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Observation of a van Hove Singularity in $Bi_{2}Sr_{2}Ca_{1}Cu_{2}O_{8+x}$ with Angle Resolved Photoemission

Jian Ma·C. Quitmann·R. J. Kelley·P. Alméras·H. Berger·G. Margaritondo·M. Onellion
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Abstract

We have performed high energy resolution angle-resolved photoemission studies of the normal state band structure of oxygen overdoped $Bi_{2}Sr_{2}Ca_{1}Cu_{2}O_{8+x}$. We find that there is an extended saddle point singularity in the density of states along $Γ-\bar{M}-Z$ direction. The data also indicate that there is an asymmetry in the Fermi surface for both the $Γ-\bar{M}-Z$ and perpendicular directions.

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Jian Ma, C. Quitmann, R. J. Kelley, P. Alméras, H. Berger, G. Margaritondo, M. Onellion. 1994-05-18. Observation of a van Hove Singularity in $Bi_{2}Sr_{2}Ca_{1}Cu_{2}O_{8+x}$ with Angle Resolved Photoemission. https://doi.org/10.1103/physrevb.51.3832

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