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

研究成果査読

55 被引用数 (Scopus)

抄録

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 Î" point, while the small pocket FSs along Î"-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 30meV below EF, closer to EF than in NaxCoO2. We discuss its possible role in superconductivity, comparing with other experimental and theoretical results.

本文言語English
論文番号267003
ジャーナルPhysical Review Letters
97
26
DOI
出版ステータスPublished - 2006

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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