Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.
Department of Physics, University of Arizona, Tucson, AZ, 85721, USA.
Nat Commun. 2023 Jun 19;14(1):3641. doi: 10.1038/s41467-023-39409-1.
A 2-Q antiferromagnetic order of the ferromagnetic dimers was found below T = 2.9 K in the Shastry-Sutherland lattice BaNdZnS by single crystal neutron diffraction. The magnetic order can be understood by the orthogonal arrangement of local Ising Nd spins, identified by polarized neutrons. A field was applied along [1 -1 0] to probe the observed metamagnetic transition in the magnetization measurement. The field decouples two magnetic sublattices corresponding to the propagation vectors q = (½, ½, 0) and q = (-½, ½, 0), respectively. Each sublattice shows a "stripe" order with a Néel-type arrangement in each single layer. The "stripe" order with q remains nearly intact up to 6 T, while the other one with q is suppressed at a critical field H ~1.7 T, indicating a partial disorder. The H varies with temperature and is manifested in the H-T phase diagram constructed by measuring the magnetization in BaNdZnS.
通过单晶中子衍射发现，Shastry-Sutherland 晶格 BaNdZnS 在 T=2.9K 以下呈现出 2-Q 反铁磁有序。通过极化中子可以识别出局部 Ising Nd 自旋的正交排列，从而理解这种磁有序。磁场沿 [1-1-0] 方向施加，以探测磁化测量中观察到的顺磁转变。该磁场分别解耦了对应于传播矢量 q = (1/2, 1/2, 0) 和 q = (-1/2, 1/2, 0) 的两个磁子晶格。每个子晶格都呈现出具有尼尔型排列的“条纹”有序。具有 q 的“条纹”有序在高达 6T 的范围内几乎保持完整，而另一个具有 q 的有序则在临界场 H~1.7T 处被抑制，表明存在部分无序。H 随温度变化，并通过测量 BaNdZnS 中的磁化来构建 H-T 相图得以体现。
