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首页> 外文期刊>Physical review, B >Unconventional magnetism in the 4d(4)-based S=1 honeycomb system Ag3LiRu2O6
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Unconventional magnetism in the 4d(4)-based S=1 honeycomb system Ag3LiRu2O6

机译：4D（4）的非传统磁力 - 基于S = 1蜂窝系统AG3LIRU2O6

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摘要

We have investigated the thermodynamic and local magnetic properties of the Mott insulating system Ag3LiRu2O6 containing Ru4+ (4d(4)) for novel magnetism. The material crystallizes in a monoclinic C2/m structure with RuO6 octahedra forming an edge-shared two-dimensional honeycomb lattice with limited stacking order along the c direction. The large negative Curie-Weiss temperature (theta(CW) = -57 K) suggests antiferromagnetic interactions among Ru4+ ions, though magnetic susceptibility and heat capacity show no indication of magnetic long-range order down to 1.8 and 0.4 K, respectively. Li-7 nuclear magnetic resonance (NMR) shift follows the bulk susceptibility between 120 and 300 K and levels off below 120 K. Together with a power-law behavior in the temperature-dependent spin-lattice relaxation rate between 0.2 and 2 K, it suggest dynamic spin correlations with gapless excitations. Electronic structure calculations suggest an S = 1 description of the Ru moments and the possible importance of further neighbor interactions as well as biquadratic and ring-exchange terms in determining the magnetic properties. Analysis of our muon spin rotation data indicates spin freezing below 5 K, but the spins remain on the borderline between static and dynamic magnetism even at 20 mK.
机译：我们研究了含有Ru4 +（4D（4））的莫特绝缘系统Ag3liru2O6的热力学和局部磁性，用于新磁化。该材料用ruo6八面体的单斜型C2 / m结构结晶，沿C方向形成具有有限堆叠级的边缘共用的二维蜂窝晶格。大负居里 - 卫生温度（θ（cw）= -57 k）表明Ru4 +离子之间的反铁磁相互作用，尽管磁敏感性和热容量显示磁力远程顺序的指示分别为1.8和0.4k。 Li-7核磁共振（NMR）偏移遵循120至300K之间的散装敏感性，低于120 k的水平。在温度依赖性旋转晶格松弛率下的电力律行为在0.2和2k之间。建议与无间隙激励的动态自旋相关性。电子结构计算表明RU时刻的S = 1描述以及进一步邻居相互作用以及在确定磁性特性时的双层和环形交换术语的可能性。对μ子旋转旋转数据的分析表明静止在5 k以下，但旋转仍然位于静态和动态磁性之间的边界，即使在20 mk。

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