physrevlett.119.057201
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
and K. Awaga
中科院分区：
文献类型：
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作者：
A. Mizuno;Y. Shuku;M.M. Matsushita;M. Tsuchiizu;Y. Hara;N. Wada;Y. Shimizu;and K. Awaga
我们报告了第一个各向同性有机自旋的 3D 自旋液态。对手性有机自由基盐（TBA 表示四丁基铵，NDI 表示萘二酰亚胺）进行了结构分析以及磁力和热容测量，其中由于其三角形分子结构和 NDI 部分之间的分子间重叠而形成结构。该晶格与莫特二聚体的 hyperkagome 晶格相同，并且应该表现出 3D 自旋挫败。事实上，尽管高温磁化率遵循负韦斯常数的居里-韦斯定律，但低温磁测量表明没有低至 70 mK 的长程磁有序性，并表明在绝对零温度下存在具有大量残余顺磁性的自旋液态。低至 0.38 K 的 NMR 测量结果支持了这一点。此外，低至 68 mK 的低温热容清楚地表明自旋液态的存在，这可以在 0.07-4.5 K 的宽温度范围内符合幂律。
We report the first 3D spin liquid state of isotropic organic spins. Structural analysis, and magnetic and heat–capacity measurements were carried out for a chiral organic radical salt,(TBA denotes tetrabutylammonium and NDI denotes naphthalene diimide), in whichforms astructure due to its triangular molecular structure and an intermolecularoverlap between the NDI moieties. This lattice was identical to the hyperkagome lattice ofMott dimers, and should exhibit 3D spin frustration. In fact, even though the high-temperature magnetic susceptibility followed the Curie-Weiss law with a negative Weiss constant of, the low-temperature magnetic measurements revealed no long-range magnetic ordering down to 70 mK, and suggested the presence of a spin liquid state with a large residual paramagnetismofat the absolute zero temperature. This was supported by theNMR measurements down to 0.38 K. Further, the low-temperature heat capacitiesdown to 68 mK clearly indicated the presence offor the spin liquid state, which can be fitted to the power law ofin the wide temperature range 0.07–4.5 K.