Zigzag magnetic order in the Kitaev spin-liquid candidate material <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>RuBr</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math> with a honeycomb lattice

The ruthenium halide $\alpha$-RuCl$_{3}$ is a promising candidate for Kitaev spin liquid. However, the microscopic model describing still debated partly because of lack analogue materials $\alpha$-RuCl$_{3}$, which prevents tracking electronic properties as functions controlled interaction parameters. Here, we report successful synthesis RuBr$_{3}$. material RuBr$_{3}$~possesses BiI$_3$-type structure (space group: $R\overline{3}$) where Ru$^{3+}$ form an ideal honeycomb lattice. Although RuBr$_{3}$ has negative Weiss temperature, it undergoes zigzag antiferromagnetic transition at $T_\mathrm{N}=34$ K, does $\alpha$-RuCl$_{3}$. Our analyses indicate that and non-Kitaev interactions can be modified in trihalides by changing ligand sites, provides new platform exploring liquids.