Extended Van Hove singularity in a noncuprate layered superconductor Sr2RuO4

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

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Abstract

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
Volume76
Issue number16
Publication statusPublished - Apr 15 1996
Externally publishedYes

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Yokoya, T., Chainani, A., Takahashi, T., Katayama-Yoshida, H., Kasai, M., & Tokura, Y. (1996). Extended Van Hove singularity in a noncuprate layered superconductor Sr2RuO4. Physical Review Letters, 76(16), 3009-3012.