https://doi.org/10.1007/s100510050757
Normal and superconducting state in the presence of forward electron-phonon and impurity scattering
1
P.N. Lebedev Physical Institute, Moscow, Russia
2
Institut für Theoretische Physik, Universität Tübingen, Germany
3
Physikalisches Institut, Universität Bayreuth, 95440 Bayreuth,
Germany
4
Max-Planck-Institut für Festkörperforschung,
Heisenbergstrasse 1, 70569 Stuttgart, Germany
5
Joint Institute for Nuclear Research, 141980 Dubna, Russia
Received:
1
July
1998
Published online: 15 May 1999
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 Tc0 depends linearly on the E-P coupling constant
λ and the isotope effect 
is very small. Impurities with
the pronounced forward scattering (FS impurities) change analytical
properties of the quasiparticle Green's function substantially compared to
the case of the isotropic scattering. The FS impurities are pair-breaking
and affect in the same way s- and d-wave
FEP pairing making 
in the dirty limit.The usual isotropic impurity scattering is
pair-weakening for s-wave and pair-breaking for the d-wave
FEP
pairing.
PACS: 74.20.-z – Theories and models of superconducting state / 74.25.-q – General properties; correlations between physical properties in normal and superconducting states
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1999
