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

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.

4 pages, 3 figures, submitted

References in corpus (3)

• Angle-resolved photoemission spectroscopy of the cuprate superconductors
• Fermi Surface and Quasiparticle Excitations of overdoped Tl2Ba2CuO6+d by ARPES
• Elastic forward scattering in the cuprate superconducting state

Cited by in corpus (4)

• Tl2Ba2CuO6+d Brings Spectroscopic Probes Deep Into the Overdoped Regime of the High-Tc Cuprates
• Competing ferromagnetism in high temperature copper oxide superconductors
• Effects of inhomogeneities and thermal fluctuations on the spectral function of a model d-wave superconductor
• High Temperature Superconductivity Dominated by Inner Underdoped CuO${}_2$ Planes in Quadruple-Layer Cuprate (Cu,C)Ba${}_2$Ca${}_3$Cu${}_4$O${}_{11+\delta }$