Bulk Electronic structure of Na$_{0.35}$CoO$_{2}$.1.3H$_{2}$O

High-energy (h $ν$ = 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 $2 p$ 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 $_{d d} \sim$ 3-5.5 eV. Photon dependent valence band PES identifies Co $3 d$ and O $2 p$ derived states, in near agreement with band structure calculations.

Bulk Electronic structure of Na $_{0.35}$ CoO $_{2}$ .1.3H $_{2}$ O

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Bulk Electronic structure of Na $_{0.35}$ CoO $_{2}$ .1.3H $_{2}$ O

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Bulk Electronic structure of Na0.350.35​CoO22​.1.3H22​O

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Bulk Electronic structure of Na0.350.35​CoO22​.1.3H22​O

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Bulk Electronic structure of Na $_{0.35}$ CoO $_{2}$ .1.3H $_{2}$ O

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Bulk Electronic structure of Na $_{0.35}$ CoO $_{2}$ .1.3H $_{2}$ O

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