Angle-Resolved Photoemission Study of the Cobalt Oxide Superconductor NaxCoO2·yH2O: Observation of the Fermi Surface
T. Shimojima, K. Ishizaka, S. Tsuda, T. Kiss, T. Yokoya, A. Chainani, S. Shin, P. Badica, K. Yamada, K. Togano
DOI 10.1103/PhysRevLett.97.267003 · Physical Review Letters
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Abstract
The cobalt oxide superconductor NaxCoO2·yH2O is studied by angle-resolved photoemission spectroscopy. We report the Fermi surface (FS) topology and electronic structure near the Fermi level (EF) in the normal state of NaxCoO2·yH2O. Our result indicates the presence of the hexagonal FS centered at the Γ point, while the small pocket FSs along Γ−K direction are absent, similar to NaxCoO2. The top of the eg′ band, which is expected in band calculations to form the small pocket FSs, extends to within ∼30 meV below EF, closer to EF than in NaxCoO2. We discuss its possible role in superconductivity, comparing with other experimental and theoretical results.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NaxCoO2·yH2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4 | Pressure not reported | unknown |
| Na0.343(H3O)0.237CoO2·1.19H2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4 | Pressure not reported | unknown |
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