In RuCl₃, inelastic neutron scattering and Raman spectroscopy reveal a continuum of non-spin-wave excitations that persists to high temperature, suggesting the presence of a spin liquid state on a honeycomb lattice. In the context of the Kitaev model, finite magnetic fields introduce interactions between the elementary excitations, and thus the effects of high magnetic fields that are comparable to the spin-exchange energy scale must be explored. Here, we report measurements of the magnetotropic coefficient—the thermodynamic coefficient associated with magnetic anisotropy—over a wide range of magnetic fields and temperatures. We find that magnetic field and temperature compete to determine the magnetic response in a way that is independent of the large intrinsic exchange-interaction energy. This emergent scale-invariant magnetic anisotropy provides evidence for a high degree of exchange frustration that favours the formation of a spin liquid state in RuCl₃.

在RuCl _3中，非弹性中子散射和拉曼光谱揭示了持续到高温的非自旋波激发的连续性，这表明在蜂窝晶格上存在自旋液态。在Kitaev模型的背景下，有限磁场会在基本激发之间引入相互作用，因此必须探索与自旋交换能级相当的高磁场的影响。在这里，我们报告了在很宽的磁场和温度范围内的同磁系数（与磁各向异性相关的热力学系数）的测量结果。我们发现磁场和温度以独立于大的固有交换相互作用能的方式竞争确定磁响应。₃。