Superconducting gap in the presence of bilayer splitting in underdoped Bi(Pb)2212

Details Superconducting gap in the presence of bilayer splitting in underdoped Bi(Pb)2212 Superconducting gap in the presence of bilayer splitting in underdoped Bi(Pb)2212

2002-04-25

arxiv.org/abs/cond-mat/0204557v2

Phys. Rev. B 66, 140509 (R) (2002)

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures (revtex4)

Scientific paper

10.1103/PhysRevB.66.140509

The clearly resolved bilayer splitting in ARPES spectra of the underdoped Pb-Bi2212 compound rises the question of how the bonding and antibonding sheets of the Fermi surface are gapped in the superconducting state. Here we compare the superconducting gaps for both split components and show that within the experimental uncertainties they are identical. By tuning the relative intensity of the bonding and antibonding bands using different excitation conditions we determine the precise {\bf k}-dependence of the leading edge gap. Significant deviations from the simple cos($k_{x}$)-cos($k_{y}$) gap function for the studied doping level are detected.

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