Year: 2026
Type: preprint
Abstract: 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.
Source: arXiv (Cornell University)
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: U.S. Department of Energy, University of Wisconsin-Milwaukee, Iowa State University, Canada Research Chairs, Office of Science, Natural Sciences and Engineering Research Council of Canada, Argonne National Laboratory, Brookhaven National Laboratory, Division of Materials Sciences and Engineering
Awards: G102163711, G107546177, G1285306620, G1313983767, G1418315740, G1519358529, G1664757510, G171842289, G1866217153, G2110534122, G2287611682, G2354036397, G237429762, G241279073, G249831736, G262962599, G3075337988, G3262563802, G333242795, G3546016435, G357145406, G3653214873, G498139845, G524707868, G5535608740, G5765906131, G5959670421, G6918803902, G7463374569, G8943864594, G993149817
OpenAlex ID: W7214042112