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Title: BSCCO superconductors : hole-like fermi surface and doping dependence of the gap function.

BSCCO superconductors : hole-like fermi surface and doping dependence of the gap function. 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 ({pi},{pi}), Then, the superconducting gap along the FS is precisely determined from ARPES measurements on over-doped and underdoped samples of Bi2212. As the doping decreases, the maximum gap increases, but the slope of the gap near the nodes decreases. Though consistent with d-wave symmetry, the gap with underdoping cannot be fit by the simple cos(k{sub x})-cos(k{sub 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 doping dependent.
Authors: ; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
OSTI Identifier:OSTI ID: 11940
Report Number(s):ANL/MSD/CP-99834
TRN: AH200119%%135
DOE Contract Number:W-31109-ENG-38
Resource Type:Conference
Resource Relation:Conference: Physics and Chemistry of Molecular and Oxide Superconductors International Conference, Stockholm (SE), 07/28/1999--08/02/1999; Other Information: PBD: 18 Aug 1999
Research Org:Argonne National Lab., IL (US)
Sponsoring Org:US Department of Energy (US)
Country of Publication:United States
Language:English
Subject: 36 MATERIALS SCIENCE; FERMI LEVEL; PENETRATION DEPTH; PHOTOEMISSION; HIGH-TC SUPERCONDUCTORS; BISMUTH OXIDES; STRONTIUM OXIDES; CALCIUM OXIDES; COPPER OXIDES; ENERGY GAP