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Vortex correlations in a fully frustrated two-dimensional superconducting network

We have investigated the vortex state in a superconducting dice network using the Bitter decoration technique at several magnetic frustrations f = ϕ/ϕ0 = 1/2 and 1/3. In contrast to other regular network geometries where the existence of a commensurate state was previouly demonstrated, no ordered state was observed in the dice network at f = 1/2 and the observed vortex-vortex correlation length is close to one lattice cell.