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Sc$_{2}$Ga$_{2}$CuO$_{7}$ (SGCO) crystallizes in a hexagonal structure (spacegroup: $P$$6$$_{3}/mmc$),\textcolor{black}{{} which can be seen as analternating stacking of single and double triangular layers. Combining neutron,x-ray, and resonant x-ray diffraction we establish that the single triangularlayers are mainly populated by non-magnetic Ga$^{3+}$ ions (85\% Ga and 15\%Cu), while the bi-layers have comparable population of Cu$^{2+}$ and Ga$^{3+}$}ions \textcolor{black}{(43\% Cu and 57\% Ga)}. Our susceptibility measurementsin the temperature range 1.8 - 400 K give no indication of any spin-freezing ormagnetic long-range order (LRO). We infer an effective paramagnetic moment$\mu_{eff}=1.79\pm0.09$ $\mu_{B}$ and a Curie-Weiss temperature $\theta_{CW}$of about $-44$ K, suggesting antiferromagnetic interactions between theCu$^{2+}$($S=1/2$) ions. Low-temperature neutron powder diffraction data showedno evidence for LRO down to 1.5 K. In our specific heat data as well, noanomalies were found down to 0.35 K, in the field range 0-140kOe.\textcolor{black}{{} The magnetic specific heat, $C_{m}$, exhibits a broadmaximum at around 2.5 K followed by a nearly power law $C$$_{m}$$\propto$$T$$^{\alpha}$ behavior at lower temperatures, with $\alpha$ increasing from}0.3\textcolor{black}{{} to} 1.9\textcolor{black}{{} as a function of field forfields upto 90 kOe and then remaining at 1.9 for fields upto 140 kOe. Ourresults point to a disordered ground state in SGCO. }

Sc_{2}Ga_{2}CuO_{7}: A possible Quantum spin liquid near the percolation threshold