Topological asymmetry in the damping-pairing contribution of electron-boson scattering

¹ Institute of Electronic Structure and Laser Foundation for Research and Technology, Hellas, P.O. Box 1527, Heraklion, Crete 71110, Greece
² DPMC, Université de Genève, 24 quai E. Ansermet, CH-1211 Genève 4, Switzerland

Received: 14 April 1997
Accepted: 14 July 1997

Abstract

We make a harmonic analysis of the pairing and damping contribution of a finite k range isotropic electron-phonon (or other boson) scattering in an anisotropic two-dimensional electronic system. We show that the pairing contribution of the anisotropic part of the electronic system can be much larger than its damping contribution enhancing significantly T_c. The higher is the order of the harmonic of the electronic anisotropy, the higher can be the asymmetry in its damping-pairing contribution. This could explain the puzzle of a much broader quasiparticle peak in the n-doped than in the p-doped cuprates, their smaller T_c's being also attributed to larger damping effects.