ISSN:
1573-7357
Keywords:
74.7e.−h
;
74.25. Kc
;
71.27.+a
;
63.20. Kr
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract We investigate the effect of electronic correlations on the phonon-mediated part of the pair interaction by including the effect of an exchange interaction U between the electrons in the calculation of the phonon frequencies and the electron-phonon vertices. We employ two RPA models: the first, consisting of a direct Coulomb interaction in addition to U, leads to softer phonons and an enhanced attractive s-wave phonon-induced electron-electron interaction while the second, a pure Hubbard model, yields the opposite effect. The weak-coupling selfconsistency equation for the order parameter in the 2D first Brillouin zone is solved for a tight-binding band. The change of Tc arises primarily from the change of the phonon frequencies rather than from the vertex renormalization.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00752334
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