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Proceedings Paper

Extended van Hove singularity in noncuprate-layered perovskite superconductor Sr2RuO4
Author(s): Takashi Takahashi; T. Yokoya; A. Chainani; H. Katayama-Yoshida; M. Kasai; Yoshinori Tokura
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Paper Abstract

Low-temperature high-resolution angle-resolved photoemission spectroscopy (ARPES) has been performed on a non-cuprate superconductor Sr2RuO4 (Tc approximately 1 K), which has the same crystal structure as La2CuO4, but with RuO2 layers replacing CuO2. High-resolution ARPES spectra obtained along (Gamma) - Z line (Ru-O bonding direction) in Brillouin zone show the existence of an extended van-Hove singularity (VHS) close to EF (20 plus or minus 2 meV) like high-Tc cuprates, regardless of the character of the electronic states at EF, 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.

Paper Details

Date Published: 10 June 1996
PDF: 6 pages
Proc. SPIE 2696, Spectroscopic Studies of Superconductors, (10 June 1996); doi: 10.1117/12.241781
Show Author Affiliations
Takashi Takahashi, Tohoku Univ. (Japan)
T. Yokoya, Tohoku Univ. (Japan)
A. Chainani, Tohoku Univ. (Japan)
H. Katayama-Yoshida, Tohoku Univ. (Japan)
M. Kasai, Joint Research Ctr. for Atom Technology (Japan)
Yoshinori Tokura, Joint Research Ctr. for Atom Technology and Univ. of Tokyo (Japan)

Published in SPIE Proceedings Vol. 2696:
Spectroscopic Studies of Superconductors
Ivan Bozovic; Dirk van der Marel, Editor(s)

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