Three-Dimensional Spin Fluctuations in Na0.75CoO2

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dc.creatorHelme, L. M.
dc.creatorBoothroyd, A. T.
dc.creatorColdea, R.
dc.creatorPrabhakaran, D.
dc.creatorTennant, D. A.
dc.creatorHiess, A.
dc.creatorKulda, J.
dc.date2004-10-19
dc.date.accessioned2026-07-07T06:26:06Z
dc.date.available2026-07-07T06:26:06Z
dc.descriptionWe 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 ~12 meV. From a minimal spin wave model, containing only nearest-neighbour Heisenberg exchange interactions, we estimate the inter- and intra-layer 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.
dc.description5 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0410457
dc.identifierhttp://arxiv.org/abs/cond-mat/0410457
dc.identifierPhys. Rev. Lett. 94, 157206 (2005)
dc.identifierdoi:10.1103/PhysRevLett.94.157206
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/97013
dc.subjectStrongly Correlated Electrons
dc.subjectSuperconductivity
dc.titleThree-Dimensional Spin Fluctuations in Na0.75CoO2
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