Abstract
We solve the Eliashberg equations for models based on the electron-phonon pairing mechanism. The coupling parameters are chosen to be consistent with the Fermi surface of the high-To oxides as obtained in band calculations. The attractive coupling parameters are taken to be similar to the calculated electron-phonon interaction and the repulsive ones are assumed to be of Coulomb type. We show that both s- and d-wave solutions exist provided a repulsive interaction is included in the model. The key feature allowing for a near degeneracy of these solutions is that the electron-phonon processes are dominated by forward scattering (i.e. the attractive coupling between distant parts of the FS is small). We discuss the conditions for existence and stability as well as physical consequences for both types of solutions.
Original language | English |
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Pages (from-to) | 919-920 |
Number of pages | 2 |
Journal | Czechoslovak Journal of Physics |
Volume | 46 |
Issue number | SUPPL. 2 |
DOIs | |
State | Published - 1996 |