Abstract
The influence of Fermi surface anisotropy on the upper critical fieldH c2(T) of bulk type-II strong and weak coupling superconductors is investigated. It is found that anisotropic superconducting parameters can cause an enhancement ofH c2(0) of more than 30% and can thus explain the 30% difference between measured values ofH c2(0) and the prediction of weak coupling theories which recently has been found in the system Nb 75±x Pt 25∓x .
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