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Ba3BiPbREO(BO3)4 (RE = Pr, Nd, Gd, and Dy): two-dimensional rare-earth antiferromagnets with a geometrically-perfect
Yun Lv1, Yanhong Wang1,2, Nian Shi1
1Key Laboratory of Materials Chemistry for Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Hubei Key Laboratory of Materials Chemistry and Service Failure, Huazhong University of Science and Technology, Wuhan, 430074, China. HCl@hust.edu.cn.
Abstract:
The synthesis of novel two-dimensional (2D) triangular frustrated compounds is important for providing various platforms to investigate exotic quantum magnetism. Here, we successfully synthesised a series of RE-based magnetic compounds Ba3BiPbREO(BO3)4 (RE = Pr, Nd, Gd, and Dy) with a geometrically-perfect 2D triangular lattice directed by the triangular BO3 unit. These compounds stabilise 2D layered structures in the hexagonal (P63/mmc) crystal system, where magnetic ions are linked by BO3 to form a perfect triangular frustrated lattice. The magnetisation susceptibility results show that all synthesised compounds Ba3BiPbREO(BO3)4 exhibit dominant antiferromagnetic (AFM) interactions, with no long-range order (LRO) down to 2 K, which is further confirmed by specific heat measurements. Additionally, their thermal stability and attenuated total reflectance Fourier-transform infrared (ATR-FTIR) and ultraviolet-visible-near-infrared (UV-Vis-NIR) diffuse reflectance spectra are also reported. This work provides a series of RE-based magnetic compounds with a two-dimensional triangular frustrated lattice, offering novel model materials for further investigation on rare-earth-based frustrated magnetism.
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