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Angle-resolved photoemission study of cobalt oxide superconductor NaxCoO2.yH2O : Observation of the Fermi surface

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arxiv cond-mat/0606424 v1 pith:ZRLXM7PA submitted 2006-06-15 cond-mat.supr-con

T. Shimojima , K. Ishizaka , S. Tsuda , T. Kiss , T. Yokoya , A. Chainani , S. Shin , P. Badica
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K. Yamada K. Togano
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classification cond-mat.supr-con
keywords naxcoo2fermiyh2oangle-resolvedbandcobaltoxidephotoemission
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Cobalt oxide superconductor NaxCoO2.yH2O is studied by angle-resolved photoemission spectroscopy (ARPES). We report the Fermi surface (FS) topology and electronic structure near the Fermi level (EF) of NaxCoO2.yH2O. Our result indicates the presence of the hexagonal FS centered at G point, while the small pocket FSs along G-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 20 - 50 meV below EF, more closer to EF than in NaxCoO2. We discuss its possible role in superconductivity, comparing with other experimental and theoretical results.

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