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We combine experiments and numerical simulations to investigate the lowenergy states and the emergence of topological defects in an artificialcolloidal ice in the Cairo geometry. This type of geometry is characterized bya mixed coordination ($z$), with coexistence of both $z=3$ and $z=4$ vertices.We realize this particle ice by confining field tunable paramagnetic colloidalparticles within a lattice of topographic double wells at a one to one fillingusing optical tweezers. By raising the interaction strength via an appliedmagnetic field, we find that the ice rule breaks down, and positive monopoleswith charge $q=+2$ accumulate in the $z = 4$ vertices and are screened bynegative ones ($q=-1$) in the $z = 3$. The resulting, strongly coupled stateremains disordered. Further, via analysis of the mean chirality associated toeach pentagonal plaquette, we find that the disordered ensemble for thisgeometry is massively degenerate and it corresponds to a frustratedantiferrotoroid.

Ice Rule Breakdown and frustrated antiferrotoroidicity in an artificial colloidal Cairo ice