Title: From clusters to crystals: Magnetism of otherwise nonmagnetic elements in two-dimension

Clusters, due to their reduced size and uncommon geometry, exhibit properties unknown in their bulk phase. However, most of the clusters lose their identity when assembled into periodic structures. A recent combined experimental and theoretical paper showed that a cluster composed of one uranium and six gold atoms, (UAu₆), both of which are nonmagnetic in the bulk, possesses a magnetic moment of 3 localized at the uranium site and originating from its f-orbitals. A systematic theoretical investigation is conducted to analyse the physical and magnetic properties of UAu₆ and its cousin sisters UAg₆, UCu₆ clusters. We have found that the geometry coordination as well as the magnetic signature of the cluster remains intact when assembled into a two-dimensional structure UX₄ (X: Au, Ag, Cu). The ground state magnetic configurations (FM or AFM) have been identified for 2D monolayers and their magnetic phase transitions have been studied under external perturbations.