Abstract
We investigate the bulk superconducting electronic structure in optimally
doped YBa2Cu3O7-d (YBCO) using laser-excited angle-resolved photoemission
spectroscopy. The band dispersions with the dx2-y2 - wave like gap
opening are observed without being hindered by surface state and
CuO chain band due to bulk-sensitivity and/or matrix element effect
at hv = 6:994 eV. The momentum-dependence of the superconducting
gap exhibits a nonzero minimum of ~12 meV along the (0,0)-(pi,pi)
line. In addition,
the unusual suppression of the quasiparticle coherence is observed
at T/Tc > 0.5—0.7.
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