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Normal and superconducting state in the presence of forward electron-phonon and impurity scattering |
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| Authors: | O.V. Danylenko O.V. Dolgov M.L. Kulic V. Oudovenko |
| Affiliation: | P.N. Lebedev Physical Institute, Moscow, Russia, RU Physikalisches Institut, Universit?t Bayreuth, 95440 Bayreuth, Germany, DE Max-Planck-Institut für Festk?rperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany, DE |
| Abstract: | 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 depends linearly on the E-P coupling constant 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. Received 1st July 1998 |
| Keywords: | PACS. 74.20.-z Theories and models of superconducting state - 74.25.-q General properties correlations between physical properties in normal and superconducting states |
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