Abstract
Pinning properties of Nb/CuMn multilayers with regular array of antidots have been studied at different temperatures in perpendicular magnetic field. The presence of antidots causes a sudden increase (jump) of the critical current at the liquid-helium lambda point (T = 2.18 K). The jump value is a function of magnetic field and sample anisotropy. The hypothesis of liquid helium wetting the antidots below 2.18 K, and then inducing a larger pinning efficiency, is put forward.