标题： Ru掺杂对Ag3LiIr2O6磁性的影响，一种候选的Kitaev量子自旋液体 显示英文标题

标题： Effects of Ru-doping on the magnetism of Ag3LiIr2O6, a candidate Kitaev quantum spin liquid

摘要： 我们报告了对Ag3LiIr1.4Ru0.6O6的研究，该物质是Ag3LiIr2O6（Kitaev量子自旋液体候选物）中Ru取代的结果。 它像其母化合物Ag3LiIr2O6一样结晶在单斜C2/m空间群中。 我们的磁化率测量显示有效磁矩=2.6 muB，高于母化合物的磁矩，但低于Ru类似物（Ag3LiRu2O6）的磁矩，表明存在磁性Ir4+（Jeff=1/2）和Ru4+（S=1）。 体磁化率表明在T~20 K时出现长程有序（LRO），而热容中没有明显的特征。 同样，在T~20 K附近7Li NMR谱强度有所下降，这与LRO开始时的预期一致，但不像Ag3LiIr2O6中的结果那样完全消失。 在T~20 K时，7Li NMR弛豫率也出现异常，并且随着温度降低，7Li NMR位移下降。 这些结果表明在Ag3LiIr1.4Ru0.6O6中T~20 K时出现LRO。 然而，在10 K以下的低温下，我们观察到磁比热和自旋晶格弛豫率呈幂律变化，温度独立的7K，且7Li NMR谱强度没有进一步损失。 这些结果可能表明在10 K以下Ag3LiIr1.4Ru0.6O6中存在量子自旋液体类似相的持续或稳定，可能是样品的一部分。 我们的穆子自旋弛豫测量表明在约20 K时出现有序，与其他探测结果一致。 看起来，Ru取代的主要效果是将LRO温度相对于Ag3LiIr2O6提高，尽管在约10 K以下有新相的迹象。 显示英文摘要

摘要： We report our investigations on Ag3LiIr1.4Ru0.6O6, which results from the Ru substitution in the Kitaev quantum spin liquid candidate Ag3LiIr2O6. It crystallizes in the monoclinic C2/m space group like its parent compound, Ag3LiIr2O6. Our susceptibility measurements reveal an effective moment = 2.6 muB, which is higher than the moments of the parent compound and less than that of the Ru-analog (Ag3LiRu2O6), suggesting the presence of magnetic Ir4+ (Jeff= 1/2) and Ru4+ (S=1). Bulk magnetic susceptibility suggests long-range order (LRO)at T~20 K, whereas no clear signature is present in the heat capacity. Likewise, there is a loss of the 7Li NMR spectral intensity around T~20 K as expected at the onset of LRO, but a complete wipe-out is not seen in contrast to the result in Ag3LiIr2O6. There is also a T~20 K anomaly in the 7Li NMR relaxation rate and also a fall in the 7Li NMR shift with decreasing temperature. These results suggest LRO at T~20 K in Ag3LiIr1.4Ru0.6O6. However, at low-T below 10 K, we observe a power law variation in magnetic heat capacity and spin lattice relaxation rate, temperature-independent-7K, and no further loss of the 7Li NMR spectral intensity. These results might suggest the persistence or stabilisation of a quantum spin liquid-like phase, perhaps from a fraction of the sample in Ag3LiIr1.4Ru0.6O6 below 10 K. Our muon spin relaxation measurements suggest ordering around 20 K, consistent with our other probes. It appears that the main effect of Ru-substitution is to shift the LRO to a higher temperature in comparison with Ag3LiIr2O6, though there are signatures of a novel phase below about 10 K.