On a least upper bound Tc of superconductors with paramagnetic impurities |
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Authors: | M Ashraf JP Carbotte |
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Institution: | Physics Department, McMaster University, Hamilton, Ontario, Canada L8S 4M1 |
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Abstract: | We have obtained a least upper bound, , on the critical temperature Tc of an isotropic superconductor with paramagnetic impurities described by the scattering matrix t for fixed values of μ1. We have also obtained the corresponding optimal spectrum . The numerical results for the functions are presented for and 0.16 in the form of universal curves representing as functions of the reduced impurity concentration . We have also established an upper limit to the reduced critical concentration for an arbitrary shape of α2F(ω)1. |
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