Abstract
We have performed high-resolution angle-resolved photoemission spectroscopy of a non-cuprate layered superconductor Sr 2RuO 4 to study the electronic structure near the Fermi level ( E F). The result shows an extended van Hove singularity (vHs) along the RuO bonding direction just like the cuprate, regardless of the character of the electronic states at E F. This suggests that the extended vHs is a general electronic structure of a two dimensional correlated d-electron metal. We also have found that the observed Fermi surface topology (one electron-like Fermi surface sheet centered at Γ point and two hole-like ones centered at X point) is qualitatively different from the calculated Fermi surface topology (two electron-like Fermi sheets centered at Γ point and one hole-like one centered at X point) in the consequence of the existence of the vHs.
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