^{59}Co NMR evidence for charge ordering below T_{CO}\sim 51 K in Na_{0.5}CoO_2

Abstract

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 $T_{CO}\sim 51K$, the insulating ground state of the itinerant antiferromagnet Na${}_{0.5}$CoO${}_2$ ($T_N\sim 86K$) is induced by charge ordering.

Phys. Rev. Lett. 100 (2008), in press. 4 figures

References in corpus (1)

• Magnetic Phase Transition at 88 K in Na0.5CoO2 revealed by 23Na-NMR investigations

Cited by in corpus (1)

• Scalar spin chirality and quantum Hall effect on a triangular lattice