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$^{59}$Co NMR spectra in oriented powders of Na$_{0.35}$CoO$_{2}$ and in itshydrated superconducting phase (HSC) Na$_{0.35}$CoO$_{2}$,1.3H$_{2}$O reveal asingle electronic Co state with identical $T$ independent NMR shift tensor.These phases differ markedly from Na$_{0.7}$CoO$_{2}$, in which we resolve 3types of Co sites. The large T variation of their spin susceptibilities $\chi^{s}$ and the anisotropy of the orbital susceptibility $\chi ^{orb}$ allow usto conclude that charge disproportionation occurs, in a non magnetic Co$^{3+}$and two magnetic sites with about 0.3 and 0.7 holes in the $t_{2g}$ multiplet.The data are consistent with those for the single Co site in the anhydrous andHSC phase assuming the expected Co$^{3.65+}$ charge.Comment: 5 pages, 3 figures, accepted for publication in Phys. Rev. Let

physical review letters

<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi>Co</mml:mi><mml:mprescripts /><mml:none /><mml:mn>59</mml:mn></mml:mmultiscripts></mml:math>NMR Study of the Co States in Superconducting and Anhydrous Cobaltates

Co59NMR Study of the Co States in Superconducting and Anhydrous Cobaltates