标题： 蜂窝螺旋自旋液态候选体中的巡游和拓扑激发 显示英文标题

标题： Itinerant and topological excitations in a honeycomb spiral spin liquid candidate

摘要： 具有受挫绝缘磁性的物质可以稳定螺旋自旋液态，这是由于螺旋构型的次扩展简并流形中的协同涨落所致，在倒易空间中基态波矢形成连续的轮廓或表面。无原子混合的蜂窝反铁磁体GdZnPO最近被提出作为有前途的螺旋自旋液态候选材料，它包含非平凡的拓扑激发。尽管引起了越来越多的兴趣，螺旋自旋液态的输运和拓扑性质在实验上仍大多未被探索。在这里，我们对高质量、电绝缘的GdZnPO单晶进行了输运测量。我们在低温度下观察到磁热导率下降至$\sim$50 mK，由$\kappa_{xx}^\mathrm{m}$ $\sim$ $\kappa_0+\kappa_1T$描述，其中$\kappa_0$和$\kappa_1$分别是与倒易空间中螺旋轮廓沿和偏离方向的激发相关的正常数。这种行为与磁比热类似，强调了存在于假定的螺旋自旋液态中的移动低能激发的存在。此外，观察到的正热霍尔效应证实了这些激发中至少部分具有拓扑性质。我们的发现为螺旋自旋液态候选材料中低能自旋激发的巡游性和拓扑性质提供了关键见解。 显示英文摘要

摘要： The frustrated insulating magnet can stabilize a spiral spin liquid, arising from cooperative fluctuations among a subextensively degenerate manifold of spiral configurations, with ground-state wave vectors forming a continuous contour or surface in reciprocal space. The atomic-mixing-free honeycomb antiferromagnet GdZnPO has recently emerged as a promising spiral spin-liquid candidate, hosting nontrivial topological excitations. Despite growing interest, the transport and topological properties of spiral spin liquids remain largely unexplored experimentally. Here, we report transport measurements on high-quality, electrically insulating GdZnPO single crystals. We observe a giant low-temperature magnetic thermal conductivity down to $\sim$50 mK, described by $\kappa_{xx}^\mathrm{m}$ $\sim$ $\kappa_0+\kappa_1T$, where both $\kappa_0$ and $\kappa_1$ are positive constants associated with excitations along and off the spiral contour in reciprocal space, respectively. This behavior parallels the magnetic specific heat, underscoring the presence of mobile low-energy excitations intrinsic to the putative spiral spin liquid. Furthermore, the observed positive thermal Hall effect confirms the topological nature of at least some of these excitations. Our findings provide key insights into the itinerant and topological properties of low-lying spin excitations in the spiral spin-liquid candidate.