Extended van-Hove singularity in non-cuprate layered perovskite superconductor Sr{sub 2}RuO{sub 4}

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:549845

Takahashi, T; Yokoya, T; Chainani, A; Katayama-Yoshida, H ^[1]; Kasai, M ^[2]; Tokura, Y ^[2]

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1. Tohoku Univ., Sendai (Japan). Dept. of Physics
2. Joint Research Center for Atom Technology, Tsukuba (Japan)

Low-temperature high-resolution angle-resolved photoemission spectroscopy (ARPES) have been performed on a non-cuprate superconductor Sr{sub 2}RuO{sub 4} ({Tc} {approximately} 1 K), which has the same crystal structure as La{sub 2}CuO{sub 4}, but with RuO{sub 2} layers replacing CuO{sub 2}. High-resolution ARPES spectra obtained along {Lambda}-Z line (Ru-O bonding direction) in Brillouin zone show the existence of an extended van-Hove singularity (VHS) close to E{sub F} (20 {+-} 2 meV) like high-{Tc} cuprates, regardless of the character of the electronic states at E{sub 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.

• Sponsoring Organization: New Energy and Industrial Technology Development Organization, Tokyo (Japan)
• OSTI ID: 549845
• Report Number(s): CONF-960163--; ISBN 0-8194-2070-0
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BAND THEORY
ELECTRONIC STRUCTURE
PHOTOELECTRON SPECTROSCOPY
RUTHENIUM OXIDES
STRONTIUM OXIDES
SUPERCONDUCTIVITY
SUPERCONDUCTORS