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New insights into the structural properties of κ-(BEDT-TTF)2Ag2(CN)3 spin liquid.
Acta Crystallographica Section B ( IF 1.3 ) Pub Date : 2020-07-13 , DOI: 10.1107/s2052520620005545
Pascale Foury-Leylekian 1 , Vita Ilakovac 2 , Pierre Fertey 3 , Victor Baledent 1 , Ognjen Milat 4 , Kazuya Miyagawa 5 , Kazushi Kanoda 5 , Takaaki Hiramatsu 6 , Yukihiro Yoshida 6 , Gunzi Saito 6 , Pere Alemany 7 , Enric Canadell 8 , Silvia Tomic 4 , Jean Paul Pouget 1
Affiliation  

Here, the first accurate study is presented of the room‐temperature and 100 K structures of one of the first organic spin liquids, κ‐(BEDT‐TTF)2Ag2(CN)3. It is shown that the monoclinic structure determined previously is only the average one. It is shown that the exact structure presents triclinic symmetry with two non‐equivalent dimers in the unit cell. But surprisingly this does not lead to a sizeable charge disproportionation between dimers. The difference from the analogue compound κ‐(BEDT‐TTF)2Cu2(CN)3 which also presents a spin liquid phase is discussed in detail. The data provided here show the importance of the anionic layer and in particular the transition metal position in the process of symmetry breaking. The possible impact of the symmetry breaking, albeit weak, on the spin‐liquid mechanism and the influence of various disorders on the physical properties of this system is also discussed.

中文翻译:

κ-(BEDT-TTF)2Ag2(CN)3旋转液的结构性质的新见解。

在这里,对第一种有机自旋液体κ-(BEDT-TTF)2 Ag 2(CN)3的室温和100 K结构进行了首次精确研究。结果表明,先前确定的单斜结构仅为平均值。结果表明,精确的结构呈现出三斜对称性,在晶胞中有两个非等价的二聚体。但是令人惊讶的是,这不会导致二聚体之间相当大的电荷歧化。与类似化合物κ‐(BEDT‐TTF)2 Cu 2(CN)3的区别详细介绍了旋转液相。此处提供的数据显示了阴离子层的重要性,特别是在对称破坏过程中过渡金属的位置。还讨论了对称破坏(尽管很弱)对自旋液体机制的可能影响,以及各种紊乱对系统物理特性的影响。
更新日期:2020-07-13
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