Extended van hove singularity in a noncuprate layered superconductor sr2RuO4

T. Yokoya, A. Chainani, T. Takahashi, H. Katayama-Yoshida, M. Kasai, Y. Tokura

Research output: Contribution to journalArticlepeer-review

100 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)3009-3012
Number of pages4
JournalPhysical Review Letters
Issue number16
Publication statusPublished - 1996 Apr 15


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