Vortex pinning and rectification effect in a nanostructured superconducting film with a square array of antidot triplets
He An1, Xue Cun2, †, Zhou Youhe3, 4
       

(color online) (a) The voltage versus time response (bottom) under an ac current made of square pulses with amplitude (top). The inset shows the enlargement of voltage oscillation vs. time. (b) Normalized dc voltage of the sample versus current amplitude at H = 0.6.