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

Katsunori Wakabayashi·T. M. Rice·Manfred Sigrist
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Abstract

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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Katsunori Wakabayashi, T. M. Rice, Manfred Sigrist. 2005-04-11. Enhanced Coherence of Antinodal Quasiparticles in a Dirty d-wave Superconductor. https://doi.org/10.1103/physrevb.72.214517

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