A quantum spin liquid candidate in a two dimensional CoII and RhIII bimetallic oxalate network

A quantum spin liquid (QSL) is a system of interacting spins for which quantum fluctuations prevent long-range magnetic order (LRO), even at zero temperature. The search for experimental realisations of a QSL is a highly active field, and the 2D honeycomb network provided by metal-oxalate coordination polymers is a promising route to explore. Here, we propose to carry out muon-spin relaxation (µSR) measurement on a novel candidate QSL comprising a two dimensional CoII and RhIII bimetallic oxalate network. We will use zero-field µSR to confirm the absence of LRO. Longitudinal field µSR will then be used to study the dynamics of the diffusing spinons and compare these with the predictions of currently available theoretical models.

量子自旋液体（quantum spin liquid, QSL）是一类由相互作用自旋组成的体系，即便处于绝对零度，量子涨落也会阻止其形成长程磁有序（long-range magnetic order, LRO）。对QSL实验实现方案的探索是当前高度活跃的研究领域，而由金属草酸盐配位聚合物构筑的二维蜂窝状网络，正是极具潜力的探索路径之一。本文提出将针对一种新型QSL候选体系开展μ子自旋弛豫（muon-spin relaxation, µSR）测量，该体系由二维二价钴（Co(II)）与三价铑（Rh(III)）双金属草酸盐网络构成。我们将采用零场µSR实验验证该体系不存在长程磁有序；随后借助纵向场µSR实验研究扩散型自旋子的动力学行为，并将实验结果与现有主流理论模型的预测进行对比。