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The interplay between competing degrees of freedom can stabilize non-trivialmagnetic states in correlated electron materials. Frustration-induced strongquantum fluctuations can evade long-range magnetic ordering leading to exoticquantum states such as spin liquids in two-dimensional spin-lattices such astriangular and kagome structures. However, the experimental realization ofdynamic and correlated quantum states is rare in three-dimensional (3D)frustrated magnets wherein quantum fluctuations are less prominent. Herein, wereport the crystal structure, magnetic susceptibility, electron spin resonance(ESR) and specific heat studies accompanied by crystal electric field (CEF)calculations on a 3D frustrated magnet Yb3Sc2Ga3O12. In this material, Yb3+ions form a three-dimensional network of corner-sharing triangles known ashyperkagome lattice without any detectable anti-site disorder. Our resultsreveal a low energy state with Jeff = 1/2 degrees of freedom in the Kramersdoublet state. The zero field-cooled and field cooled magnetic susceptibilitytaken in 0.001 T rules out the presence of spin-freezing down to 1.8K. TheCurie-Weiss (CW) fit to low-T susceptibility data yields a small and negativeCW temperature indicating the presence of a weak antiferromagnetic interactionbetween Jeff = 1/2 (Yb3+) moments. The Yb-ESR displays a broad line ofnon-Lorentzian shape that suggests considerable magnetic anisotropy inYb3Sc2Ga3O12. The CEF calculations suggest that the ground state is wellseparated from the excited states, which are in good agreement withexperimental results. The absence of long-range magnetic ordering indicates adynamic liquid-like ground state at least down to 130 mK. Furthermore, zerofield specific heat shows a broad maximum around 200 mK suggesting the presenceof short-range spin correlations in this 3D frustrated antiferromagnet.

Magnetic properties of a spin-orbit entangled Jeff=1/2 three-dimensional frustrated rare-earth hyperkagome