Normal and superconducting state in the presence of forward electron-phonon and impurity scattering

Details Normal and superconducting state in the presence of forward electron-phonon and impurity scattering Normal and superconducting state in the presence of forward electron-phonon and impurity scattering

1997-10-22

arxiv.org/abs/cond-mat/9710234v1

Physics

Condensed Matter

Superconductivity

10 pages with 1 PS figure, RevTex, submitted to Phys. Rev. B. Rapid Communication

Scientific paper

Impurities with the pronounced forward scattering (FS impurities) change analytical properties of the quasiparticle Green's function substantially compared to the isotropic scattering. By assuming that the superconducting pairing is due to the forward E-P scattering (FEP pairing) it is shown that the critical temperature of clean systems T_{c0} depends linearly on the E-P coupling constant \lambda and the isotope effect \alpha is small. The FS impurities make \alpha =1/2 in the dirty limit and affect in the same way the s- and d-wave FEP pairing. The FS impurities are pair-weakening in both pairing channels. The usual isotropic impurity scattering is pair-weakening for the s-wave and pair-breaking for the d-wave FEP pairing.

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