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Na ordering imprints a metallic kagomé lattice onto the Co planes of Na <sub>2/3</sub> CoO <sub>2</sub>
We report 23Na and 59Co nuclear magnetic (NMR) and quadrupolar resonance (NQR) studies for the x=2/3 phase of the lamellar oxide NaxCoO2, which allowed us to establish reliably the atomic order of the Na layers and their stacking between the CoO2 slabs. We evidence that the Na+ order stabilizes filled …