Fermi Surface and Extended van Hove Singularity in the Noncuprate Superconductor Sr2RuO4
D. H. Lu, M. Schmidt, T. R. Cummins, S. Schuppler, F. Lichtenberg, J. G. Bednorz
DOI 10.1103/PhysRevLett.76.4845 · Physical Review Letters
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Abstract
We mapped the Fermi surface of the first copper-free layered perovskite superconductor, Sr2RuO4, by high-resolution (≈22meV) angle-resolved photoemission. Three bands cross the Fermi energy, consistent with band structure calculations; one around γ¯ and two around X¯. The highlight is the observation of an extended van Hove singularity located 17 meV below the Fermi level. It extends around M¯ for ≈0.2Å−1 along γ¯−M¯−γ¯ and X¯−M¯−X¯ in the projected Brillouin zone. This raises important questions related to the possible role of a van Hove singularity for oxide superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sr2RuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.93 | Pressure not reported | unknown |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure not reported | unknown |
| YBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 82 | Pressure not reported | unknown |
| Bi2Sr0.97Pr0.032CuO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 83 | Pressure not reported | unknown |
| Nd1.85Ce0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25 | Pressure not reported | unknown |
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