Extended van Hove singularity in noncuprate-layered perovskite superconductor Sr2RuO4

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

Research output: Contribution to journalConference articlepeer-review

Abstract

Low-temperature high-resolution angle-resolved photoemission spectroscopy (ARPES) has been performed on a non-cuprate superconductor Sr 2RuO 4 (T c approximately 1 K), which has the same crystal structure as La 2CuO 4, but with RuO 2 layers replacing CuO 2. High-resolution ARPES spectra obtained along Γ - Z line (Ru-O bonding direction) in Brillouin zone show the existence of an extended van-Hove singularity (VHS) close to E F (20 plus or minus 2 meV) like high-T c cuprates, regardless of the character of the electronic states at E F, suggesting that an extended VHS is a general feature of correlated two-dimensional d - electron metals. This requests re-examination of the VHS scenario for superconducting properties of cuprates, while the observed T-linear resistivity seems to be consistent with the present result.

Original languageEnglish
Pages (from-to)507-512
Number of pages6
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume2696
Issue number2/-
Publication statusPublished - 1996 Dec 1
EventSpectroscopic Studies of Superconductors. Part 2 (of 2) - San Jose, CA, USA
Duration: 1996 Jan 291996 Feb 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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