Enhanced coherence of antinodal quasiparticles in a dirty d-wave superconductor
Katsunori Wakabayashi, T. M. Rice, Manfred Sigrist
DOI 10.1103/PhysRevB.72.214517 · Physical Review B
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Abstract
Recent angle-resolved photoelectron spectroscopy 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 ω=Δ (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 the above-mentioned experiment and in strong contrast to the behavior observed in underdoped cuprates.
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