Abstract
Magnetization studies of critical currents J c (H⊥,T) and of the flux creep rate dlnM/dlnt have been carried out on low T c Pb/Ge multilayers, which can be used to model the superconducting properties of the layered high T c cuprates. By taking a proper Ge separator thickness a crossover between two different pinning regimes can be observed. This transition leads to an anomalous dependence of critical current and the flux creep rate on perpendicular magnetic field H ⊥ in Pb/Ge multilayers, while a single Pb film demonstrates a monotonous suppression of J c by H ⊥. These magnetization data fully confirm the anomalous behaviour of J c (H ⊥) previously found in Pb/Ge multilayers from measurements of transport critical current.
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