Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-02-06
Europhysics Letters v.85 (2009) p.47006
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages, 5 figures. Accepted at EPL (Europhysics Letters)
Scientific paper
10.1209/0295-5075/85/47006
We report $^{23}$Na and $^{59}$Co nuclear magnetic (NMR) and quadrupolar resonance (NQR) studies for the $x=2/3$ phase of the lamellar oxide Na$_{x}$CoO$_{2}$, which allowed us to establish reliably the atomic order of the Na layers and their stacking between the CoO$_{2}$ slabs. We evidence that the Na$^{+}$ order stabilizes filled non magnetic Co$^{3+}$ ions on 25% of the cobalt sites arranged in a triangular sublattice. The transferred holes are delocalized on the 75% complementary cobalt sites which unexpectedly display a planar cobalt kagom\'{e} structure. These experimental results resolve a puzzling issue by precluding localized moments pictures for the magnetic properties. They establish that the quasi ferromagnetic properties result from a narrow band connecting a frustrated arrangement of atomic orbitals, and open the route to unravel through similar studies the electronic properties of the diverse ordered phases of sodium cobaltates.
Alloul Henri
Dooglav A. V.
Mukhamedshin I. R.
Platova T. A.
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