Angle-resolved photoemission spectroscopy was performed on a ruthenate superconductor Sr2RuO4 (Tc ∼ 1 K) which has the same crystal structure as La2CuO4, but with RuO2 layers replacing CuO2 layers. Sr2RuO4 shows an extended Van Hove singularity (VHS) at 20 ± 2 meV below EF just like the cuprates, regardless of the character of the electronic states at EF. This suggests that the extended VHS is a general feature of a two-dimensional correlated d-electron metal. The observed Fermi surface is in contrast to local-density-approximation calculations.
|Number of pages||4|
|Journal||Physical Review Letters|
|Publication status||Published - Apr 15 1996|
ASJC Scopus subject areas
- Physics and Astronomy(all)