Observation of a van Hove Singularity in $B{i}_{2}S{r}_{2}C{a}_{1}C{u}_2{O}_{8+x}$ with Angle Resolved Photoemission

Abstract

We have performed high energy resolution angle-resolved photoemission studies of the normal state band structure of oxygen overdoped $B{i}_{2}S{r}_{2}C{a}_{1}C{u}_2{O}_{8+x}$. We find that there is an extended saddle point singularity in the density of states along $\Gamma -\bar{M}-Z$ direction. The data also indicate that there is an asymmetry in the Fermi surface for both the $\Gamma -\bar{M}-Z$ and perpendicular directions.

APS_Revtex. 28 pages, including 16 figures, available upon request. UW-Madison preprint#3

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