Glassy dynamics of Josephson arrays on a dice lattice

In this letter we study the phase diagram and the approach to the equilibrium of Josephson junction arrays on a dice lattice for two different values of the magnetic frustration (f = 1/2, 1/3). In both cases, the array undergoes a Berezinskii-Kosterlitz-Thouless-like phase transition. For the fully frustrated array, f = 1/2, we find evidence of a glassy behavior although the system has no disorder. For comparison we study the dynamics of the array at a different value of frustration ( f = 1/3) and find no trace of glassy dynamics.