Tuning superconductivity in topological materials has been identified as a promising pathway for achieving topological superconductivity, which could accelerate advancements in topological quantum computation. Ternary transition-metal chalcogenides ${ABX}_4$ (where $A/B$ = Zr, Hf, or Ti; $X$ = Te) have been theoretically predicted to be candidates for two-dimensional (2D) topological insulators. In this study we systematically investigate the crystal structure, electronic band properties, and pressure effects of one member of this family, namely, $\mathrm{ZrTiT}{\mathrm{e}}_4$. Our single-crystal x-ray diffraction studies reveal that $\mathrm{ZrTiT}{\mathrm{e}}_4$ adopts a trigonal structure with space group $P\overline{3}m1$ (no. 164), rather than the previously reported monoclinic ($P2/m$) structure. Band structure calculations, complemented by angle-resolved photoemission spectroscopy measurements, indicate that $\mathrm{ZrTiT}{\mathrm{e}}_4$ exhibits a topological semimetal nature. Notably, the application of high pressure induces superconductivity, with a maximum transition temperature ($T_{\mathrm{c}}$) of approximately 5.6 K at pressures around 11–14 GPa. Intriguingly, in the optimal pressure region of the dome-shaped phase diagram, the normal-state resistance shows the highest values, and a nearly linear temperature dependence of resistance is observed above $T_{\mathrm{c}}$. Overall, our results establish the ${ABX}_4$ family as a promising candidate for exploring the interaction between the nontrivial band topology and superconductivity.

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• Critical phenomena
• Fermi surface
• Pressure effects
• Structural properties
• Superconductivity
• Surface states
• Transition metal dichalcogenides
• van der Waals systems
• Angle-resolved photoemission spectroscopy
• Density functional calculations
• X-ray diffraction