TY - JOUR
T1 - Angle-resolved photoemission study of the cobalt oxide superconductor NaxCoO2•yH2O
T2 - Observation of the fermi surface
AU - Shimojima, T.
AU - Ishizaka, K.
AU - Tsuda, S.
AU - Kiss, T.
AU - Yokoya, T.
AU - Chainani, A.
AU - Shin, S.
AU - Badica, P.
AU - Yamada, K.
AU - Togano, K.
PY - 2006
Y1 - 2006
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevLett.97.267003
DO - 10.1103/PhysRevLett.97.267003
M3 - Article
AN - SCOPUS:33846398899
SN - 0031-9007
VL - 97
JO - Physical Review Letters
JF - Physical Review Letters
IS - 26
M1 - 267003
ER -