Chung K T K, Goh J S K, Mukherjee A, Jin W, Lozano-Gómez D, Gingras M J P
Department of Physics and Astronomy, University of Waterloo, Ontario N2L 3G1, Canada.
Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link 637371, Singapore.
Phys Rev Lett. 2022 Mar 11;128(10):107201. doi: 10.1103/PhysRevLett.128.107201.
In this Letter, we illustrate how polarized neutron scattering can be used to isolate the spin-spin correlations of modes forming flat bands in a frustrated magnetic system hosting a classical spin liquid phase. In particular, we explain why the nearest-neighbor spin ice model, whose interaction matrix has two flat bands, produces a dispersionless (i.e., "flat") response in the non-spin-flip (NSF) polarized neutron scattering channel and demonstrate that NSF scattering is a highly sensitive probe of correlations induced by weak perturbations that lift the flat band degeneracy. We use this to explain the experimentally measured dispersive (i.e., nonflat) NSF channel of the dipolar spin ice compound Ho_{2}Ti_{2}O_{7}.
在本信函中，我们阐述了极化中子散射如何用于在具有经典自旋液体相的受挫磁系统中分离形成平带的模式的自旋 - 自旋关联。特别地，我们解释了为何其相互作用矩阵有两个平带的最近邻自旋冰模型，在非自旋翻转（NSF）极化中子散射通道中产生无色散（即“平的”）响应，并证明NSF散射是由解除平带简并的弱微扰所诱导的关联的高度灵敏探针。我们借此解释了偶极自旋冰化合物Ho₂Ti₂O₇实验测量得到的色散（即非平的）NSF通道。
