A previously unreported triangular lattice (TL) antiferromagnet, $\mathrm{TmZnGa}{\mathrm{O}}_4$, was synthesized as single crystals, and its crystal structure, magnetic susceptibilities, and specific heat were reported. Its crystal structure is isomorphic to that of the transverse-field Ising antiferromagnet $\mathrm{TmMgGa}{\mathrm{O}}_4$, with $\mathrm{T}{\mathrm{m}}^{3+}$ ions located in the TLs, separated by a nonmagnetic bilayer composed mainly of $\mathrm{G}{\mathrm{a}}^{3+}$ and $\mathrm{Z}{\mathrm{n}}^{2+}$ ions. The magnetic susceptibilities indicate the dominating antiferromagnetic interactions. The magnetization curves ($M\text{−}H$) exhibit strong easy-$c$-axis anisotropy, with a clear one-third magnetic plateau emerging, consistent with a field-induced up-up-down $\left(\uparrow \uparrow \downarrow \right)$ spin configuration. Instead of forming a conventional long-range magnetic order, the system exhibits two broad humps at 0.11 K and 2.81 K in zero-field specific heat measurements, revealing dominant strong spin fluctuations and pointing to potential relevance to Berezinskii-Kosterlitz-Thouless physics. The above results reveal its future interest in exploring exotic quantum spin states in $\mathrm{TmZnGa}{\mathrm{O}}_4$.

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• Magnetic susceptibility
• Specific heat