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The depinning current Ic versus applied magnetic field B close to thetransition temperature Tc of Nb thin films with randomly diluted triangulararrays of antidots is investigated. % Our experiments confirm essentialfeatures in Ic(B) as predicted by Reichhardt and Olson Reichhardt [Phys.Rev. B76, 094512 (2007)]. % We show that, by introducing disorder into periodicpinning arrays, Ic can be enhanced. % In particular, for arrays with fixeddensity n_p of antidots, an increase in dilution Pd induces an increase in Icand decrease of the flux-flow voltage for B>Bp=n_p Phi_0.

Suppression of dissipation in Nb thin films with triangular antidot arrays by random removal of pinning sites