Co59 NMR Study of the Co States in Superconducting and Anhydrous Cobaltates
I. R. Mukhamedshin, H. Alloul, G. Collin, N. Blanchard
DOI 10.1103/PhysRevLett.94.247602 · Physical Review Letters
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Abstract
Co59 NMR spectra in oriented powders of Na0.35CoO2 and in its hydrated superconducting (HSC) phase Na0.35CoO2,1.3H2O reveal a single electronic Co state with identical T independent NMR shift tensor. These phases differ markedly from Na0.7CoO2, in which we resolve three types of Co sites. The large T variation of their spin susceptibilities χs and the anisotropy of the orbital susceptibility χorb allow us to conclude that charge disproportionation occurs in a nonmagnetic Co3+ and two magnetic sites with about 0.3 and 0.7 holes in the t2g multiplet. The data are consistent with those for the single Co site in the anhydrous and HSC phase assuming the expected Co3.65+ charge.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Na0.35CoO2,1.3H2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.9 | Pressure not reported | unknown |
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