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

Abstract

${}^{59}$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.

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

References in corpus (3)

• Charge Disproportionation and Spin Ordering Tendencies in Na(x)CoO2
• Series of Bulk Magnetic Phase Transitions in NaxCoO2: a muSR study
• Spin-Dynamics in the Carrier-Doped $S=1/2$ Triangular-Lattice of Na${}_x$CoO${}_2$-yH${}_2$O

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