Re-Entrant Superconductivity

摘要: The discovery of resistivity minima in metals at low temperatures dates back some fifty years, and yet the evolution a successful theoretical account basic anomaly continues to this date. Originally observations1 on Mg, Mo, Te, Co Pd yielded dramatic departures from expected variation $$\rho (T) = {\rho _0} + B{T^5},$$ (1) where BT5 represents electron scattering by thermally excited phonons temperatures. Impurity contributions are embedded residual constant ρo, which should be simple linear function impurity concentration according Matthiessen’s rule. By contrast, many was found have an additional term with evident divergence temperatures, whose origin attributed interesting many-body effect only 1964.