Abstract
The authors have compared the parallel (Hc2//) and perpendicular (Hc2 perpendicular to ) upper critical field of superconducting multilayers with strong and weak interlayer coupling (Pb/Cu, Pb/Ge). The temperature dependence of Hc2// reflects the expected dimensionality of the multilayers and can be interpreted in terms of the Takahashi-Tachiki proximity coupling model. In contrast with the strongly coupled Pb/Cu multilayers, weakly coupled Pb/Ge multilayers exhibit a strong thickness dependence of Hc2 perpendicular to . The electronic diffusion coefficient in Pb/Ge, obtained from Hc2 perpendicular to data, is not in agreement with the value calculated from the normal state resistivity. The disagreement reflects the highly inhomogeneous nature of the weakly coupled Pb/Ge multilayers.
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