s- and d-wave symmetries in nonadiabatic theory of superconductivity

Citation
P. Paci et al., s- and d-wave symmetries in nonadiabatic theory of superconductivity, INT J MOD B, 14(25-27), 2000, pp. 2982-2987
Citations number
9
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
ISSN journal
02179792 → ACNP
Volume
14
Issue
25-27
Year of publication
2000
Pages
2982 - 2987
Database
ISI
SICI code
0217-9792(20001030)14:25-27<2982:SADSIN>2.0.ZU;2-V
Abstract
High-T-c superconductors have Fermi energies E-F much smaller than conventi onal metals comparable to phonon frequencies. In such a situation nonadiaba tic effects are important. A. generalization of Eliashberg theory in the no nadiabatic regime has previously been shown to reproduce some anomalous fea tures of the high-T-c superconductors as for istance the enhancement of T-c or the isotopic effects on T-c and m*. In this contribution we address the issue of the symmetry of the gap in the context of nonadiabatic supercondu ctivity. We show that vertex corrections have a momentum structure which fa vours d-wave superconductivity when forward scattering is predominant. An a dditional increase of T-c is also found.