近伊辛自旋超固体中的横向序与纵向涨落
Transverse order and longitudinal fluctuations in a near-Ising spin supersolid
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中文总结 AI 辅助
研究S = 1/2三角晶格易轴反铁磁体K2Co(SeO3)2自旋超固体状态，通过中子散射，发现超固体序经连续BKT转变发展，最低温度下横向有序矩仅为纵向11%，低能自旋涨落主要是纵向，为超固体基态研究提供证据并限制微观理论。
中文摘要 AI 辅助
我们利用中子散射研究了S = 1/2三角晶格易轴反铁磁体K2Co(SeO3)2自旋超固体状态下有序矩的极化和低能自旋涨落。超固体序通过连续的BKT转变发展而来：纵向序在较高温度出现，而与玻色 - 爱因斯坦凝聚相关的横向分量仅在较低温度转变以下出现，且伴随着层间关联变化。在最低测量温度下，横向有序矩仅达到纵向分量的11%。此外，低能自旋涨落主要是纵向的。这些结果提供了直接证据，表明超固体基态即使在近伊辛 regime中也存在，并表现出纵向低能动力学，对三角晶格XXZ反铁磁体的微观理论施加了严格限制。
英文摘要
We investigate the polarization of the ordered moments and low-energy spin fluctuations in the spin supersolid state of the S = 1/2 triangular-lattice easy-axis antiferromagnet K2Co(SeO3)2 using neutron scattering. The supersolid order develops through successive BKT transitions: the longitudinal order appears at higher temperature, while the transverse component associated with the Bose-Einstein condensate emerges only below a lower-temperature transition accompanied by a change in the interlayer correlations. At the lowest measured temperature, the transverse ordered moment reaches only 11% of the longitudinal component. Moreover, the low-energy spin fluctuations are found to be predominantly longitudinal in character. These results provide direct evidence that the supersolid ground state survives even in the near-Ising regime and exhibits longitudinal low-energy dynamics, imposing stringent constraints on microscopic theories of triangular-lattice XXZ antiferromagnets.
