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 language | English |
|---|---|
| Pages (from-to) | 507-512 |
| Number of pages | 6 |
| Journal | Proceedings of SPIE - The International Society for Optical Engineering |
| Volume | 2696 |
| Issue number | 2/- |
| Publication status | Published - 1996 Dec 1 |
| Event | Spectroscopic Studies of Superconductors. Part 2 (of 2) - San Jose, CA, USA Duration: 1996 Jan 29 → 1996 Feb 1 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering