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Critical currents and flux creep in low Tc Pb/Ge multilayers

✍ Scribed by K. Temst; M. Baert; E. Rosseel; V.V. Moshchalkov; C. Van Haesendonck; Y. Bruynseraede; V.V. Metlushko; G. Güntherodt

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
139 KB
Volume
194-196
Category
Article
ISSN
0921-4526

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✦ Synopsis

Magnetization studies of critical currents J~(H±,T) and of the flux creep rate dlnM/dlnt have been carried out on low T~ Pb/Ge multilayers, which can be used to model the superconducting properties of the layered high Tc 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~ by H±. These magnetization data fully confirm the anomalous behaviour of Jc(H±) previously found in Pb/Ge multilayers from measurements of transport critical current.

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