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

C.Quitmann; EPFL Switzerland); G. Margaritondo; H.Berger; Jian Ma; M.Onellion (Dept.of Phys. & ASC; P.Alm\'eras; R.J.Kelley; UW-Madison

arxiv: cond-mat/9405050 · v1 · pith:6R3YU5X6new · submitted 1994-05-18 · ❄️ cond-mat

Observation of a van Hove Singularity in Bi₂Sr₂Ca₁Cu₂O_(8+x) with Angle Resolved Photoemission

Jian Ma , C.Quitmann , R.J.Kelley , P.Alm\'eras , H.Berger , G. Margaritondo , M.Onellion (Dept.of Phys. & ASC , UW-Madison

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EPFL Switzerland)

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keywords gamma-photoemissionsingularitytherealongangleangle-resolvedasymmetry

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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 $\Gamma-\bar{M}-Z$ direction. The data also indicate that there is an asymmetry in the Fermi surface for both the $\Gamma-\bar{M}-Z$ and perpendicular directions.

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Observation of a van Hove Singularity in Bi₂Sr₂Ca₁Cu₂O_(8+x) with Angle Resolved Photoemission

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