Angle-resolved photoemission study of the cobalt oxide superconductor NaxCoO2•yH2O

Observation of the fermi surface

T. Shimojima, K. Ishizaka, S. Tsuda, T. Kiss, Takayoshi Yokoya, A. Chainani, S. Shin, P. Badica, K. Yamada, K. Togano

Research output: Contribution to journalArticle

49 Citations (Scopus)

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 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.

Original languageEnglish
Article number267003
JournalPhysical Review Letters
Volume97
Issue number26
DOIs
Publication statusPublished - 2006

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cobalt oxides
Fermi surfaces
photoelectric emission
superconductivity
topology
electronic structure
spectroscopy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Angle-resolved photoemission study of the cobalt oxide superconductor NaxCoO2•yH2O : Observation of the fermi surface. / Shimojima, T.; Ishizaka, K.; Tsuda, S.; Kiss, T.; Yokoya, Takayoshi; Chainani, A.; Shin, S.; Badica, P.; Yamada, K.; Togano, K.

In: Physical Review Letters, Vol. 97, No. 26, 267003, 2006.

Research output: Contribution to journalArticle

Shimojima, T, Ishizaka, K, Tsuda, S, Kiss, T, Yokoya, T, Chainani, A, Shin, S, Badica, P, Yamada, K & Togano, K 2006, 'Angle-resolved photoemission study of the cobalt oxide superconductor NaxCoO2•yH2O: Observation of the fermi surface', Physical Review Letters, vol. 97, no. 26, 267003. https://doi.org/10.1103/PhysRevLett.97.267003
Shimojima, T. ; Ishizaka, K. ; Tsuda, S. ; Kiss, T. ; Yokoya, Takayoshi ; Chainani, A. ; Shin, S. ; Badica, P. ; Yamada, K. ; Togano, K. / Angle-resolved photoemission study of the cobalt oxide superconductor NaxCoO2•yH2O : Observation of the fermi surface. In: Physical Review Letters. 2006 ; Vol. 97, No. 26.
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AU - Kiss, T.

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AU - Shin, S.

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