The first exact calculation of (∂Tc∂c)c=0, the initial depression of the superconducting Tc, due to a small concentration, c, of magnetic impurities is presented. (∂Tc∂c)c=0 has been calculated from the pair-breaking regime (TKT_c⁰1) where the impurities are magnetic, to the pair-weakening regime (TKT_c⁰1). I find that (∂Tc∂c)c=0 can be expressed as the product of two universal functions f(λ₀) and g(TKT_c⁰), and that, in contrast to previous results, the maximum |(∂Tc∂c)c=0| occurs when T_c⁰=TK, thus resolving a long-standing experimental puzzle.
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Mark Jarrell (1988) studied this question.
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