Suppression of quantum metallic state in disordered Ta thin films with the addition of artificial periodic pinning centers

We studied the low temperature transport properties of perforated superconducting Ta films with periodic triangular array of holes to investigate the role of pinning effect on superconductor-insulator transition. Magnetic field and temperature dependence of transport characteristics in 7 perforated Ta thin film samples with uniform thickness but different densities of holes are investigated and compared with a reference sample without holes. High density artificial periodic pinning centers increase activation energies for motion of vortices and induce cusp-like magnetic field dependence of resistance due to commensurate matching effect of interstitial vortices between holes as well as trapped vortices insides holes. As hole density increases, matching effects is observed up to higher field. Besides Resistance of field cooling decreases as Arrhenius form of thermal activated model up to higher magnetic field and, zero-temperature limit metallic state is more suppressed.