Physics – Condensed Matter – Materials Science
Scientific paper
2003-12-11
PRB 69, 180508(R), 2004
Physics
Condensed Matter
Materials Science
4 pages 4 figures Revised text added reference
Scientific paper
10.1103/PhysRevB.69.180508
High-energy (h$\nu$ = 5.95 keV) synchrotron Photoemission spectroscopy (PES) is used to study bulk electronic structure of Na$_{0.35}$CoO$_{2}$.1.3H$_{2}$O, the layered superconductor. In contrast to 3-dimensional doped Co oxides, Co $\it{2p}$ core level spectra show well-separated Co$^{3+}$ and Co$^{4+}$ ions. Cluster calculations suggest low spin Co$^{3+}$ and Co$^{4+}$ character, and a moderate on-site Coulomb correlation energy U$_{dd}\sim$3-5.5 eV. Photon dependent valence band PES identifies Co $\it{3d}$ and O $\it{2p}$ derived states, in near agreement with band structure calculations.
Chainani Ashish
Horiba Koji
Ishikawa Tadashi
Kamakura N.
Kobayashi Koji
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