Extended van-Hove singularity in non-cuprate layered perovskite superconductor Sr{sub 2}RuO{sub 4}
- Tohoku Univ., Sendai (Japan). Dept. of Physics
- 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; TRN: 98:000469
- Resource Relation:
- Conference: Photonics West `96: conference on quantum well and superlattice physics VI, San Jose, CA (United States), 27 Jan - 2 Feb 1996; Other Information: PBD: 1996; Related Information: Is Part Of Spectroscopic studies of superconductors. Part B: Tunneling, photoelectron, and other spectra; Bozovic, I.; Marel, D. van der [eds.]; PB: 370 p.; Proceedings/SPIE, Volume 2696
- Country of Publication:
- United States
- Language:
- English
Similar Records
Fermi surface and extended van Hove singularity in the non-cuprate layered perovskite superconductor Sr{sub 2}RuO{sub 4}
Occupied and unoccupied electronic states in layered-perovskite superconductor without copper: Band dispersions, van Hove singularity and hole states in Sr{sub 2}RuO{sub 4}