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Phys. Rev. B 69, 180508(R) (2004) [4 pages]

Bulk electronic structure of Na0.35CoO2⋅1.3H2O

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A. Chainani1, T. Yokoya2, Y. Takata1, K. Tamasaku3, M. Taguchi1, T. Shimojima2, N. Kamakura1, K. Horiba1, S. Tsuda2, S. Shin1,2, D. Miwa3, Y. Nishino3, T. Ishikawa3, M. Yabashi4, K. Kobayashi4, H. Namatame5, M. Taniguchi5, K. Takada6,7, T. Sasaki6,7, H. Sakurai6, and E. Takayama-Muromachi6
1Soft X-ray Spectroscopy Lab, RIKEN/SPring-8, 1-1-1 Kouto, Mikazuki-cho, Sayo-gun, Hyogo 679-5148, Japan
2Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
3Coherent X-ray Optics Lab, RIKEN/SPring-8, 1-1-1 Kouto, Mikazuki-cho, Sayo-gun, Hyogo 679-5148, Japan
4JASRI/SPring-8, 1-1-1 Kouto, Mikazuki-cho, Sayo-gun, Hyogo 679-5198, Japan
5HiSOR, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima 739-8526, Japan
6National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Saitama 332-0012 Japan
7CREST, Japan Science and Technology Corporation, Japan

Received 5 December 2003; published 19 May 2004

High-energy (hν=5.95keV) synchrotron photoemission spectroscopy (PES) is used to study bulk electronic structure of Na0.35CoO2⋅1.3H2O, the layered superconductor. In contrast to three-dimensional doped Co oxides, Co 2p core level spectra show well-separated Co3+ and Co4+ ions. Cluster calculations suggest low-spin Co3+ and Co4+ character, and a moderate on-site Coulomb correlation energy Udd∼3–5.5eV. Photon dependent valence band PES identifies Co 3d and O 2p derived states, in near agreement with band-structure calculations.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.69.180508
DOI:
10.1103/PhysRevB.69.180508
PACS:
74.25.Jb, 74.25.Kc, 79.60.-i
 
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