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Continuous spin excitations are widely recognized as one of the hallmarks ofnovel spin states in quantum magnets, such as quantum spin liquids (QSLs).Here, we report the observation of such kind of excitations in K2Ni2(SO4)3,which consists of two sets of intersected spin-1 Ni2+ trillium lattices. Ourinelastic neutron scattering measurement on single crystals clearly shows adominant excitation continuum, which exhibits a distinct temperature-dependentbehavior from that of spin waves, and is rooted in strong quantum spinfluctuations. Further using the self-consistent-gaussian-approximation method,we determined the fourth- and fifth-nearest neighbor exchange interactions aredominant. These two bonds together form a unique three-dimensional network ofcorner-sharing tetrahedra, which we name as ''hyper-trillium'' lattice. Ourresults provide direct evidence for the existence of QSL features inK2Ni2(SO4)3 and highlight the potential for the hyper-trillium lattice to hostfrustrated quantum magnetism.

Continuous spin excitations in the three-dimensional frustrated magnet K2Ni2(SO4)3