Abstract
We use the gradient of the energy-integrated angle resolved photoemission (ARPES) intensity in order to define precisely the Fermi surface (FS) in BSCCO superconductors. We show that, independent of the photon energy, the FS is a hole barrel centered at (π, π). Then, the superconducting gap along the FS is precisely determined from ARPES measurements on overdoped and underdoped samples of Bi2212. As the do** decreases, the maximum gap increases, but the slope of the gap near the nodes decreases. Though consistent with d-wave symmetry, the gap with underdo** cannot be fit by the simple cos(k x) − cos(k y) form. A comparison of our ARPES results with available penetration depth data indicates that the renormalization of the linear T suppression of the superfluid density at low temperatures due to quasiparticle excitations around the d-wave nodes is large and do** dependent.
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Mesot, J., Norman, M.R., Ding, H. et al. BSCCO Superconductors: Hole-Like Fermi Surface and Do** Dependence of the Gap Function. Journal of Low Temperature Physics 117, 365–369 (1999). https://doi.org/10.1023/A:1022569616840
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DOI: https://doi.org/10.1023/A:1022569616840