Ubiquitous antinodal quasiparticles and deviation from simple d-wave form in underdoped Bi-2212
arXiv:1405.4961
Abstract
The momentum dependence of the superconducting gap in the cuprates has been debated, with most experiments reporting a deviation from a simple form in the underdoped regime and a few experiments claiming that a simple form persists down to the lowest dopings. We affirm that the superconducting gap function in sufficiently underdoped BiSrCaCuO (Bi-2212) deviates from a simple \textit{d}-wave form near the antinode. This is observed in samples where doping is controlled only by oxygen annealing, in contrast to claims that this effect is only seen in cation-substituted samples. Moreover, a quasiparticle peak is present at the antinode down to p0.08, refuting claims that a deviation from a simple \textit{d}-wave form is a data analysis artifact stemming from difficulty in assessing a gap in the absence of a quasiparticle.
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