Abstract
Experimental B c2( T) characteristics of two Nb 3Sn samples are analyzed using a full strong coupling theory of B c2( T) which also includes anisotropy effects. The analysis requires a rather pronounced anisotropy of the electron-phonon interaction and of the Fermi velocity and Pauli paramagnetic limiting in order to reproduce the experimental B c2( T) data over the whole temperature range. The analysis of the second, dirty sample shows that a pronounced change in the electron density of states at the Fermi energy is required together with reduction of the Fermi velocity anisotropy to reproduce the experimental B c2( T) data. The analysis does not require any contributions from spin-orbit scattering processes to achieve an excellent match between theory and experiment.
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