Crystal growth, crystal structure and anisotropic magnetic properties of KBaR(BO3)2 (R = Y, Gd, Tb, Dy, Ho, Tm, Yb and Lu) triangular lattice materials

• Published in: Journal of magnetism and magnetic materials 2019-02, Vol.472 (C), p.104-110
• Main Authors: Guo, Shu, Kong, Tai, Cevallos, F. Alex, Stolze, Karoline, Cava, R.J.
• Format: Article
• Language: English
• Subjects: Flux crystal growth; Geometric magnetic frustration; Materials Science; Physics; Rare earth borate
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2018.10.037

•Well-shaped KBaR(BO3)2 (R = Gd, Tb, Dy, Ho, Tm and Yb) single crystals were grown by flux method.•The anisotropic magnetic properties of KBaR(BO3)2 (R = Gd, Tb, Dy, Ho, Tm and Yb) were studied for the first time.•A good model with R-based triangular lattice was studied here. Crystals of the KBaR(BO3)2 (R = Y, Gd, Tb, Dy, Ho, Tm, Yb and Lu) rare earth borates were grown by spontaneous nucleation from a KF-B2O3 flux. The crystals obtained were typically well-developed hexagonal plates about 1 mm in large dimension. The crystals were used to study the anisotropic temperature and field dependent magnetization of the materials, which are based on ideal triangular planes of magnetic rare earths. All structures were refined in space group R3-m by single-crystal X-ray diffraction, and in addition to the equilateral triangular rare earth plane lattice, displayed K/Ba site occupancy disorder. All magnetic compounds reveal dominantly antiferromagnetic spin interactions with no magnetic ordering above 1.8 K. With the exception of KBaGd(BO3)2, magnetic anisotropy was observed for other five magnetic members of the family. The results suggest that KBaR(BO3)2 crystals may be of further interest for investigating the magnetic properties of rare earth ions on a triangular lattice.