发表机构
University of Wisconsin-Milwaukee; University of Missouri; Brookhaven National Laboratory; Ames National Laboratory; Iowa State University; Simon Fraser University; Argonne National Laboratory（密尔沃基威斯康星大学; 密苏里大学; 布鲁克海文国家实验室; 艾姆斯国家实验室; 爱荷华州立大学; 西蒙菲莎大学; 阿贡国家实验室）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
通过中子与X射线散射实验，确定了TbCuAs$_2$的反铁磁有序细节，并与同类化合物对比，提出低温电阻率异常的共同物理机制。
AI 中文摘要
我们研究了反铁磁金属TbCuAs$_2$，该材料在低温下表现出异常的电阻率上升。这种电阻率上升被认为源于材料的磁性基态；然而，该化合物中反铁磁有序的精确性质此前尚未被确定。在此，我们展示了针对TbCuAs$_2$的单晶中子衍射、X射线共振磁散射和单晶X射线衍射联合研究。这些测量明确确定了Tb磁矩方向、沿高对称方向的反铁磁排列、结构与磁性之间的相互作用及其温度依赖性。我们的观察结果与对稀土铜砷化物家族（$R$CuAs$_2$，$R$ = Sm和Gd）中姊妹化合物的先前研究进行了比较，这些化合物也表现出电阻率异常。我们提出，对于表现出低温电阻率异常的稀土铜砷化物，其结构和磁性性质存在共同的底层物理机制。
英文摘要
We investigated antiferromagnetic metal TbCuAs$_2$, which exhibits an anomalous resistivity upturn at low temperatures. This resistivity upturn has been proposed to originate from the material's magnetic ground state; however, the precise nature of the antiferromagnetic ordering in this compound has not been previously established. Here, we present a combined single crystal neutron diffraction, X-ray resonant magnetic scattering, and single crystal X-ray diffraction study of TbCuAs$_2$. These measurements unambiguously determine the Tb magnetic moment direction, the antiferromagnetic arrangement along high symmetry directions, the interplay between structure and magnetism, and their temperature dependence. Our observations are compared with previous studies on sister compounds in the rare-earth copper arsenide family ($R$CuAs$_2$, $R$ = Sm and Gd), which also displays resistivity anomalies. We suggest a common underlying physics governing the structural and magentic properties of rare-earth copper arsenides that exhibit low-temperature resistivity anomalies.
