High-quality single crystals of ${\mathrm{Yb}}_3{\mathrm{Sc}}_2{\mathrm{Ga}}_3{\mathrm{O}}_{12}$ with a hyperkagome spin lattice were grown by using the floating-zone method. The magnetic susceptibility, specific heat and thermal conductivity were measured down to very low temperatures $(<100 \mathrm{mK})$ to characterize the magnetic properties and probe the nature of ground state. The experimental results demonstrate that the ground state is spin disordered one with effective 1/2 spin and antiferromagnetic coupling, pointing to a possible quantum spin liquid, although the clear characteristic behaviors of quantum spin liquid were not observed in these results. The specific heat data display broad peaklike feature that is likely caused by the short-range spin correlations. The ultralow-temperature thermal conductivity exhibits rather strong magnetic field dependence and zero residual term $({\kappa }_0/T)$, which indicates the scattering between phonons and magnetic excitations. In addition, both the specific heat and thermal conductivity data display some field-induced magnetic transitions.

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• Frustrated magnetism
• Thermal conductivity
• Single crystal materials
• Specific heat measurements