Abstract
The sharp forward electron–phonon (FEP) and impurity (FIS) scattering change the normal and superconducting properties significantly. The pseudo-gap like features are present in the density of states for ω<Ω, where Ω is the phonon frequency. The superconducting critical temperature T c , due to the FEP pairing, is linear with respect to the electron–phonon coupling constant. The FIS impurities are pair weakening for s- and d-wave pairing.
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