Observation of a van Hove singularity in Bi2Sr2CaCu2O8+x with angle-resolved photoemission

Abstract
We have performed high-energy-resolution angle-resolved photoemission studies of the normal-state band structure of oxygen-overdoped Bi2 Sr2 CaCu2 O8+x. We find that there is an extended saddle-point singularity in the density of states along the Γ-M¯-Z direction. The data also indicate that there is an asymmetry in the Fermi surface for both the Γ-M¯-Z and perpendicular directions.
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