Synthesis and Characterizations of Two-Dimensional Rare-Earth Magnetic Compounds RE 2 O 2 CN 2 (RE = Nd, Dy, Gd) with a Frustrated Triangular Spin–Lattice

作者：Yun Lv, Yanhong Wang, Yaling Dou, Ang Li, Jinkui Tang, О. С. Волкова, A. N. Vasiliev, Hongcheng Lu · 发表于：Crystal Growth & Design · 年份：2025 · DOI：10.1021/acs.cgd.4c01670 · 被引用次数：4 · 研究领域：Advanced Condensed Matter Physics、Inorganic Chemistry and Materials、Organic and Molecular Conductors Research

We report the synthesis and magnetic properties of three rare-earth magnetic compounds RE 2 O 2 CN 2 (RE = Nd, Dy, Gd) with a frustrated triangular spin–lattice, as well as their thermal stability and Fourier transform infrared (FTIR) spectroscopy. The magnetic susceptibility results show paramagnetic behavior with no long-range order (LRO) down to 2 K in Nd 2 O 2 CN 2 and Dy 2 O 2 CN 2 due to spin frustration, which are further confirmed by the specific heat measurements, despite the large Curie–Weiss temperature for strong intralayer interaction through the RE–O–RE pathway (RE = Nd, Dy). While Gd 2 O 2 CN 2 with a large spin exhibits LRO at 2.7 K, which should be caused by the non-negligible interlayer interactions. The field-dependent magnetization curves show a linear increase up to 7 T for Nd 2 O 2 CN 2 and Gd 2 O 2 CN 2, which are far from their saturation. While the magnetization of Dy 2 O 2 CN 2 increases linearly below 3 T, then slowly increases to saturation, and the magnetization value is 6.62 μ B at 7 T. Our work provides promising magnetic triangular lattice systems to further investigate frustration and quantum magnetism in rare-earth magnetic systems.