Abstract
We have performed low-temperature high-resolution angle-resolved photoemission spectroscopy on a non-cuprate superconductor Sr 2RuO 4 ( T c ∼ 1 K) which has the same crystal structure as La 2CuO 4 but with RuO 2 layers replacing CuO 2. We found that Sr 2RuO 4 has an extended van-Hove singularity (VHS) close to E F(20 ± 2 meV) like high- T c cuprates, regardless of the character of the electronic states at E F, suggesting that the extended VHS is a general feature of a two-dimensional d-electron metal. This demands re-examination of the VHS scenario for the superconducting properties of cuprates, while T-linear resistivity seems to be consistent with this result.
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