Enhanced Coherence of Antinodal Quasiparticles in a Dirty d-wave Superconductor

Details Enhanced Coherence of Antinodal Quasiparticles in a Dirty d-wave Superconductor Enhanced Coherence of Antinodal Quasiparticles in a Dirty d-wave Superconductor

2005-04-11

arxiv.org/abs/cond-mat/0504240v1

Phys. Rev. B 72, 214517 (2005) (5 pages)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures, submitted

Scientific paper

10.1103/PhysRevB.72.214517

Recent ARPES experiments show a narrow quasiparticle peak at the gap edge along the antinodal [1,0]-direction for the overdoped cuprate superconductors. We show that within weak coupling BCS theory for a d-wave superconductor the s-wave single-impurity scattering cross section vanishes for energies of the gap edge. This coherence effect occurs through multiple scattering off the impurity. For small impurity concentrations the spectral function has a pronounced increase of the (scattering) lifetime for antinodal quasiparticles but shows a very broad peak in the nodal direction, in qualitative agreement with experiment and in strong contrast to the behavior observed in underdoped cuprates.

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