http://hdl.handle.net/20.500.12128/7393
Title: | Phonon-induced and phonon-free superconductivity in correlated systems : Eliashberg equations for the two-dimensional Hubbard model |
Authors: | Mierzejewski, Marcin Zieliński, Janusz Entel, P. |
Keywords: | silnie skorelowane systemy elektronowe; ciężkie fermiony; nadprzewodnictwo; model Hubbarda; fizyka fazy skondensowanej |
Issue Date: | 1998 |
Citation: | Acta Physica Polonica B, Vol. 29, no. 12 (1998), s. 3907-3924 |
Abstract: | The problem of phonon-induced and phonon-free superconductivity in the two-dimensional Hubbard model has been addressed. We have generalized the Eliashberg equations to account for both on-site and intersite pairing and consider the electron–electron and electron-phonon channel on an equal footing. This approach allows for the discussion of pairing and depairing properties of the local repulsive interaction. We demonstrate the possibility of cooperation between electron-phonon and electron–electron interaction in the stabilization of the d-wave superconductivity, in particular close to the experimental value of optimal doping ( ≃ 0.15). We have also discussed the problem of phonon-induced superconductivity in the two-dimensional Hubbard model close to the metal-insulator transition. Here, the Coulomb correlations have been incorporated within the Hubbard I approximation whereas the superconductivity is treated by the Eliashberg scheme. The results support the view that a d-wave component dominates in the gap function. |
URI: | http://hdl.handle.net/20.500.12128/7393 |
ISSN: | 0587-4254 |
Appears in Collections: | Artykuły (WNŚiT) |
File | Description | Size | Format | |
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Mierzejewski_Phonon_induced_and_phonon_free.pdf | 461,24 kB | Adobe PDF | View/Open |
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