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Single crystals of a honeycomb lattice antiferromagnet, Tb$_2$Ir$_3$Ga$_9$were synthesized, and the physical properties have been studied. Frommagnetometry, a long-range antiferromagnetic ordering at $\approx$12.5 K withhighly anisotropic magnetic behavior was found. Neutron powder diffractionconfirms that the Tb spins lie along the $\va $-axis, parallel to the shortestTb-Tb contact. Two field-induced spin-flip transitions are observed when thefield is applied parallel to this axis, separated by a plateau correspondingroughly to M$\approx$M$_{\rm{s}}$/2. Transport measurements show theresistivity to be metallic with a discontinuity at the onset of N\'eel order.Heat capacity shows a $\lambda$-like transition confirming the bulk nature ofthe magnetism. We propose a phenomenological spin-Hamiltonian that describesthe magnetization plateau as a result of strong Ising character arising from aquasidoublet ground state of the Tb$^{3+}$ ion in a site of \textit{C$_s$}symmetry and expressing a significant bond dependent anisotropy.

Steplike metamagnetic transitions in a honeycomb lattice antiferromagnet Tb$_2$Ir$_3$Ga$_9$