Magnetic, thermodynamic, neutron diffraction and inelastic neutron scattering are used to study spin correlations in the easy-axis 𝑋⁢𝑋⁢𝑍 triangular lattice magnet K2⁢Co⁢(SeO3)2. Despite the presence of quasi-2D “supersolid” magnetic order, the low-energy excitation spectrum contains no sharp modes and is instead a broad and structured multiparticle continuum. Applying a weak magnetic field drives the system into an 𝑚=1/3 fractional magnetization plateau phase and restores sharp spin wave modes. To some extent, the behavior at zero field can be understood in terms of spin wave decay. However, the presence of clear excitation minima at the 𝑀 points of the Brillouin zone suggest that the spinon language may provide a more adequate description, and signals a possible proximity to a Dirac spin liquid state.

中文翻译：

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三角形晶格上的自旋超固体中的连续体激发


磁性、热力学、中子衍射和非弹性中子散射用于研究易轴 XXZ 三角晶格磁体 K2Co（SeO3）2 中的自旋相关性。尽管存在准 2D “超固体”磁序，但低能激发光谱不包含尖锐模式，而是一个宽阔而结构化的多粒子连续体。施加弱磁场会使系统进入 m=1/3 分数磁化平台期，并恢复尖锐的自旋波模式。在某种程度上，零场的行为可以用自旋波衰减来理解。然而，在 Brillouin 区的 M 点存在明显的激发最小值，这表明自旋语言可能提供更充分的描述，并表明可能接近 Dirac 自旋液态。