arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1601.01664cond-mat.mtrl-sci
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受抑磁体超分子类似物的编码复杂性

Encoding Complexity within Supramolecular Analogues of Frustrated Magnets

Andrew B. Cairns, Matthew J. Cliffe, Joseph A. M. Paddison, Dominik Daisenberger, Matthew G. Tucker, François-Xavier Coudert, Andrew L. Goodwin

摘要:

系统化学的核心思想是,超分子相互作用可以产生复杂和意想不到的集体状态,这些状态出现在与相互作用本身根本不同的长度尺度上。虽然在某些情况下-例如从协调构建块自组装病毒样多面体笼-有可能以系统的方式控制出现,但开发通用方法仍然是该领域的一个根本挑战。在概念上相关的受抑磁性领域--集体状态产生了与数据存储和自旋电子学相关的奇异物理学--通过控制复杂性产生的磁相互作用的几何形状和形式,预测涌现行为的任务得到了简化。寻求从这两个领域的方法相结合,我们在这里研究的无机聚合物链组装从非磁性的金(I)/银(I)阳离子和氰化物阴离子的固相。我们表明,周期性的链间电位编码的超分子相互作用,可以调整到模仿不同的XY自旋(“自旋转子”)之间的磁相互作用。由于链堆积在三角形晶格上,氰化金(I)/氰化银(I)的晶体结构可以用三角形XY磁体的相行为来解释。复杂的磁状态预测这个家庭-包括隐藏的四极顺序和新兴的自旋涡旋准粒子-实现了第一次在这些氰化物聚合物的结构化学。通过这种方式,我们展示了简单的无机材料如何表现为否则无法实现的“玩具”自旋模型的结构类似物,以及如何对这些模型进行理论理解,以预测和控制化学系统中出现的现象。

英文摘要:

At the heart of systems chemistry lies the idea that supramolecular interactions can give rise to complex and unexpected collective states that emerge on a fundamentally different lengthscale to that of the interactions themselves. While in certain cases - e.g. the self-assembly of virus-like polyhedral cages from coordination building blocks - it is possible to control emergence in a systematic manner, the development of general approaches remains a fundamental challenge in the field. In the conceptually-related domain of frustrated magnetism - where collective states give rise to exotic physics of relevance to data storage and spintronics - the task of predicting emergent behaviour is simplified through control over the geometry and form of the magnetic interactions from which complexity arises. Seeking to combine approaches from these two fields, we study here the solid phases of inorganic polymer chains assembled from non-magnetic gold(I)/silver(I) cations and cyanide anions. We show the periodic inter-chain potential encodes a supramolecular interaction that can be tuned to mimic different magnetic interactions between XY spins ("spin rotors"). Because the chains pack on a triangular lattice, the crystal structures of gold(I)/silver(I) cyanides can be interpreted in terms of the phase behaviour of triangular XY magnets. Complex magnetic states predicted for this family - including hidden quadrupolar order and emergent spin-vortex quasiparticles - are realised for the first time in the structural chemistry of these cyanide polymers. In this way we demonstrate both how simple inorganic materials might behave as structural analogues of otherwise-unrealisable "toy" spin models, and also how a theoretical understanding of those models might be used to predict and control emergent phenomena in chemical systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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