59Co NMR study of the Co states in superconducting and anhydrous cobaltates

Details 59Co NMR study of the Co states in superconducting and anhydrous cobaltates 59Co NMR study of the Co states in superconducting and anhydrous cobaltates

2005-05-16

arxiv.org/abs/cond-mat/0505380v1

Phys. Rev. Lett. 94, 247602 (2005)

Physics

Condensed Matter

Superconductivity

5 pages, 3 figures, accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.94.247602

$^{59}$Co NMR spectra in oriented powders of Na$_{0.35}$CoO$_{2}$ and in its hydrated superconducting phase (HSC) Na$_{0.35}$CoO$_{2}$,1.3H$_{2}$O reveal a single electronic Co state with identical $T$ independent NMR shift tensor. These phases differ markedly from Na$_{0.7}$CoO$_{2}$, in which we resolve 3 types of Co sites. The large T variation of their spin susceptibilities $\chi ^{s}$ and the anisotropy of the orbital susceptibility $\chi ^{orb}$ allow us to 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 and HSC phase assuming the expected Co$^{3.65+}$ charge.

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