Gonzalez, Matías G.Noculak, VincentSharma, AmanFavre, VirgileSoh, Jian RuiMagrez, ArnaudBewley, RobertJeschke, Harald O.Reuther, JohannesRønnow, Henrik M.Iqbal, YasirŽivković, Ivica2025-01-242025-01-242025-01-242024-12-0110.1038/s41467-024-51362-12-s2.0-85201716837https://infoscience.epfl.ch/handle/20.500.14299/24355239168995Quantum spin liquids (QSLs) have become a key area of research in magnetism due to their remarkable properties, such as long-range entanglement, fractional excitations, and topologically protected phenomena. Recently, the search for QSLs has expanded into the three-dimensional world, despite the suppression of quantum fluctuations due to high dimensionality. A new candidate material, K2Ni2(SO4)3, belongs to the langbeinite family and consists of two interconnected trillium lattices. Although magnetically ordered, it exhibits a highly dynamical and correlated state. In this work, we combine inelastic neutron scattering measurements with density functional theory (DFT), pseudo-fermion functional renormalization group (PFFRG), and classical Monte Carlo (cMC) calculations to study the magnetic properties of K2Ni2(SO4)3, revealing a high level of agreement between experiment and theory. We further reveal the origin of the dynamical state in K2Ni2(SO4)3 to be centred around a magnetic network composed of tetrahedra on a trillium lattice.entruetext::journal::journal article::research article