Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-11-26
Phys. Rev. Lett. 100 (2008) 086405
Physics
Condensed Matter
Strongly Correlated Electrons
Phys. Rev. Lett. 100 (2008), in press. 4 figures
Scientific paper
10.1103/PhysRevLett.100.086405
The CoO$_{2}$ layers in sodium-cobaltates Na$_{x}$CoO$_{2}$ may be viewed as a spin $S=1/2$ triangular-lattice doped with charge carriers. The underlying physics of the cobaltates is very similar to that of the high $T_{c}$ cuprates. We will present unequivocal $^{59}$Co NMR evidence that below $T_{CO}\sim51 K$, the insulating ground state of the itinerant antiferromagnet Na$_{0.5}$CoO$_{2}$ ($T_{N}\sim 86 K$) is induced by charge ordering.
Ahilan Kanagasingham
Chou Fang-Chieh
Golin S. M.
Imai Takayuki
Ning F. L.
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