O17 NMR Studies of a Triangular-Lattice Superconductor NaxCoO2·yH2O
F. L. Ning, T. Imai
DOI 10.1103/PhysRevLett.94.227004 · Physical Review Letters
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Abstract
We report the first O17 NMR studies of a triangular-lattice superconductor Na1/3CoO2·43H2O and the host material NaxCoO2 (x=0.35 and 0.72). Knight shift measurements reveal that p−d hybridization induces sizable spin polarization in the O triangular-lattice layers. Water intercalation makes CoO2 planes homogeneous and enhances low frequency spin fluctuations near Tc=4.5 K at some finite wave vectors different from both the ferromagnetic and “120 degree” modes.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Na1/3CoO2·43H2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.5 | Pressure not reported | unknown |
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