Fermi surface and extended van Hove singularity in the noncuprate superconductor Sr{sub 2}RuO{sub 4}
- Forschungszentrum Karlsruhe, INFP, P.O. Box 3640, D-76021 Karlsruhe (Germany)
- IBM Research Division, Zuerich Research Laboratory, CH-8803 Rueschlikon (Switzerland)
We mapped the Fermi surface of the first copper-free layered perovskite superconductor, Sr{sub 2}RuO{sub 4} by high-resolution ({approx_equal}22 meV) angle-resolved photoemission. Three bands cross the Fermi energy, consistent with band structure calculations; one around {Gamma} and two around {bar {ital X}}. The highlight is the observation of an extended van Hove singularity located 17meV below the Fermi level. It extends around {bar {ital M}} for {approx_equal}0.2 A{sup {minus}1} along {Gamma}-{bar {ital M}}-{Gamma} and {bar {ital X}}-{bar {ital M}}-{bar {ital X}} in the projected Brillouin zone. This raises important questions related to the possible role of a van Hove singularity for oxide superconductivity. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 286013
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 25 Vol. 76; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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