${\mathrm{TmZn}}_2{\mathrm{GaO}}_5$ is a newly synthesized triangular lattice magnet that exhibits a unique quantum phase characterized by strong Ising anisotropy, a pseudodoublet crystal electric field ground state, and a low-energy gapped excitation at the $K$ point. Unlike its well-known counterparts, $\mathrm{TmMgGa}{\mathrm{O}}_4$ and $\mathrm{YbMgGa}{\mathrm{O}}_4$, this material crystallizes in a distinct hexagonal structure, leading to a platform for investigating frustrated magnetism. Magnetic susceptibility, heat capacity, and inelastic neutron scattering measurements confirm the absence of long-range magnetic order down to 50 mK, placing ${\mathrm{TmZn}}_2{\mathrm{GaO}}_5$ in a distinct region of the transverse-field Ising model phase diagram. Theoretical calculations based on spin-wave theory and mean-field modeling reproduce key experimental observations, reinforcing the material’s placement in a quantum disordered or multipolar state near a quantum critical point that separates it from the low-energy phase of $\mathrm{TmMgGa}{\mathrm{O}}_4$. These results highlight its potential for exploring quantum disordered states, anisotropic excitations, and exotic quantum phases in frustrated spin systems.

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• Frustrated magnetism
• Magnetic susceptibility
• Specific heat
• Inelastic neutron scattering