论文标题
从自旋液体到各向异性kagome y-kapellasite y3cu9（OH）19cl8中的磁顺序：一次晶体研究
From spin liquid to magnetic ordering in the anisotropic kagome Y-Kapellasite Y3Cu9(OH)19Cl8: a single crystal study
论文作者
论文摘要
Y3CU9（OH）19Cl8实现了一个原始的各向异性kagome模型，该模型带有丰富的磁相图[M. Hering等人，NPJ计算材料8，1（2022）]。我们通过外部梯度方法提出了改进的大相位单晶的合成。通过易感性，比热，热膨胀，中子散射以及局部MUSR和NMR技术对这些晶体进行了细节研究。与多核样品的不同，单晶体的研究为33K和13K处微妙的结构不稳定性提供了证据，这些结构不稳定性保留了系统的全局对称性，从而保留了磁模型。在2.1k时，该化合物显示出磁性过渡到共面（1/3,1/3）的远距离顺序，如理论上所预测的。但是，我们对自旋波激发的分析产生了磁相互作用，该磁相互作用将化合物定位到相位边界靠近经典的自旋液相。在该边界处增强的量子波动可能导致CU2+的有序矩降低，估计为来自MUSR的0.075mub。
Y3Cu9(OH)19Cl8 realizes an original anisotropic kagome model hosting a rich magnetic phase diagram [M. Hering et al, npj Computational Materials 8, 1 (2022)]. We present an improved synthesis of large phase-pure single crystals via an external gradient method. These crystals were investigated in details by susceptibility, specific heat, thermal expansion, neutron scattering and local muSR and NMR techniques. At variance with polycristalline samples, the study of single crystals gives evidence for subtle structural instabilities at 33K and 13K which preserve the global symmetry of the system and thus the magnetic model. At 2.1K the compound shows a magnetic transition to a coplanar (1/3,1/3) long range order as predicted theoretically. However our analysis of the spin wave excitations yields magnetic interactions which locate the compound closer to the phase boundary to a classical jammed spin liquid phase. Enhanced quantum fluctuations at this boundary may be responsible for the strongly reduced ordered moment of the Cu2+, estimated to be 0.075muB from muSR.
