Bulk Electronic structure of Na${}_{0.35}$CoO${}_2$.1.3H${}_2$O

Abstract

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 $2p$ 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 $3d$ and O $2p$ derived states, in near agreement with band structure calculations.

arXiv comment4 pages 4 figures Revised text added reference

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