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Triangular Rare-Earth Lattice Materials RbBa R (BO 3 ) 2 ( R = Y, Gd–Yb) and Comparison to the KBa R (BO 3 ) 2 Analogs

2019; American Chemical Society; Volume: 58; Issue: 5 Linguagem: Inglês

10.1021/acs.inorgchem.8b03372

1520-510X

Shu Guo, Tai Kong, Weiwei Xie, Loi T. Nguyen, Karoline Stolze, F. Alex Cevallos, R. J. Cava,

Iron-based superconductors research

A previously unreported family of electrically insulating rare-earth borates, RbBaR(BO3)2 (R = Y, Gd–Yb), was designed and then successfully obtained by traditional solid-state reaction. They crystallize in a monoclinic crystal system space group P21/m (No. 11). They feature triangular planar rare-earth (R) lattices, which are part of, for example, [Yb(BO3)2]3– infinite 2D layers. These R-based triangular lattices are stacked with layers of crystallographically ordered Rb and Ba atoms to build the 3D structures. Polycrystalline samples of RbBaR(BO3)2 were used to study the elementary magnetic properties, and millimeter-size RbBaYb(BO3)2 single crystals were grown by spontaneous nucleation for further anisotropic magnetic characterization. Antiferromagnetic spin interactions are observed for all magnetic compounds, and no long-range magnetic ordering is found down to 1.8 K. Our results suggest that this RbBaR(BO3)2 (R = Gd–Yb) family may be of further interest both experimentally and theoretically as highly geometrically frustrated magnets.