Journal
PHYSICAL REVIEW LETTERS
Volume 94, Issue 15, Pages -Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.94.157205
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NaxCoO2, the parent compound of the recently synthesized superconductor Na(x)CoO(2)yH(2)O, exhibits bulk antiferromagnetic order below similar to 20 K for 0.75 <= x <= 0.9. We have performed neutron scattering experiments in which we observed Bragg reflections corresponding to A-type antiferromagnetic order in a Na0.82CoO2 single crystal and characterized the corresponding spin-wave dispersions. The spin waves exhibit a strongly energy-dependent linewidth. The in-plane and out-of-plane exchange constants resulting from a fit to a nearest-neighbor Heisenberg model are similar in magnitude, which is unexpected in view of the layered crystal structure of NaxCoO2. Possible implications of these observations are discussed.
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