Three-dimensional spin fluctuations in Na0.75CoO2

L M Helme, A T Boothroyd, R Coldea, D Prabhakaran, D A Tennant, A Hiess, J Kulda

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99 Citations (Scopus)


We report polarized- and unpolarized-neutron scattering measurements of magnetic excitations in single-crystal Na0.75CoO2. The data confirm ferromagnetic correlations within the cobalt layers and reveal antiferromagnetic correlations perpendicular to the layers, consistent with an A-type antiferromagnetic ordering. The magnetic modes propagating perpendicular to the layers are sharp, and reach a maximum energy of similar to 12 meV. From a minimal spin-wave model, containing only nearest-neighbor Heisenberg exchange interactions, we estimate the interlayer and intralayer exchange constants to be 12.2 +/- 0.5 meV and -6 +/- 2 meV, respectively. We conclude that the magnetic fluctuations in Na0.75CoO2 are highly three dimensional.

Original languageEnglish
Number of pages4
JournalPhysical Review Letters
Publication statusPublished - 22 Apr 2005


  • NACO2O4


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