59Co NMR evidence for charge ordering below T_(CO) approximately 51 K in Na0.5CoO2.
The CoO2 layers in NaxCoO2 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 59Co NMR evidence that below T_(CO) approximately 51 K, the insulating ground state of the itinerant antiferromagnet Na0.5CoO2 (T_(N) approximately 86 K) is induced by charge ordering.
Ning
F L
FL
Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada.
Golin
S M
SM
Ahilan
K
K
Imai
T
T
Shu
G J
GJ
Chou
F C
FC