论文标题
倾斜场中的易于平面抗铁磁体：镁光谱中的差距和敏感性
Easy-plane antiferromagnet in tilted field: gap in magnon spectrum and susceptibility
论文作者
论文摘要
最新的关于二氯 - 特拉基斯硫核（DTN）的实验数据的动机[T.A. Soldatov $ \ textit {et al} $，物理。 Rev. b $ {\ bf 101} $，104410（2020）]，一种在倾斜外部磁场中带有单离子易于平面各向异性的四方晶格上的抗fiferromagnet模型。使用平面内场分量的较小度，我们通过分析地解决了在``声学'''木元素模式下的能量差距的场依赖性，并在有序阶段分析了横向均匀的磁敏感性。结果表明，由于量子波动，前者是非单调的，这确实是通过实验观察到的。后者本质上取决于两个磁蛋白上的``光学''磁化速率。在靠近有序阶段中心的磁场上，它导致实验观察到的动力学磁性现象。
Motivated by recent experimental data on dichloro-tetrakis thiourea-nickel (DTN) [T.A. Soldatov $\textit{et al}$, Phys. Rev. B ${\bf 101}$, 104410 (2020)], a model of antiferromagnet on a tetragonal lattice with single-ion easy-plane anisotropy in the tilted external magnetic field is considered. Using the smallness of the in-plane field component, we analytically address field dependence of the energy gap in ``acoustic'' magnon mode and transverse uniform magnetic susceptibility in the ordered phase. It is shown that the former is non-monotonic due to quantum fluctuations, which was indeed observed experimentally. The latter is essentially dependent on the ``optical'' magnon rate of decay on two magnons. At magnetic fields close to the one which corresponds to the center of the ordered phase, it leads to experimentally observed dynamical diamagnetism phenomenon.
